Published online before print April 21, 2008, doi: 10.1161/CIRCULATIONAHA.107.189473
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(Circulation. 2008;117:2407-2423.)
© 2008 American Heart Association, Inc.
AHA Scientific Statement |
Cardiovascular Monitoring of Children and Adolescents With Heart Disease Receiving Medications for Attention Deficit/Hyperactivity Disorder
A Scientific Statement From the American Heart Association Council on Cardiovascular Disease in the Young Congenital Cardiac Defects Committee and the Council on Cardiovascular Nursing
Key Words: AHA Scientific Statements • attention deficit disorder with hyperactivity • cardiovascular monitoring • congenital heart disease • stimulant drugs • death, sudden • heart arrest • pediatrics
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Introduction |
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Top
Introduction
Overview of ADHDOver the past decade, concerns have been raised regarding the safety of a variety of psychotropic medications in children and adolescents, the appropriate selection of patients for therapy, and the indications for cardiovascular monitoring. In 1999, concerns over potential cardiovascular effects of psychotropic drugs, especially tricyclic antidepressants1,2 but including stimulants, prompted the American Heart Association (AHA) scientific statement "Cardiovascular Monitoring of Children and Adolescents Receiving Psychotropic Drugs."3 At that time, no specific cardiovascular monitoring was recommended for the use of stimulant medications. Since that time, a constellation of circumstances have come together, necessitating a second look at this complicated issue. These circumstances include an increased awareness of the presence of attention deficit/hyperactivity disorder (ADHD) in the general population and in children with preexisting cardiac conditions; public concerns about the side effects and toxicities of medications, especially psychotropic medications in children; and regulatory factors and warnings issued by the US Food and Drug Administration (FDA) and by the pharmaceutical industry in response to the FDA. This writing group was convened in response to FDA concerns with regard to the safety of the ADHD drugs and with regard to the identification of children with underlying cardiovascular abnormalities.
At a time when there is much discussion of the side effects of drugs and of the use of psychotropic drugs in children in the media and lay literature, it is particularly important for the medical profession to play a significant role in critically evaluating the use of stimulant medication in children, including those who may have undiagnosed heart disease and those who are known to have heart disease.
The writing group for "Cardiovascular Monitoring of Children and Adolescents With Heart Disease Receiving Medications for Attention Deficit/Hyperactivity Disorder" reviewed the literature relevant to this topic since the last publication of the AHA scientific statement that included these drugs in 1999 to assist the group in their recommendations. Literature searches were conducted in PubMed/MEDLINE databases to identify pertinent articles. The major search terms included stimulant drugs, methylphenidates, amphetamines, sudden cardiac death (SCD), death, arrhythmias, ventricular tachycardia, ADHD, attention deficit disorder, cardiovascular side effects, treatment of ADHD in children, ADHD and stimulant medications, SCD in children and adolescents, methylphenidates and cardiac death, and amphetamines and cardiac death. Searches were limited to the English language from 1980 through August 2007. In addition, related article searches were conducted in MEDLINE to find further relevant articles. The information available on the FDA Web site (www.fda.gov) regarding Advisory Committee meetings was used. Finally, committee members recommended applicable articles outside the scope of the formal searches.
Using the evidence-based methodologies developed by the American College of Cardiology/AHA Task Force on Practice Guidelines, the writing group has given classifications of recommendations and levels of evidence when applicable. The classifications of recommendations and levels of evidence are shown in Table 1.
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A recommendation with level of evidence B or C does not imply that the recommendation is weak. Many important clinical questions addressed in guidelines do not lend themselves to clinical trials. Although randomized trials are not available, there may be a very clear clinical consensus that a particular test or therapy is useful and effective.
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Overview of ADHD |
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Overview of ADHD in the General Population of Children
ADHD, the most common neurobehavioral disorder of childhood, is characterized by developmentally inappropriate levels of hyperactivity, inattention, and impulsivity. Additional defining features include impairment in executive function and behavioral self-regulation.4–6 Prevalence rates of 4% to 12% have been reported in community-based samples of school-aged children in the United States.7–9
Diagnosis
The Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) defines 3 ADHD clinical phenotypes—inattentive, hyperactive-impulsive, and combined—based on symptom count (6 for either inattentive or hyperactive-impulsive and 6 in each category for combined) causing impairment in functioning in at least 2 settings (home, school, social).10 Comorbidity, including oppositional defiant disorder (35%), conduct disorder (30% to 50%), anxiety disorders (25%), mood disorders (15% to 75%), and learning disabilities (25%), also has been reported in clinical samples of ADHD children and adolescents.11–13
Origin and Risk Factors
Investigations into the origin of ADHD have focused on the central nervous system involvement, the genetics of the disorder, and environmental risk factors.14
Central Nervous System Involvement
Converging evidence from neuropsychology, neuroimaging, neuropharmacology, and genetics suggests involvement of the frontostriatal dopaminergic circuits in the brain.14
Genetic Influence in ADHD
Family studies report a higher incidence of ADHD among first-degree family members of ADHD male and female probands.15–18 Faraone et al19 have estimated the heritability of ADHD at 0.76, making ADHD one of the most heritable psychiatric disorders.
Environmental Risk Factors
The concordance rate of 33% in dizygotic twins, double the rate reported in siblings,20 points to environmental risk factors incurred during the prenatal course. Environmental factors that have been most consistently associated with ADHD include maternal smoking during pregnancy,21,22 emotional distress or family adversity during pregnancy and early in life,21,23,24 birth weight <1500 g,24 hypoxemia,25 encephalitis,26 trauma,27 lead exposure,28 and brain injury from some metabolic disorders.29
ADHD in Children With Heart Disease
ADHD may be more prevalent in children with heart disease than in the general pediatric population. Mahle et al30 have reported abnormal attention scores in 45% of children and abnormal hyperactivity scores in 39% of children with heart disease based on the responses of parents and teachers on the DSM-IV Rating Scale and Behavior Assessment System for Children. In this study, more than two thirds of children with hypoplastic left heart syndrome were thought to have attention/hyperactivity problems. In 2004, Kirshbom and colleagues31 found that 50% of children with total anomalous pulmonary venous return displayed abnormal hyperactivity and/or attention deficits. As previously noted, chronic or intermittent hypoxia experienced by children with heart disease has been linked to adverse effects on development, academic achievement, and behavior.25 Congenital cardiovascular anomalies are present in 76% of children with velocardiofacial syndrome/DiGeorge syndrome, caused by 22q11 microdeletion.32 ADHD affects 35% to 55% of these children.33
Impact and Sequelae of ADHD and Risks of Not Treating
ADHD and its associated conditions have a profound impact on individuals, families, and society. Children with ADHD compared with their non-ADHD peers are at high risk for injuries, academic underachievement, and social difficulties such as peer rejection.34–36 These difficulties often persist into adulthood. Individuals with ADHD attain lower occupational status than peers and are at increased risk of developing problems with substance use and antisocial behavior, as well as increased rates of automobile accidents.37–39 Thus, in 1998, the National Institutes of Health consensus panel on the diagnosis and treatment of ADHD concluded that the costs associated with ADHD were large, stating that individuals with ADHD "consume a disproportionate share of resources and attention from the health care system, criminal justice system, schools, and other social service agencies."39a
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History of the Problem Regarding Stimulant Medications |
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Recent Events
A review of the current concerns regarding these medications and recommendations regarding monitoring of those on medications follows.
Health Canada and Adderall XR
In February 2005, Health Canada, the Canadian drug regulatory agency, suspended the sale of Adderall XR in the Canadian market. The Canadian action was based on US postmarketing reports of sudden deaths in pediatric patients. In response to the Health Canada action, the FDA released a "Public Health Advisory for Adderall and Adderall XR," stating that it "had been aware of these post-marketing cases, and evaluated the risk of sudden death with Adderall prior to approving the drug for treatment of ADHD in adults last year."39b The factors potentially associated with these sudden deaths in the FDA Adverse Event Reporting System database included cardiac structural abnormalities such as aberrant origin of coronary artery, idiopathic hypertrophic subaortic stenosis, bicuspid aortic valve, and cardiac hypertrophy. Other factors listed were unexplained increased or toxic amphetamine level, family history of ventricular arrhythmia, and extreme exercise and dehydration. The FDA stated that "the number of cases of sudden deaths reported for Adderall is only slightly greater, per million prescriptions, than the number reported for methylphenidate products, which are also commonly used to treat pediatric patients with ADHD."39b Despite the lack of data to support limiting the use of the stimulant medications in children with heart disease, in August 2005, the FDA added a warning to the Adderall labeling, titled "Sudden Death and Preexisting Structural Cardiac Abnormalities," which states, "Sudden death has been reported in association with amphetamine treatment at usual doses in children with structural cardiac abnormalities. Adderall XR generally should not be used in children or adults with structural cardiac abnormalities."39c Additionally, a boxed warning states, "Misuse of amphetamine may cause sudden death and serious cardiovascular events." Health Canada reinstated the marketing authorization of Adderall XR in Canada effective August 26, 2005, with the stipulation that the drug monograph note the same warning as above.
Other Stimulant Medications and the FDA
In June 2005, at a meeting of the FDA Pediatric Advisory Committee, postmarketing reports regarding methylphenidate products were discussed, raising concerns regarding their cardiac safety. Long-term safety trials and targeted cardiovascular risk studies were mentioned as a potential option to better understand the cardiovascular risks for all drug products approved for ADHD. A review of adverse events of all stimulant products and atomoxetine occurred in early 2006 as described below. The importance of evaluating both methylphenidates and amphetamines, given that both are stimulants, was stated by the FDA "to avoid switching from one class to the other based on incomplete safety assessments."39d Additionally, the FDA stated that it could not determine whether adverse cardiovascular events in patients on methylphenidate-based stimulants were "causally associated with the treatment."39d
On February 9, 2006, the Drug Safety and Risk Management Advisory Committee of the FDA convened to discuss how to research heart risk associated with medications.40 Reports from that conference reflect that between 1999 and 2003, 25 people (19 children) taking ADHD medications died suddenly and 43 people (26 children) experienced cardiovascular events such as strokes, cardiac arrest, and heart palpitations.40 The FDA advisory panel recommended with an 8-to-7 vote that a "black box" warning about possible cardiovascular risks associated with stimulant medications used to treat ADHD be added to the drug labeling. Furthermore, it was recommended that clinicians continue to follow American Academy of Pediatrics guidelines on the assessment and management of ADHD.
The FDA Pediatric Advisory Committee met in March 2006 to review the reports of heart and psychiatric problems associated with ADHD medications.41 Additional data in children from 1992 to February 2005 revealed 11 sudden deaths associated with methylphenidates and 13 associated with amphetamines. Additionally, 3 sudden deaths were reported in children on atomoxetine between 2003 and 2005.41 The Pediatric Advisory Committee did not follow the prior Drug Safety Committee’s recommendations for a black box warning but suggested that this drug information be placed in the "highlights" section of the newly formatted labeling (January 2006) with warnings that "children with structural heart defects, cardiomyopathy, or heart-rhythm disturbances may be at risk for adverse cardiac events, including sudden death." Additionally, the Pediatric Advisory Committee recommended that an informational booklet describing the risks, benefits, and adverse effects of the stimulant medications be developed for parents, families, and providers.
In a recent editorial, concerns were raised about the cardiovascular risks of stimulant drugs used to treat ADHD, supporting a black box warning,42 with subsequent responses and articles suggesting a more tempered view with a weighing of risks and benefits to these children.43,44 Review of the available data suggests that some of the children who died may have had the specific types of cardiac lesions that predispose to SCD. Others who died were not known to have any of these risk factors, but few data are available because these data were provided voluntarily through the FDA Adverse Event Reporting System by a variety of reporters, including parents, doctors, coroners, pharmacists, other health professionals, and media reporters, resulting in possible underreporting or limited reports. Reports of arrhythmias and sudden unexpected death associated with amphetamines are primarily case reports, FDA self-reports with little information, or reports of abuse of amphetamines.45,46 There are no systematically collected data to indicate that "structural heart disease" broadly should be a reason to avoid these medications. Likewise, there are no data to identify the actual risks of stimulant medication in children with congenital heart disease. At the present time, a few epidemiological studies are in progress, but no studies are specifically focused on identifying precise cardiac diagnoses of concern in children with ADHD and exposure to stimulant medications.
On February 21, 2007, the FDA issued a press release titled "FDA Directs ADHD Drug Manufacturers to Notify Patients About Cardiovascular Adverse Events and Psychiatric Adverse Events."46a The press release indicated that "the US Food and Drug Administration (FDA) today directed the manufacturers of all drug products approved for the treatment of Attention Deficit Hyperactivity Disorder (ADHD) to develop Patient Medication Guides to alert patients to possible cardiovascular risks and risks of adverse psychiatric symptoms associated with the medicines, and to advise them of precautions that can be taken." Additionally, the FDA recommended "that children, adolescents, or adults who are being considered for treatment with ADHD drug products work with their physician or other health care professional to develop a treatment plan that includes a careful health history and evaluation of current status, particularly for cardiovascular and psychiatric problems (including assessment for a family history of such problems)." These patient medication guidelines have been developed for 15 medications, including all of the stimulant medications used for ADHD such as amphetamines, methylphenidates, and atomoxetine. All mention the risk of sudden death in patients who have heart problems or heart defects. In the medication guide section titled "Who Should Not Take (Name of Drug),"46b the amphetamine medication guides indicate regarding cardiovascular effects that (name of drug) "should not be taken if you or your child has heart disease or hardening of the arteries or moderate to severe high blood pressure." Further in the section titled "(Name of Drug) May Not Be Right for You or Your Child," the guide instructs that before (name of drug) is started, "tell your or your child’s doctor about all health conditions (or a family history of), including: heart problems, heart defects, high blood pressure." Additional concerns about other noncardiovascular issues are listed in all of the medication guides.
The medication guide for the methylphenidate products includes general information about sudden death and heart problems or heart defects but does not state that individuals with heart disease should not take the product. Rather, the guide includes this information in the section titled "(Name of Drug) May Not Be Right for You or Your Child." It instructs, "Before starting (Name of Drug) tell your or your child’s doctor about all health conditions (or a family history of) including: heart problems, heart defects, high blood pressure."
The atomoxetine medication guide uses wording and placement of the warning about heart problems similar to those of the methylphenidate medication guides. All of these medication guides can be found on the FDA Web site.46b
The drug labels in the specific monographs are similar, and most have a statement that indicates that these "stimulant products generally should not be used in children or adolescents with known serious structural cardiac abnormalities, cardiomyopathy, heart rhythm abnormalities, or other serious cardiac problems that may place them at increased vulnerability to the sympathomimetic effects of a stimulant drug." A few of the labels focus more on hypertension, heart failure, and myocardial infarction, in addition to cardiac arrhythmias.
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Risk of SCD in Children |
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Epidemiology
It is estimated that SCD claims the lives of 1000 to 7000 children and adolescents each year in the United States, accounting for
5% to 10% of all childhood deaths annually, with an incidence of 0.8 to 6.2 per 100 000.47 The exact number is not entirely clear. Clinical experience suggests that SCD can occur not only in the setting of organized sports but also in children and adolescents engaged in many levels of activity or even in the absence of activity. In children and adolescents, SCD usually is associated with cardiomyopathy, primary electrical disease, or congenital heart disease, reflecting the fact that an underlying substrate must be present to place a child or adolescent at risk.
Cause
The most common causes of SCD in the United States are hypertrophic cardiomyopathy (HCM; 33% to 50%); long-QT syndrome (LQTS; 15% to 25%); other cardiomyopathies, including arrhythmogenic right ventricular dysplasia and dilated cardiomyopathy (10% to 20%); coronary artery anomalies (10% to 20%); primary ventricular fibrillation or tachycardia (10% to 15%); Wolff-Parkinson-White syndrome (WPW; 3% to 5%); and others, including aortic rupture (5%).48 HCM has a prevalence of 1 in 500 in the United States, with an incidence of sudden death in children of 2% to 8% per year.49–51 A 12-lead ECG is abnormal in 75% to 95% of patients with HCM.52 In LQTS, 4000 cases of SCD in children and adults in the United States occur each year, often as a result of adrenergic stimulation leading to triggering of ventricular arrhythmias, including the characteristic torsades de pointes, a form of ventricular tachycardia.53 ECG abnormalities are present in 90% of LQTS patients and include prolongation of the corrected QT interval (QTc) with abnormal T-wave morphology. Brugada syndrome, with a prevalence of 1 to 5 in 10 000 in the Western countries, is characterized by findings of right bundle-branch block and ST-segment elevation in the precordial leads and syncope or aborted SCD; the risk of ventricular fibrillation or SCD over a 3-year follow-up period was shown to be 40%.54 WPW syndrome is the most common form of ventricular preexcitation with a prevalence of the WPW pattern on ECG of 1 to 3 in 1000. WPW can result in SCD because of rapid conduction of atrial fibrillation down the accessory pathway resulting in ventricular fibrillation.55 Other causes of SCD include congenital anomalies of the coronary arteries, arrhythmogenic right ventricular dysplasia, other cardiomyopathies and myocarditis, Marfan syndrome, short-QT syndrome, commotio cordis, and pulmonary hypertension.
Risks of Arrhythmia and SCD in Children With Operated Congenital Heart Disease
All patients who undergo cardiac surgery are at risk for developing cardiac arrhythmias.56 The correction of specific defects predisposes the patient to the development of specific types of abnormal cardiac rhythms, which include supraventricular tachycardia, atrial flutter or fibrillation, ectopic atrial tachycardia, sick sinus syndrome, ventricular tachycardia, atrioventricular block, and sudden death. Cardiac arrhythmias result in significant morbidity in these congenital heart disease patients with an incidence of sudden death of 2% to 10%. The incidence of postoperative arrhythmias varies from 3% to 85% (Table 2).57
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Prevention of SCD |
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Secondary Prevention
Regardless of the initial cause, the event leading to SCD in children and adolescents is increasingly recognized to involve unstable ventricular rhythms; the only life-saving treatment is rapid defibrillation.58 For each minute that passes without defibrillation, survival decreases 10%. After the deaths of several high profile athletes and schoolchildren in many communities in recent years, both private programs and legislation have been initiated to provide for automated external defibrillators in public places, including school systems. Studies demonstrating ease of use have shown that trained sixth graders are able to operate the device correctly.59 When defibrillators are more readily available, time to defibrillation may be reduced and survival rates improved.
Primary Prevention
Although rapid defibrillation may be an effective treatment for many children, it is still unclear how best to identify those children at risk for SCD through primary screening.60 Identification would allow early intervention to decrease the risk of SCD.
Universal ECG Screening
ECG screening on a large scale has been implemented successfully in other countries.
ECG Screening in Japan
Since 1973, mass screening of schoolchildren for cardiovascular disease has been mandatory in Japan.61 The greater sensitivity of ECG screening compared with history and physical examination has been documented in studies of Japanese schoolchildren. In a study of 120 000 schoolchildren from 1980 to 1984, cardiovascular disease was detected in 78 children. ECG was more sensitive than history or physical examination in identifying abnormalities.62 In another study from 1994 to 1996, 0.1% of Japanese schoolchildren (100 of 92 000) were identified as having WPW.63
ECG Screening of Athletes in Italy and Europe
In Italy, screening of all athletes participating in organized sports has been mandated for >30 years by the Italian government under the Medical Protection of Athletic Activities Act. From 1979 to 1996, 33 735 athletes <35 years of age were screened. A total of 621 athletes were disqualified from competition because of cardiovascular conditions, including 22 athletes with HCM.64 Interestingly, in 1998, the rate of SCD resulting from HCM was reported to be lower in Italy than in the United States, although the overall incidence was the same.64 In the Italian preparticipation study, the ECG had a 77% greater power to detect HCM than the history and physical examination alone.64 Recent publications from the Italian athletic preparticipation program indicate that the incidence of SCD in athletes, especially resulting from cardiomyopathies, has significantly decreased. Evaluation of 42 386 athletes between 1979 and 2004 (12 to 35 years of age) who underwent the Italian screening (ECG, examination, and echocardiogram if the ECG or examination was abnormal) showed that the annual incidence of SCD in athletes decreased by 89% (from 3.6 to 0.4 in 1000 person-years). Only 2% of athletes were disqualified.65
Another study looked at the efficacy of the screening program in identifying HCM by performing echocardiograms on 4450 athletes who were designated as normal and qualified to participate in athletic activities a mean of 5 months after the qualifying screening. The echocardiogram was normal in this group who had been cleared by ECG and examination 98.8% of the time.66
A 2005 consensus statement from the European Society of Cardiology on cardiovascular preparticipation screening of young competitive athletes recommends a common European screening program for young athletes based on the 12-lead ECG.67
ECG Screening of Newborns in Italy
In addition to the screening program for athletes, Italy has recently initiated a newborn ECG screening program and has identified infants with conditions predisposing them to SCD. In 1998, a report of >33 000 neonates found that half of the 24 infants in that study who died of sudden infant death syndrome had a QTc of >0.44 seconds with 4 having intervals 
0.46 seconds. Prolongation of the QT interval was thought to be strongly associated with sudden infant death syndrome.68 The most recent reported data from the Italian neonatal screening program showed an incidence of prolonged QTc >0.47 seconds in 0.7% and an identified long-QT mutation in half of these.69 Although this initial article raised a great deal of controversy, subsequent molecular genetic studies have shown that 10% of sudden infant death syndrome cases have functionally significant genetic variants in LQTS genes.70
International Olympic Committee Recommendations on Preparticipation Athletic Screening
On December 10, 2004, the International Olympic Committee Medical Commission issued a protocol for cardiovascular screening of athletes.71 This included a personal history questionnaire, a family history questionnaire, a physical examination, and a 12-lead ECG.
Athletic Screening in the United States: Preparticipation History and Physical Examination
The preparticipation history and physical examination for those involved in athletics are the primary screening tools currently used in the United States. Despite AHA recommendations in 1996,72 screening by history and physical examination is limited by inconsistencies in personnel and forms used across states. In 1998, a study found that 40% of states had inadequate history and physical examination screening, having no approved history and physical examination questionnaire, no formal screening requirement, or forms judged to be inadequate.73 Screening athletes only misses the >25 million schoolchildren per year who do not participate in sports. In the portion of school student athletes screened, the type of screening is inadequate nearly half of the time. Furthermore, concerns have been raised over the low sensitivity and cost-effectiveness of the preparticipation history and physical examination.75
AHA Statement on Preparticipation Screening in Athletes: 2007 Update Regarding ECG Screening
In response to the recently published Italian screening studies and the European Society of Cardiology and International Olympic Committee recommendations that an ECG be included in preparticipation athletic screening, the AHA Nutrition, Physical Activity, and Metabolism Council issued a new AHA Scientific Statement.76 This new statement, an update of the 1996 AHA preparticipation screening scientific statement, indicates that the panel "addresses the benefits and limitations of the screening process for early detection of cardiovascular abnormalities in competitive athletes, cost-effectiveness and feasibility issues, and relevant medical-legal implications." The new recommendations are virtually unchanged from the 1996 recommendations and include the 12 elements of the preparticipation screening evaluation with personal and family medical history and physical examination. Studies using these standards from the 1996 statement have shown that 17% of those surveyed included all of the elements in their preparticipation screening.77 The European Society of Cardiology and International Olympic Committee model is noted in this AHA statement to be "a benevolent and admirable proposal deserving of serious consideration" but "impractical and not applicable" to the American system because of the financial resources, manpower, and logistics required for a national screening program. It is stated that "the panel does not arbitrarily oppose volunteer-based athlete screening programs with noninvasive testing performed selectively on a smaller scale in local communities, if well designed and prudently implemented. The use of ECG screening in professional athletes, now mandated by the NBA [National Basketball Association], is noted."
ECG Screening of Nevada High School Athletes
In a study of 5615 young athletes in Nevada, the sensitivity of the ECG in identifying serious cardiovascular abnormalities was 73% versus 4.5% for history and physical examination.78 Specificity was comparable with the 2 screening methods at 95%. Concern for low specificity of ECG screening centers on the fact that many highly trained athletes develop remodeling of the left ventricle that manifests in ECG changes.79–81 One reason for the higher specificity found in the Nevada study is that high school athletes are not as highly trained and have not had left ventricular remodeling to the extent of the Olympic and college athletes in other studies.79 In the Nevada study, 2.3% of patients screened (130 of 5615) had ECG changes of concern for HCM. All of these patients had normal blood pressure and subsequent normal echocardiogram. They were all judged to have an "athletic heart," and none were disqualified from competition.78 Overall, only 0.4% of high school athletes in this study (22 of 5615) were disqualified from competition, all of whom had cardiovascular abnormalities that precluded participation based on Bethesda Conference guidelines for sports participation.82 Low specificity resulting from false positives from "athlete heart syndrome" should be even less of a concern when screening the general population of schoolchildren. Smaller studies focusing on screening athletes have detected few potentially lethal cardiovascular abnormalities. However, they have not been powered to do so, with the largest study including just over 5000 high school athletes.78 Screening for SCD with ECG has been shown to be more sensitive than history and physical examination.
Echocardiographic Screening of Junior High Students
Interestingly, a study of 357 healthy junior high students identified previously unknown cardiac defects in 3.6% of children using echocardiographic screening.83 Two patients required interventional cardiac catheterization, and 1 patient underwent open heart surgery. The echocardiogram was more sensitive in detecting cardiac abnormalities than a physical examination performed by a pediatrician or cardiologist; ECG data were not published in this study.
Measurement of the QT Interval and Predictive Value
The precise value of an abnormal QTc is difficult to ascertain from the literature and has evolved over time, as have the methods of measuring and correcting QT intervals. Six methods have been proposed,84,85 and a recent article by experts in the field has suggested normal QTc values. A Bazett-corrected QT interval >460 ms on ECG was stated to be prolonged in a study of 158 children. In a recent publication, abnormal values were >450 ms for adult men, >470 ms for women, and >460 ms for 1- to 15-year-olds.86 QTc intervals of 0.47 second in male subjects and 0.48 seconds in female subjects were completely predictive but resulted in false-negative diagnoses in 40% of the male and 20% of the female subjects in a study of carriers of long-QT genes.87 Because there are no large population studies of QTc intervals in children at the present time correlating QTc intervals with a definitive genetic diagnosis of LQTS, the predictive value of the ECG for LQTS in the general population is not known. However, there are no data to suggest that it would not be as valuable in the child previously unknown to have LQTS as it is in the child with a definitive genetic diagnosis. Up to 15% to 20% of individuals with long-QT mutations have been shown to have normal QTc intervals on an ECG, and serial ECGs have been shown to be more diagnostic than a single ECG.87,88
Cost-Effectiveness of ECG Screening
ECG screening has been shown to be more cost-effective than history and physical examination, with an estimated cost of $44 000 versus $84 000 per year of life saved.75 These data come from the Nevada study of high school athletes and include the cost of further testing necessary after identification of a possible abnormality by the initial screening test. In the Nevada study, 10% of athletes (582 of 5615) underwent an echocardiogram to further investigate abnormalities in history, physical examination, or ECG.78 Analysis of data from the neonatal screening program in Italy indicated that this type of program was highly cost-effective, with the cost per year of life saved being 20 400 euros.89 A published response to this article questioned the applicability of the calculations to the US medical system.90
Screening in the United States
Although the current literature suggests that screening for SCD with ECG may be more effective than the current system in place in the United States, a large-scale screening program has not been implemented or tested to date. Screening is being done by industry and grass roots groups but without a systematic protocol or follow-up in many instances. Some screenings include ECG, some include echocardiography, and some include both.
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Pharmacotherapy of ADHD |
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Mechanisms of Action of Pharmacotherapy
Medications approved by the FDA for the management of ADHD include immediate-release and long-acting, extended-release methylphenidate and amphetamine preparations, as well as atomoxetine (Strattera)91 (Table 3).
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Additional information on these drugs can be found in several excellent reviews and reports.92–95 Methylphenidate and amphetamine compounds, which are stimulant medications, release and/or inhibit reuptake of catecholamines (eg, dopamine and norepinephrine), increasing the level of these neurotransmitters at the synapse,94 whereas atomoxetine is predominantly a selective norepinephrine reuptake inhibitor.
Efficacy
The efficacy of these compounds has been widely studied and confirmed.92,95–100 Response rates of >70% have been reported for both methylphenidate and dextroamphetamine compared with 12% for placebo.101,102 There are no studies of efficacy in children with congenital or acquired heart disease.
General Side Effects of Stimulant Drugs
The common side effects of stimulant medications include decreased appetite, insomnia, emotional lability, stomachaches, and headaches. These side effects appear to be similar during short-term treatment (4 weeks)101–104 and long-term maintenance.100,105
Safety of Stimulant Drugs in Children
Data from multisite clinical trials of both amphetamine- and methylphenidate-based stimulants indicate that these medications are generally safe for healthy children with ADHD.103–105 Several studies report that nearly 90% of children will experience at least 1 side effect, but the majority are mild (63% to 69%) or moderate (28% to 34%), with 4% reporting severe side effects and with a 15% withdrawal rate from the study.103,104 Decreased growth rate after long-term stimulant treatment also was highlighted in the naturalistic follow-up of children participating in the Multimodal ADHD study.106
General Cardiovascular Side Effects of Stimulant Drugs
On average, there is an increase in heart rate of 1 to 2 bpm and an increase in systolic and diastolic blood pressures of 3 to 4 mm Hg.107 Ambulatory 24-hour blood pressure monitoring has shown similar increases.108
In general, these cardiac side effects have been thought to be clinically insignificant for most children with ADHD, but there may be a potential for severe adverse events in some children with certain forms of congenital heart disease or arrhythmias with a predisposition for sudden cardiac arrest.48 No study has demonstrated a significant change in the QT or QTc intervals,109 although 1 study showed 1 case of QT prolongation interval >25% with no clinically significant prolongation of the mean QT interval.110
Efficacy and Safety of Stimulants in Children With Heart Disease (Structural Cardiac Abnormalities or Other Cardiac Conditions)
There is 1 report of a small open-label study of methylphenidate in 12 children with velocardiofacial syndrome, two thirds with congenital heart disease. This small group of patients showed a significant improvement in this 4-week study, and none had hypertension, tachycardia, or ECG changes.33 In this small group, these medications in children with heart disease did not cause any harmful effects. On the other hand, there has been a general concern that stimulant drugs have the potential to cause hypertension, tachycardia, or arrhythmias that would be deleterious in children with congenital or acquired heart disease, cardiac arrhythmias, or Marfan syndrome. Additionally, stimulant medications can affect other factors of concern in children with congenital heart disease such as growth, bowel physiology, cardiac arrhythmias, and cardiac function.95,101–105
Cardiac Effects of Specific Drugs
Methylphenidates (Concerta, Focalin, Metadate, Methylin, Ritalin)
Methylphenidate has statistically significant but clinically insignificant hemodynamic effects given in therapeutic doses. Reports of sudden deaths directly related to methylphenidate as the sole agent are rare, but there are reports of ventricular arrhythmias and suppression of cardiac function with methylphenidate abuse.45,111,112
Amphetamines (Adderall, Dexedrine): Electrophysiological Effects of Amphetamines
Amphetamines have been associated with tachyarrhythmias and sudden death.113–115 Many of the electrophysiological effects of amphetamines may be initiated by the release of norepinephrine stores from presynaptic vesicles and blocking of norepinephrine reuptake.116,117 In addition, amphetamines are potent blockers of dopamine uptake and strong central nervous system stimulants.
Dopaminergic Effects of Amphetamines
In addition to the β-agonist effects of amphetamines, the dopamine receptors D1 and D2 contribute to the cardiovascular effects of methamphetamine by producing a pressor response accounting for the increase in blood pressure. The D1 receptor also is involved in mediating the positive tachycardic effects of methamphetamine.117 Methamphetamine has been shown to increase ventricular wall stress by increasing afterload.118 This results in an increase in myocardial oxygen demand.
Amphetamine Abuse
The abuse of amphetamines is compounded by the multiple synthetic forms of amphetamine available and the relative ease of production.119 In addition, the purity of the form of substance taken, route of administration, and abuse of >1 compound (eg, alcohol and methamphetamine) can influence the clinical effects.120 Myocardial hypertrophy, endocardial thickening, myocardial injury, and cardiomyopathy have been demonstrated in regular abusers of methamphetamine.115,116,121
Other Medications Approved for ADHD
Strattera (Atomoxetine)
Short-term studies of atomoxetine found a small but statistically significant increase in mean systolic blood pressure in adults and a marginal increase in diastolic blood pressure in adults and children, which decreased on discontinuation.122 No ECG changes, including QT prolongation, were noted for all ages. Nonsignificant increases in pulse and blood pressure were found after 1 year of treatment.122 Mean change in heart rate was higher in poor CYP2D6 metabolizers. Sudden deaths have occurred in children taking atomoxetine, but extensive details are not available.41
Other Pharmacological Treatment of ADHD
A medication shown to be effective for which FDA approval for ADHD is being sought is guanfacine (Tenex).123 Slight decreases in blood pressure and pulse that are not statistically or clinically significant and no ECG changes have been reported for guanfacine.123,125
Medications shown to have efficacy and to be used clinically but not FDA approved for ADHD include clonidine126,127 and bupropion (Wellbutrin).128,129 Bradycardia and decreased blood pressure have been reported in children treated with clonidine130 but not in adults131 or in children with Tourette’s disorder.132 Elevations in systolic and diastolic blood pressure were noted with abrupt withdrawal of clonidine but not with gradual titration.133,134 ADHD studies in children have shown no significant ECG or vital sign changes with bupropion,135 whereas significant increases in systolic and diastolic blood pressures have been reported in ADHD adults.136 No significant cardiovascular effects have been reported in healthy volunteers,137 although cardiovascular changes have been noted in patients with major depression. In a prospective safety surveillance study of 3100 patients treated with sustained-release bupropion for major depression, 3 patients, each with a preexisting cardiovascular pathology, suffered a myocardial infarction, 2 resulting in death.138 Tachycardia, hypertension, and increased QTc have been reported in overdoses. The uncorrected QT interval did not differ from that of controls, suggesting that the prolonged QTc probably is not due to cardiac toxicity but may be an overcorrection resulting from the tachycardia.139
Effective agents with limited clinical use because of serious adverse effects include the tricyclic antidepressants,140 limited by reports of sudden death,1,141 and monoamine-oxidase inhibitors,142 limited by risk of hypertensive crises. Tricyclics have been reported to cause tachycardia, heart block, orthostatic hypotension, and atrial and ventricular arrhythmias.143 Several cases of sudden death have been reported in children treated with tricyclic antidepressants. One case of a 6-year-old girl treated with imipramine for social phobia at high doses without ECG monitoring was attributed to possible toxicity.144 Since 1990, there have been several reported cases of sudden death in children treated with tricyclic antidepressants that were not attributed to overdose and were presumed to be due to cardiac abnormalities.46,141 At this time, tricyclics are rarely used for the management of ADHD. Although cardiac monitoring is recommended, it is unclear whether monitoring can prevent a catastrophic event. An ongoing large-scale epidemiological study to assess the risk of tricyclic antidepressants may provide more information in the future.
Combination Therapy of Clonidine and Stimulants or Antidepressants
Combining clonidine and stimulants is a common clinical practice frequently used to treat ADHD with comorbid oppositional defiant, conduct disorder, tics, and insomnia.130,145,146 There are spontaneous reports of sudden death in 4 children treated with the combination of methylphenidate and clonidine in 1995.147 It has been hypothesized that the cardiovascular effect could have been triggered by the pharmacodynamic interaction between methylphenidate and clonidine, specifically occurring when peak effects of clonidine (sedation-hypotension-bradycardia) coincided with the wearing off of methylphenidate or vice versa (peak methylphenidate effect resulting in activation-hypertension-tachycardia).127
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Patient Selection for Pharmacotherapy |
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Medication treatment of ADHD should be limited to individuals meeting diagnostic criteria delineated in the DSM-IV text revision (American Psychiatric Association, 2000). Optimal management of ADHD is achieved with multimodal interventions that can include pharmacotherapy, behavioral therapy, and psychoeducational interventions. Although both stimulant medication and behavioral therapy have been shown to improve symptoms in children with ADHD,148 the National Institute of Mental Health–funded multisite trial comparing pharmacological and an intensive behavioral treatment for ADHD found that parent and teacher ratings of ADHD symptoms improved significantly more for children on stimulant medication than with an intensive behavioral treatment (MTA Cooperative Group, 1999).
Thus, for most children with ADHD, it has been recommended that stimulant medication should be used as an important component of the treatment plan.149
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Assessment of Patients for Potential Use of Stimulant Medications |
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We would agree with the conclusion of a recent special article in Pediatrics that states that "there does not seem to be compelling findings of a medication-specific risk necessitating changes in our stimulant treatment of children and adolescents with ADHD."150 Although those authors suggest that the "use of existing guidelines on the use of stimulants (and psychotropic agents) may identify children, adolescents and adults who are vulnerable to sudden death," we offer the following recommendations as a refinement of these previous guidelines to aid in the identification of children who are potentially at an increased risk from any type of increased stimulation.
Rationale for Recommendations
The recent FDA press release and requirements for specific heart-related labeling and medication guides leaves the physician with a variety of dilemmas, including the following regarding individuals diagnosed with ADHD in whom stimulant medications would otherwise be prescribed:
- How to know if the child has heart disease or a heart problem or heart defect.
- What to do if the child is known to have heart disease, a heart problem, or a heart defect.
- What to do if the child has heart disease, a heart problem, or a heart defect known to be associated with SCD.
Our intention is to provide the physician with some tools to help identify these children and make determinations about the use of stimulant medications and the follow-up of children on these medications. The goal is to allow treatment of this very significant problem of ADHD while attempting to lower the risk of these products. We acknowledge that the current level of knowledge about these drugs and the specific risks they may impose on children with "heart problems" is limited at this time. However, the benefit of these stimulant drugs in carefully selected individuals has clearly been shown to be highly efficacious.
Screening for Causes of SCD
A combination of careful history, including the patient’s medical history, family history, ECG, echocardiograms, and cardiac MRI, may be used to identify the causes of SCD in children, including many of the entities described in the section on SCD in children. The use of ECG and echocardiography as a mass screening tool is controversial and is being debated in terms of both efficacy and cost-effectiveness. European studies have shown the efficacy of an ECG-based screening program in athletes in decreasing the incidence of SCD.67 Pilot studies are currently underway in the United States to evaluate the efficacy of screening children for SCD.
Recommendations for Assessment
The various stimulant medications carry warnings in their drug monographs suggesting that these medications generally should not be used in children with "serious structural cardiac abnormalities, cardiomyopathy, heart rhythm abnormalities, or other serious cardiac problems that may place them at increased vulnerability to the sympathomimetic effects of a stimulant drug." Our recommendations stated below are the consensus of the authors and the Council on Cardiovascular Disease in the Young leadership as to the best methods currently available to identify at-risk children before giving them medication and to monitor them safely if stimulant medication is needed to treat their ADHD. They are not intended to limit the appropriate use of stimulants in children with ADHD, to label children with heart disease, or to limit their participation in athletic activities but to add clarity to who has or does not have heart disease and the extent of the risk.
Given the rare association of SCD in those presumed to be predisposed (ie, those with structural cardiac disease as stated in the various drug monographs of stimulant drugs) and in light of the recent FDA advisory panel reports, we recommend the following. After a diagnosis of ADHD has been made but before therapy with a stimulant or other medication is initiated, a thorough evaluation should be performed as indicated below with special attention to symptoms that can indicate a cardiac condition such as palpitations, near syncope, or syncope. All additional medications used, including prescribed and over-the-counter medications, should be determined, and a complete family history should be obtained, especially for conditions known to be associated with SCD, including HCM, LQTS, WPW, and Marfan syndrome. Detection of these symptoms or conditions should warrant an evaluation by a pediatric cardiologist before initiation of therapy. A thorough physical examination for hypertension, cardiac murmurs, physical findings associated with Marfan syndrome, and signs of irregular rhythms should be conducted. Some of the cardiac conditions associated with SCD might not be detected on a routine physical examination. Therefore, it can be useful to add an ECG, which may increase the likelihood of identifying significant cardiac conditions such as HCM, LQTS, and WPW that are known to be associated with sudden cardiac arrest.48 We recognize that the ECG cannot identify all children with these conditions but will increase the probability.
In 2003, 2.5 million children took medications for ADHD.151 The number of children who will potentially need to be screened initially will be much greater than those on a continuing or yearly basis.
- Patient and family history (class I, level of evidence C). The patient history should include questions to elicit the following:
- History of fainting or dizziness (particularly with exercise).
- Seizures.
- Rheumatic fever.
- Chest pain or shortness of breath with exercise.
- Unexplained, noticeable change in exercise tolerance.
- Palpitations, increased heart rate, or extra or skipped heart beats.
- History of high blood pressure.
- History of heart murmur other than innocent or functional murmur or history of other heart problems.
- Intercurrent viral illness with chest pains or palpitations.
- Current medications (prescribed and over the counter).
- Health supplements (nonprescribed).
The family history should include questions to elicit family history of any of the following:- Sudden or unexplained death in someone young.
- SCD or "heart attack" in members <35 years of age.
- Sudden death during exercise.
- Cardiac arrhythmias.
- HCM or other cardiomyopathy, including dilated cardiomyopathy and right ventricular cardiomyopathy (right ventricular dysplasia).
- LQTS, short-QT syndrome, or Brugada syndrome.
- WPW or similar abnormal rhythm conditions.
- Event requiring resuscitation in young members (<35 years of age), including syncope requiring resuscitation.
- Marfan syndrome.
- History of fainting or dizziness (particularly with exercise).
- Physical examination (class I, level of evidence C). The physical examination should include an evaluation of the child for the presence of the following:
- Abnormal heart murmur.
- Other cardiovascular abnormalities, including hypertension and irregular or rapid heart rhythm.
- Physical findings suggestive of Marfan syndrome.
- Abnormal heart murmur.
- ECG (class IIa, level of evidence C). A baseline ECG, which often can identify cardiovascular abnormalities (eg, HCM, LQTS, and WPW anomaly), is reasonable to obtain. It is acknowledged that an ECG will not identify all individuals with the cardiac conditions noted above. It can be useful and can increase the sensitivity of the evaluation, especially if there are suspicions of high-risk conditions.
If possible, ECGs should be read by a pediatric cardiologist or a cardiologist or physician with expertise in reading pediatric electrocardiograms.
Once medication is started, if the initial ECG was obtained before the child was 12 years of age, developmental factors associated with puberty may warrant consideration of a repeat ECG. A similar situation is the development of new symptoms or a change in family history after the initial ECG was obtained, in which case a repeat ECG may be useful (class IIa, level of evidence C).
- Pediatric cardiology consult (class 1, level of evidence C). A consultation from a pediatric cardiologist should be obtained before the stimulant medication is started if there are any significant findings on physical examination, ECG, or history (such as known structural heart disease, arrhythmias, or a family history of SCD in members <35 years of age).
Table 4 lists significant ECG findings for which a cardiology consult would be recommended.
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Recommendations for Administration of Medications and Monitoring |
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The consensus of the committee is that it is reasonable to obtain ECGs as part of the evaluation of children being considered for stimulant drug therapy. We recognize that there are no clinical trials to inform us on this topic and that there is variance in opinion on this topic. There are no widely accepted recommendations or standards of care for cardiac monitoring on stimulant medications. It is not known if the risk of SCD on stimulants is higher than in the general population or that the approach described will decrease the risk. However, the recent information and warnings regarding cardiac disease warrant reconsideration of the previous approach and thus the recommendations noted in this statement.
Continuing Assessment
Recommendations for Cardiovascular Monitoring of Patients on Specific Drugs
- Continuing assessment of patients should be made by the pediatrician at each visit by physical examination and by questions regarding potential cardiac symptoms and new family history. Findings should be noted in the history (class I, level of evidence C).
- Blood pressure and pulse should be evaluated during routine follow-up within 1 to 3 months and at follow-up visits every 6 to 12 months for all medications and more frequently during titration and weaning of the
-agonists (class I, level of evidence C).
- Any cardiac symptoms should result in appropriate referral and testing to determine whether any serious cardiac side effects are present (class I, level of evidence C).
- Patient monitoring for specific drugs both before and after stimulant drugs are started is shown in Table 3.
Recommendations for Cardiovascular Monitoring of Patients With Structural Heart Disease or Other Heart Conditions
- Although concerns have been raised in the drug monographs regarding all individuals with structural heart disease, there are no clinical studies or data indicating that children with most types of congenital heart disease are at significant risk for SCD while on these medications. It is reasonable to consider the use of stimulant medication in patients with congenital heart disease that is not repaired or repaired but without current hemodynamic or arrhythmic concerns or congenital heart disease that is considered to be stable by the patient’s pediatric cardiologist unless the patient’s pediatric cardiologist has specific concerns (class IIa, level of evidence C).
- It is reasonable to use stimulants with caution in the following groups of patients (A through G) after other methods of treatment for ADHD have been considered or used (class IIa, level of evidence C).
- Careful monitoring should be performed after initiation of stimulant medications in the following groups (A through G) (class I, level of evidence C).
- A. Heart condition associated with SCD (LQTS, short-QT syndrome, HCM, arrhythmogenic right ventricular dysplasia, Brugada, coronary anomaly, WPW, Marfan syndrome).
- B. History of an arrhythmia requiring cardiopulmonary resuscitation, direct current cardioversion or defibrillation, or overdrive pacing.
- C. History of an arrhythmia associated with death or SCD.
- D. Previous aborted SCD.
- E. Other clinically significant arrhythmia not treated or controlled.
- F. QTc on ECG >0.46 seconds.
- G. Heart rate or blood pressure >2 SD above means for age.
- B. History of an arrhythmia requiring cardiopulmonary resuscitation, direct current cardioversion or defibrillation, or overdrive pacing.
- A. Heart condition associated with SCD (LQTS, short-QT syndrome, HCM, arrhythmogenic right ventricular dysplasia, Brugada, coronary anomaly, WPW, Marfan syndrome).
- If any of the above conditions or arrhythmias are diagnosed during treatment, consideration should be given to discontinuation of the stimulant medication until further testing and treatment can be achieved (class I, level of evidence C).
- If arrhythmias are treated and controlled, on approval of a pediatric cardiologist, the patient can be restarted on medication (class I, level of evidence C).
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Patients Currently Taking ADHD Medications |
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For children already taking methylphenidate, amphetamine, or other stimulant agents, it is reasonable to obtain a history, review the physical examination, and order an ECG if these were not previously done as outlined above if deemed necessary (class IIa, level of evidence C).
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Evaluation of Risks and Alternatives |
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Evaluate with the family and other treating physicians as appropriate the risks and alternatives to taking the medication, including the often very significant risks associated with not taking the medication (class I, level of evidence C).
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Need for Future Studies |
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Future studies are necessary to assess the true risk of SCD in association with stimulant drugs in children and adolescents with and without heart disease. A registry, discussed below, would be useful in gathering data on a larger, organized scale. Randomized, double-blind, placebo-controlled studies should be considered. However, the multiplicity of medications used to treat ADHD, the difficulty in the design of such studies considering the complexities of the multiple cardiac diagnoses that exist, the number of patients necessary to provide the statistical power to perform such a study, and the ethics of such a study or studies may make this approach challenging.
Further study is needed to determine the efficacy of universal ECG testing at 1 point during childhood to identify children with undiagnosed congenital heart disease and those children with conditions that could lead to sudden cardiac arrest.
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Need for an SCD Registry |
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Considerable interest exists with regard to the establishment of a registry for SCD for children, adolescents, and young adults. The Centers for Disease Control and Prevention attempted an analysis of such data.152,153 That analysis was driven by International Classification of Diseases diagnostic codes and was divided by age group and by inpatient and outpatient setting. Because of the techniques of the analysis, the data were limited, and the incidence of SCD may have been overestimated. To be effective and feasible, an SCD registry should be comprehensive and cross disciplines; it should be extremely detailed for each episode of SCD recorded. For example, useful information from any episode of SCD should include a detailed history of the circumstances of the event, including all medications taken prior to the SCD event, family history, antecedent history, preparticipation screening if it occurred, autopsy results, review by an experienced congenital cardiac pathologist, and postmortem molecular genetic testing of both the index case and first-degree family members if appropriate. Such a registry, even if comprehensively maintained over a short period of time, would allow a more accurate understanding of many questions related to SCD, including the potential association of stimulant drugs and SCD. Other questions such as the true incidence of SCD in children and adolescents and the efficacy of preparticipation screening questionnaires could be answered. In summary, a large-scale, comprehensive registry has the potential to answer many questions that relate to SCD in children, adolescents, and young adults.
For additional information on ADHD medications and SCD, visit the FDA (www.fda.gov) and American Academy of Child and Adolescent Psychiatry (www.aacap.org) Web sites.
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Acknowledgments |
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Disclosures
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Footnotes |
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The American Heart Association makes every effort to avoid any actual or potential conflicts of interest that may arise as a result of an outside relationship or a personal, professional, or business interest of a member of the writing panel. Specifically, all members of the writing group are required to complete and submit a Disclosure Questionnaire showing all such relationships that might be perceived as real or potential conflicts of interest.
This statement was approved by the American Heart Association Science Advisory and Coordinating Committee on March 3, 2008. A single reprint is available by calling 800-242-8721 (US only) or by writing the American Heart Association, Public Information, 7272 Greenville Ave, Dallas, TX 75231-4596. Ask for reprint No. 71-0448. A copy of the statement is also available at http://www.americanheart.org/presenter.jhtml?identifier=3003999 by selecting either the "topic list" link or the "chronological list" link. To purchase additional reprints, call 843-216-2533 or e-mail kelle.ramsay@wolterskluwer.com.
Expert peer review of AHA Scientific Statements is conducted at the AHA National Center. For more on AHA statements and guidelines development, visit http://www.americanheart.org/presenter.jhtml?identifier=3023366.
Permissions: Multiple copies, modification, alteration, enhancement, and/or distribution of this document are not permitted without the express permission of the American Heart Association. Instructions for obtaining permission are located at http://www.americanheart.org/presenter.jhtml?identifier=4431. A link to the "Permission Request Form" appears on the right side of the page.
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References |
|---|
1. Biederman J, Thisted RA, Greenhill LL, Ryan ND. Estimation of the association between desipramine and the risk for sudden death in 5- to 14-year-old children. J Clin Psychiatry. 1995; 56: 87–93.[Medline] [Order article via Infotrieve]
2. Biederman J, Gastfriend D, Jellinek MS, Goldblatt A. Cardiovascular effects of desipramine in children and adolescents with attention deficit disorder. J Pediatr. 1985; 106: 1017–1020.[CrossRef][Medline] [Order article via Infotrieve]
3. Gutgesell H, Atkins D, Barst R, Buck M, Franklin W, Humes R, Ringel R, Shaddy R, Taubert KA. Cardiovascular monitoring of children and adolescents receiving psychotropic drugs: a statement for healthcare professionals from the Committee on Congenital Cardiac Defects, Council on Cardiovascular Disease in the Young, American Heart Association. Circulation. 1999; 99: 979–982.
4. Abikoff H, Gallagher R, Ma J. Measuring and treating organizational, time management and planning deficits in children with ADHD. J Child Adolesc Psychopharmacol. 2003; 13: 422–423.
5. Castellanos FX, Tannock R. Neuroscience of attention-deficit/hyperactivity disorder: the search for endophenotypes. Nat Rev Neurosci. 2002; 3: 617–628.[Medline] [Order article via Infotrieve]
6. Pennington BF, Ozonoff S. Executive functions and developmental psychopathology. J Child Psychol Psychiatry. 1996; 37: 51–87.[Medline] [Order article via Infotrieve]
7. Barbaresi WJ, Katusic SK, Colligan RC, Pankratz VS, Weaver AL, Weber KJ, Mrazek DA, Jacobsen SJ. How common is attention-deficit/hyperactivity disorder? Incidence in a population-based birth cohort in Rochester, Minn. Arch Pediatr Adolesc Med. 2002; 156: 217–224.
8. Brown RT, Freeman WS, Perrin JM, Stein MT, Amler RW, Feldman HM, Pierce K, Wolraich ML. Prevalence and assessment of attention-deficit/hyperactivity disorder in primary care settings. Pediatrics. 2001; 107: E43.[CrossRef][Medline] [Order article via Infotrieve]
9. Rowland AS, Lesesne CA, Abramowitz AJ. The epidemiology of attention-deficit/hyperactivity disorder (ADHD): a public health view. Ment Retard Dev Disabil Res Rev. 2002; 8: 162–170.[CrossRef][Medline] [Order article via Infotrieve]
10. Diagnostic and Statistical Manual of Mental Disorders. Washington, DC: American Psychiatric Association; 1994.
11. Mayes SD, Calhoun SL, Crowell EW. Learning disabilities and ADHD: overlapping spectrum disorders. J Learn Disabil. 2000; 33: 417–424.
12. Wolraich ML, Hannah JN, Baumgaertel A, Feurer ID. Examination of DSM-IV criteria for attention deficit/hyperactivity disorder in a county-wide sample. J Dev Behav Pediatr. 1998; 19: 162–168.[Medline] [Order article via Infotrieve]
13. Spencer TJ. ADHD and comorbidity in childhood. J Clin Psychiatry. 2006; 67 (suppl 8): 27–31.
14. Durston S, Hulshoff Pol HE, Schnack HG, Buitelaar JK, Steenhuis MP, Minderaa RB, Kahn RS, van Engeland H. Magnetic resonance imaging of boys with attention-deficit/hyperactivity disorder and their unaffected siblings. J Am Acad Child Adolesc Psychiatry. 2004; 43: 332–340.[CrossRef][Medline] [Order article via Infotrieve]
15. Lombroso PJ, Pauls DL, Leckman JF. Genetic mechanisms in childhood psychiatric disorders. J Am Acad Child Adolesc Psychiatry. 1994; 33: 921–938.[Medline] [Order article via Infotrieve]
16. Faraone SV, Biederman J, Keenan K, Tsuang MT. A family-genetic study of girls with DSM-III attention deficit disorder. Am J Psychiatry. 1991; 148: 112–117.
17. Faraone SV, Biederman J, Milberger S. An exploratory study of ADHD among second-degree relatives of ADHD children. Biol Psychiatry. 1994; 35: 398–402.[CrossRef][Medline] [Order article via Infotrieve]
18. Faraone SV, Biederman J, Chen WJ, Milberger S, Warburton R, Tsuang MT. Genetic heterogeneity in attention-deficit hyperactivity disorder (ADHD): gender, psychiatric comorbidity, and maternal ADHD. J Abnorm Psychol. 1995; 104: 334–345.[CrossRef][Medline] [Order article via Infotrieve]
19. Faraone SV, Perlis RH, Doyle AE, Smoller JW, Goralnick JJ, Holmgren MA, Sklar P. Molecular genetics of attention-deficit/hyperactivity disorder. Biol Psychiatry. 2005; 57: 1313–1323.[CrossRef][Medline] [Order article via Infotrieve]
20. Goodman R, Stevenson J. A twin study of hyperactivity, II: the aetiological role of genes, family relationships and perinatal adversity. J Child Psychol Psychiatry. 1989; 30: 691–709.[Medline] [Order article via Infotrieve]
21. Linnet KM, Dalsgaard S, Obel C, Wisborg K, Henriksen TB, Rodriguez A, Kotimaa A, Moilanen I, Thomsen PH, Olsen J, Jarvelin MR. Maternal lifestyle factors in pregnancy risk of attention deficit hyperactivity disorder and associated behaviors: review of the current evidence. Am J Psychiatry. 2003; 160: 1028–1040.
22. Thapar A, Fowler T, Rice F, Scourfield J, van den Bree M, Thomas H, Harold G, Hay D. Maternal smoking during pregnancy and attention deficit hyperactivity disorder symptoms in offspring. Am J Psychiatry. 2003; 160: 1985–1989.
23. Becker K, Holtmann M, Laucht M, Schmidt MH. Are regulatory problems in infancy precursors of later hyperkinetic symptoms? Acta Paediatr. 2004; 93: 1463–1469.[CrossRef][Medline] [Order article via Infotrieve]
24. Bradley JD, Golden CJ. Biological contributions to the presentation and understanding of attention-deficit/hyperactivity disorder: a review. Clin Psychol Rev. 2001; 21: 907–929.[CrossRef][Medline] [Order article via Infotrieve]
25. Bass JL, Corwin M, Gozal D, Moore C, Nishida H, Parker S, Schonwald A, Wilker RE, Stehle S, Kinane TB. The effect of chronic or intermittent hypoxia on cognition in childhood: a review of the evidence. Pediatrics. 2004; 114: 805–816.
26. Strother CR. Minimal cerebral dysfunction: a historical overview. Ann N Y Acad Sci. 1973; 205: 6–17.[CrossRef][Medline] [Order article via Infotrieve]
27. Max JE, Arndt S, Castillo CS, Bokura H, Robin DA, Lindgren SD, Smith WL Jr, Sato Y, Mattheis PJ. Attention-deficit hyperactivity symptomatology after traumatic brain injury: a prospective study. J Am Acad Child Adolesc Psychiatry. 1998; 37: 841–847.[CrossRef][Medline] [Order article via Infotrieve]
28. Taylor E. Clinical foundations of hyperactivity research. Behav Brain Res. 1998; 94: 11–24.[CrossRef][Medline] [Order article via Infotrieve]
29. Arnold GL, Vladutiu CJ, Orlowski CC, Blakely EM, DeLuca J. Prevalence of stimulant use for attentional dysfunction in children with phenylketonuria. J Inherit Metab Dis. 2004; 27: 137–143.[CrossRef][Medline] [Order article via Infotrieve]
30. Mahle WT, Clancy RR, Moss EM, Gerdes M, Jobes DR, Wernovsky G. Neurodevelopmental outcome and lifestyle assessment in school-aged and adolescent children with hypoplastic left heart syndrome. Pediatrics. 2000; 105: 1082–1089.
31. Kirshbom PM, Flynn TB, Clancy RR, Ittenbach RF, Hartman DM, Paridon SM, Wernovsky G, Spray TL, Gaynor JW. Late neurodevelopmental outcome after repair of total anomalous pulmonary venous connection. J Thorac Cardiovasc Surg. 2005; 129: 1091–1097.
32. Shprintzen RJ. Velocardiofacial syndrome. Otolaryngol Clin North Am. 2000; 33: 1217–1240, vi.
33. Gothelf D, Gruber R, Presburger G, Dotan I, Brand-Gothelf A, Burg M, Inbar D, Steinberg T, Frisch A, Apter A, Weizman A. Methylphenidate treatment for attention-deficit/hyperactivity disorder in children and adolescents with velocardiofacial syndrome: an open-label study. J Clin Psychiatry. 2003; 64: 1163–1169.[Medline] [Order article via Infotrieve]
34. Bagwell CL, Molina BS, Pelham WE Jr, Hoza B. Attention-deficit hyperactivity disorder and problems in peer relations: predictions from childhood to adolescence. J Am Acad Child Adolesc Psychiatry. 2001; 40: 1285–1292.[CrossRef][Medline] [Order article via Infotrieve]
35. Barkley RA, Fischer M, Smallish L, Fletcher K. Young adult outcome of hyperactive children: adaptive functioning in major life activities. J Am Acad Child Adolesc Psychiatry. 2006; 45: 192–202.[CrossRef][Medline] [Order article via Infotrieve]
36. Strine TW, Lesesne CA, Okoro CA, McGuire LC, Chapman DP, Balluz LS, Mokdad AH. Emotional and behavioral difficulties and impairments in everyday functioning among children with a history of attention-deficit/hyperactivity disorder. Prev Chronic Dis. 2006; 3: A52.[Medline] [Order article via Infotrieve]
37. Barkley RA, Fischer M, Smallish L, Fletcher K. Young adult follow-up of hyperactive children: antisocial activities and drug use. J Child Psychol Psychiatry. 2004; 45: 195–211.[CrossRef][Medline] [Order article via Infotrieve]
38. Mannuzza S, Klein RG, Bessler A, Malloy P, Hynes ME. Educational and occupational outcome of hyperactive boys grown up. J Am Acad Child Adolesc Psychiatry. 1997; 36: 1222–1227.[CrossRef][Medline] [Order article via Infotrieve]
39. Fisher PW, Shaffer D, Piacentini JC, Lapkin J, Kafantaris V, Leonard H, Herzog DB. Sensitivity of the Diagnostic Interview Schedule for Children, 2nd edition (DISC-2.1) for specific diagnoses of children and adolescents. J Am Acad Child Adolesc Psychiatry. 1993; 32: 666–673.[Medline] [Order article via Infotrieve]
39A. National Institutes of Health, Consensus Development Conference Statement. Diagnosis and treatment of attention deficit hyperactivity disorder. November 16–18, 1998. Available at: http://consensus.nih.gov/1998/1998AttentionDeficitHyperactivityDisorder110html.htm. Accessed April 18, 2008.
39B. US Food and Drug Administration. Public health advisory for Adderall and Adderall XR. Available at: http://www.fda.gov/cder/drug/advisory/adderall.htm. Accessed April 18, 2008.
39C. US Food and Drug Administration. Detailed view: safety labeling changes approved by FDA Center for Drug Evaluation and Research (CDER)—August 2005. Available at: http://www.fda.gov/medwatch/safety/2005/aug05.htm. Accessed April 18, 2008.
39D. US Food and Drug Administration, Pediatric Advisory Committee. Briefing information. June 30, 2005. Available at: http://www.fda.gov/ohrms/dockets/ac/05/briefing/2005-4152b2.htm. Accessed April 18, 2008.
40. US Food and Drug Administration, Drug Safety and Risk Management Advisory Committee Meeting. February 9–10, 2006. Available at: http://www.fda.gov/ohrms/dockets/ac/06/briefing/2006-4202_00_TOC.htm. Accessed April 18, 2008.
41. US Food and Drug Administration, Pediatric Advisory Committee. Briefing information. March 22, 2006. Available at: http://www.fda.gov/OHRMS/DOCKETS/ac/06/briefing/2006-4210B-Index.htm. Accessed April 18, 2008.
42. Nissen SE. ADHD drugs and cardiovascular risk. N Engl J Med. 2006; 354: 1445–1448.
43. Rappley MD, Moore JW, Dokken D. ADHD drugs and cardiovascular risk. N Engl J Med. 2006; 354: 2296–2298.
44. Biederman J, Spencer TJ, Wilens TE, Prince JB, Faraone SV. Treatment of ADHD with stimulant medications: response to Nissen perspective in the New England Journal of Medicine. J Am Acad Child Adolesc Psychiatry. 2006; 45: 1147–1150.[CrossRef][Medline] [Order article via Infotrieve]
45. Massello W 3rd, Carpenter DA. A fatality due to the intranasal abuse of methylphenidate (Ritalin). J Forensic Sci. 1999; 44: 220–221.[Medline] [Order article via Infotrieve]
46. Riddle MA, Nelson JC, Kleinman CS, Rasmusson A, Leckman JF, King RA, Cohen DJ. Sudden death in children receiving Norpramin: a review of three reported cases and commentary. J Am Acad Child Adolesc Psychiatry. 1991; 30: 104–108.[Medline] [Order article via Infotrieve]
46A. US Food and Drug Administation. FDA directs ADHD drug manufacturers to notify patients about cardiovascular adverse events and psychiatric adverse events. Available at: http://www.fda.gov/bbs/topics/news/2007/new01568.html. Accessed April 18, 2008.
46B. US Food and Drug Administration. FDA asks attention-deficit hyperactivity disorder (ADHD) drug manufacturers to develop patient medication guides. Available at: http://www.fda.gov/cder/drug/infopage/ADHD/default.htm. Accessed April 18, 2008.
47. Berger S, Dhala A, Friedberg DZ. Sudden cardiac death in infants, children, and adolescents. Pediatr Clin North Am. 1999; 46: 221–234.[CrossRef][Medline] [Order article via Infotrieve]
48. Berger S, Kugler JD, Thomas JA, Friedberg DZ. Sudden cardiac death in children and adolescents: introduction and overview. Pediatr Clin North Am. 2004; 51: 1201–1209.[CrossRef][Medline] [Order article via Infotrieve]
49. Kimmelstiel CD, Maron BJ. Role of percutaneous septal ablation in hypertrophic obstructive cardiomyopathy. Circulation. 2004; 109: 452–456.
50. Maron BJ, Spirito P, Roman MJ, Paranicas M, Okin PM, Best LG, Lee ET, Devereux RB. Prevalence of hypertrophic cardiomyopathy in a population-based sample of American Indians aged 51 to 77 years (the Strong Heart Study). Am J Cardiol. 2004; 93: 1510–1514.[CrossRef][Medline] [Order article via Infotrieve]
51. Maron BJ. Hypertrophic cardiomyopathy in childhood. Pediatr Clin North Am. 2004; 51: 1305–1346.[CrossRef][Medline] [Order article via Infotrieve]
52. Maron BJ, Roberts WC, Epstein SE. Sudden death in hypertrophic cardiomyopathy: a profile of 78 patients. Circulation. 1982; 65: 1388–1394.
53. Ackerman MJ. The long QT syndrome: ion channel diseases of the heart. Mayo Clin Proc. 1998; 73: 250–269.[Abstract]
54. Brugada J, Brugada P, Brugada R. The syndrome of right bundle branch block, ST segment elevation in V1 to V3 and sudden death. Cardiovasc Drugs Ther. 2002; 16: 25–27.[CrossRef][Medline] [Order article via Infotrieve]
55. Al Khatib SM, Pritchett EL. Clinical features of Wolff-Parkinson-White syndrome. Am Heart J. 1999; 138 (pt 1): 403–413.[CrossRef][Medline] [Order article via Infotrieve]
56. Vetter VL, Horowitz LN. Electrophysiologic residua and sequelae of surgery for congenital heart defects. Am J Cardiol. 1982; 50: 588–604.[CrossRef][Medline] [Order article via Infotrieve]
57. Vetter VL. Postoperative arrhythmias after surgery for congenital heart defects. In: Zipes DP, ed. Cardiology in Review. Baltimore, Md: Williams & Wilkins; 1994.
58. Atkins DL, Kenney MA. Automated external defibrillators: safety and efficacy in children and adolescents. Pediatr Clin North Am. 2004; 51: 1443–1462.[CrossRef][Medline] [Order article via Infotrieve]
59. Gundry JW, Comess KA, DeRook FA, Jorgenson D, Bardy GH. Comparison of naive sixth-grade children with trained professionals in the use of an automated external defibrillator. Circulation. 1999; 100: 1703–1707.
60. Attari M, Dhala A. Role of invasive and noninvasive testing in risk stratification of sudden cardiac death in children and young adults: an electrophysiologic perspective. Pediatr Clin North Am. 2004; 51: 1355–1378.[CrossRef][Medline] [Order article via Infotrieve]
61. Tasaki H, Hamasaki Y, Ichimaru T. Mass screening for heart disease of school children in Saga city: 7-year follow up study. Jpn Circ J. 1987; 51: 1415–1420.[Medline] [Order article via Infotrieve]
62. Haneda N, Mori C, Nishio T, Saito M, Kajino Y, Watanabe K, Kijima Y, Yamada K. Heart diseases discovered by mass screening in the schools of Shimane Prefecture over a period of 5 years. Jpn Circ J. 1986; 50: 1325–1329.[Medline] [Order article via Infotrieve]
63. Sano S, Komori S, Amano T, Kohno I, Ishihara T, Sawanobori T, Ijiri H, Tamura K. Prevalence of ventricular preexcitation in Japanese schoolchildren. Heart. 1998; 79: 374–378.
64. Corrado D, Basso C, Schiavon M, Thiene G. Screening for hypertrophic cardiomyopathy in young athletes. N Engl J Med. 1998; 339: 364–369.
65. Corrado D, Basso C, Pavei A, Michieli P, Schiavon M, Thiene G. Trends in sudden cardiovascular death in young competitive athletes after implementation of a preparticipation screening program. JAMA. 2006; 296: 1593–1601.
66. Pelliccia A, Di Paolo FM, Corrado D, Buccolieri C, Quattrini FM, Pisicchio C, Spataro A, Biffi A, Granata M, Maron BJ. Evidence for efficacy of the Italian national pre-participation screening programme for identification of hypertrophic cardiomyopathy in competitive athletes. Eur Heart J. 2006; 27: 2196–2200.
67. Corrado D, Pelliccia A, Bjornstad HH, Vanhees L, Biffi A, Borjesson M, Panhuyzen-Goedkoop N, Deligiannis A, Solberg E, Dugmore D, Mellwig KP, Assanelli D, Delise P, van Buuren F, Anastasakis A, Heidbuchel H, Hoffmann E, Fagard R, Priori SG, Basso C, Arbustini E, Blomstrom-Lundqvist C, McKenna WJ, Thiene G, for the Study Group of Sport Cardiology of the Working Group of Cardiac Rehabilitation and Exercise Physiology and the Working Group of Myocardial and Pericardial Diseases of the European Society of Cardiology. Cardiovascular pre-participation screening of young competitive athletes for prevention of sudden death: proposal for a common European protocol: Consensus Statement of the Study Group of Sport Cardiology of the Working Group of Cardiac Rehabilitation and Exercise Physiology and the Working Group of Myocardial and Pericardial Diseases of the European Society of Cardiology. Eur Heart J. 2005; 26: 516–524.
68. Schwartz PJ, Stramba-Badiale M, Segantini A, Austoni P, Bosi G, Giorgetti R, Grancini F, Marni ED, Perticone F, Rosti D, Salice P. Prolongation of the QT interval and the sudden infant death syndrome. N Engl J Med. 1998; 338: 1709–1714.
69. Goulene K, Stramba-Badiale M, Crotti L, Priori SG, Salice P, Mannarino S, Rosati E, Schwartz PJ. Neonatal electrocardiographic screening of genetic arrhythmogenic disorders and congenital cardiovascular diseases: prospective data from 31 000 infants. Eur Heart J. 2005; 26 (suppl): 214. Abstract.
70. Arnestad M, Crotti L, Rognum TO, Insolia R, Pedrazzini M, Ferrandi C, Vege A, Wang DW, Rhodes TE, George AL Jr, Schwartz PJ. Prevalence of long-QT syndrome gene variants in sudden infant death syndrome. Circulation. 2007; 115: 361–367.
71. International Olympic Committee Medical Commission, International Olympic Committee. Sudden Cardiovascular Death in Sport. Lausanne recommendation. Adopted December 10, 2004. Available at: http://multimedia.olympic.org/pdf/en_report_886.pdf. Accessed September 7, 2007.
72. Maron BJ, Thompson PD, Puffer JC, McGrew CA, Strong WB, Douglas PS, Clark LT, Mitten MJ, Crawford MH, Atkins DL, Driscoll DJ, Epstein AE. Cardiovascular preparticipation screening of competitive athletes: a statement for health professionals from the Sudden Death Committee (Clinical Cardiology) and Congenital Cardiac Defects Committee (Cardiovascular Disease in the Young), American Heart Association. Circulation. 1996; 94: 850–856.
73. Glover DW, Maron BJ. Profile of preparticipation cardiovascular screening for high school athletes. JAMA. 1998; 279: 1817–1819.
74. Deleted.
75. Fuller CM. Cost effectiveness analysis of screening of high school athletes for risk of sudden cardiac death. Med Sci Sports Exerc. 2000; 32: 887–890.[Medline] [Order article via Infotrieve]
76. Maron BJ, Thompson P, Ackerman MJ, Balady G, Berger S, Cohen D, Dimeff R, Douglas PS, Glover DW, Hutter AM Jr, Krauss MD, Maron MS, Mitten MJ, Roberts WO, Puffer JC, for the American Heart Association Council on Nutrition, Physical Activity, and Metabolism. Recommendations and considerations related to preparticipation screening for cardiovascular abnormalities in competitive athletes: 2007 update: a scientific statement from the American Heart Association Council on Nutrition, Physical Activity, and Metabolism: endorsed by the American College of Cardiology Foundation. Circulation. 2007; 115: 1643–1655.
77. Gomez JE, Lantry BR, Saathoff KN. Current use of adequate preparticipation history forms for heart disease screening of high school athletes. Arch Pediatr Adolesc Med. 1999; 153: 723–726.
78. Fuller CM, McNulty CM, Spring DA, Arger KM, Bruce SS, Chryssos BE, Drummer EM, Kelley FP, Newmark MJ, Whipple GH. Prospective screening of 5,615 high school athletes for risk of sudden cardiac death. Med Sci Sports Exerc. 1997; 29: 1131–1138.[Medline] [Order article via Infotrieve]
79. Pigozzi F, Spataro A, Fagnani F, Maffulli N. Preparticipation screening for the detection of cardiovascular abnormalities that may cause sudden death in competitive athletes. Br J Sports Med. 2003; 37: 4–5.
80. Sarto P, Merlo L, Noventa D, Basso C, Pelliccia A, Maron BJ. Electrocardiographic changes associated with training and discontinuation of training in an athlete with hypertrophic cardiomyopathy. Am J Cardiol. 2004; 93: 518–519.[CrossRef][Medline] [Order article via Infotrieve]
81. Pelliccia A, Maron BJ, Culasso F, Di Paolo FM, Spataro A, Biffi A, Caselli G, Piovano P. Clinical significance of abnormal electrocardiographic patterns in trained athletes. Circulation. 2000; 102: 278–284.
82. Mitchell JH, Maron BJ, Epstein SE. 16th Bethesda Conference: cardiovascular abnormalities in the athlete: recommendations regarding eligibility for competition. October 3–5, 1984. J Am Coll Cardiol. 1985; 6: 1186–1232.[Medline] [Order article via Infotrieve]
83. Steinberger J, Moller JH, Berry JM, Sinaiko AR. Echocardiographic diagnosis of heart disease in apparently healthy adolescents. Pediatrics. 2000; 105: 815–818.
84. Luo S, Michler K, Johnston P, Macfarlane PW. A comparison of commonly used QT correction formulae: the effect of heart rate on the QTc of normal ECGs. J Electrocardiol. 2004; 37 (suppl): 81–90.[CrossRef][Medline] [Order article via Infotrieve]
85. Ahnve S. Correction of the QT interval for heart rate: review of different formulas and the use of Bazett’s formula in myocardial infarction. Am Heart J. 1985; 109: 568–574.[CrossRef][Medline] [Order article via Infotrieve]
86. Goldenberg I, Moss AJ, Zareba W. QT interval: how to measure it and what is "normal." J Cardiovasc Electrophysiol. 2006; 17: 333–336.[CrossRef][Medline] [Order article via Infotrieve]
87. Vincent GM, Timothy KW, Leppert M, Keating M. The spectrum of symptoms and QT intervals in carriers of the gene for the long-QT syndrome. N Engl J Med. 1992; 327: 846–852.[Abstract]
88. Goldenberg I, Mathew J, Moss AJ, McNitt S, Peterson DR, Zareba W, Benhorin J, Zhang L, Vincent GM, Andrews ML, Robinson JL, Morray B. Corrected QT variability in serial electrocardiograms in long QT syndrome: the importance of the maximum corrected QT for risk stratification. J Am Coll Cardiol. 2006; 48: 1047–1052.
89. Quaglini S, Rognoni C, Spazzolini C, Priori SG, Mannarino S, Schwartz PJ. Cost-effectiveness of neonatal ECG screening for the long QT syndrome. Eur Heart J. 2006; 27: 1824–1832.
90. Van Hare GF, Perry J, Berul CI, Triedman JK. Cost effectiveness of neonatal ECG screening for the long QT syndrome. Eur Heart J. 2007; 28: 137.
91. Michelson D, Allen AJ, Busner J, Casat C, Dunn D, Kratochvil C, Newcorn J, Sallee FR, Sangal RB, Saylor K, West S, Kelsey D, Wernicke J, Trapp NJ, Harder D. Once-daily atomoxetine treatment for children and adolescents with attention deficit hyperactivity disorder: a randomized, placebo-controlled study. Am J Psychiatry. 2002; 159: 1896–1901.
92. Wilens TE. Mechanism of action of agents used in attention-deficit/hyperactivity disorder. J Clin Psychiatry. 2006; 67 (suppl 8): 32–38.[Medline] [Order article via Infotrieve]
93. Biederman J. New developments in pediatric psychopharmacology. J Am Acad Child Adolesc Psychiatry. 1992; 31: 14–15.[Medline] [Order article via Infotrieve]
94. Solanto MV. Neuropsychopharmacological mechanisms of stimulant drug action in attention-deficit hyperactivity disorder: a review and integration. Behav Brain Res. 1998; 94: 127–152.[CrossRef][Medline] [Order article via Infotrieve]
95. Spencer T, Biederman J, Wilens T, Harding M, O’Donnell D, Griffin S. Pharmacotherapy of attention-deficit hyperactivity disorder across the life cycle. J Am Acad Child Adolesc Psychiatry. 1996; 35: 409–432.[CrossRef][Medline] [Order article via Infotrieve]
96. Charach A, Ickowicz A, Schachar R. Stimulant treatment over five years: adherence, effectiveness, and adverse effects. J Am Acad Child Adolesc Psychiatry. 2004; 43: 559–567.[CrossRef][Medline] [Order article via Infotrieve]
97. Gillberg C, Melander H, von Knorring AL, Janols LO, Thernlund G, Hagglof B, Eidevall-Wallin L, Gustafsson P, Kopp S. Long-term stimulant treatment of children with attention-deficit hyperactivity disorder symptoms: a randomized, double-blind, placebo-controlled trial. Arch Gen Psychiatry. 1997; 54: 857–864.
98. MTA Cooperative Group. National Institute of Mental Health Multimodal Treatment Study of ADHD follow-up: 24-month outcomes of treatment strategies for attention-deficit/hyperactivity disorder. Pediatrics. 2004; 113: 754–761.
99. Swanson JM, Kraemer HC, Hinshaw SP, Arnold LE, Conners CK, Abikoff HB, Clevenger W, Davies M, Elliott GR, Greenhill LL, Hechtman L, Hoza B, Jensen PS, March JS, Newcorn JH, Owens EB, Pelham WE, Schiller E, Severe JB, Simpson S, Vitiello B, Wells K, Wigal T, Wu M. Clinical relevance of the primary findings of the MTA: success rates based on severity of ADHD and ODD symptoms at the end of treatment. J Am Acad Child Adolesc Psychiatry. 2001; 40: 168–179.[CrossRef][Medline] [Order article via Infotrieve]
100. Wilens T, Pelham W, Stein M, Conners CK, Abikoff H, Atkins M, August G, Greenhill L, McBurnett K, Palumbo D, Swanson J, Wolraich M. ADHD treatment with once-daily OROS methylphenidate: interim 12-month results from a long-term open-label study. J Am Acad Child Adolesc Psychiatry. 2003; 42: 424–433.[Medline] [Order article via Infotrieve]
101. Elia J, Borcherding BG, Rapoport JL, Keysor CS. Methylphenidate and dextroamphetamine treatments of hyperactivity: are there true nonresponders? Psychiatry Res. 1991; 36: 141–155.[CrossRef][Medline] [Order article via Infotrieve]
102. Greenhill LL, Swanson JM, Vitiello B, Davies M, Clevenger W, Wu M, Arnold LE, Abikoff HB, Bukstein OG, Conners CK, Elliott GR, Hechtman L, Hinshaw SP, Hoza B, Jensen PS, Kraemer HC, March JS, Newcorn JH, Severe JB, Wells K, Wigal T. Impairment and deportment responses to different methylphenidate doses in children with ADHD: the MTA titration trial. J Am Acad Child Adolesc Psychiatry. 2001; 40: 180–187.[CrossRef][Medline] [Order article via Infotrieve]
103. Biederman J, Lopez FA, Boellner SW, Chandler MC. A randomized, double-blind, placebo-controlled, parallel-group study of SLI381 (Adderall XR) in children with attention-deficit/hyperactivity disorder. Pediatrics. 2002; 110(pt 1): 258–266.
104. Wolraich ML, Greenhill LL, Pelham W, Swanson J, Wilens T, Palumbo D, Atkins M, McBurnett K, Bukstein O, August G. Randomized, controlled trial of oros methylphenidate once a day in children with attention-deficit/hyperactivity disorder. Pediatrics. 2001; 108: 883–892.
105. McGough JJ, Biederman J, Wigal SB, Lopez FA, McCracken JT, Spencer T, Zhang Y, Tulloch SJ. Long-term tolerability and effectiveness of once-daily mixed amphetamine salts (Adderall XR) in children with ADHD. J Am Acad Child Adolesc Psychiatry. 2005; 44: 530–538.[CrossRef][Medline] [Order article via Infotrieve]
106. Swanson JM, Elliott GR, Greenhill LL, Wigal T, Arnold LE, Vitiello B, Hechtman L, Epstein JN, Pelham WE, Abikoff HB, Newcorn JH, Molina BS, Hinshaw SP, Wells KC, Hoza B, Jensen PS, Gibbons RD, Hur K, Stehli A, Davies M, March JS, Conners CK, Caron M, Volkow ND. Effects of stimulant medication on growth rates across 3 years in the MTA follow-up. J Am Acad Child Adolesc Psychiatry. 2007; 46: 1015–1027.[CrossRef][Medline] [Order article via Infotrieve]
107. Findling RL, Short EJ, Manos MJ. Short-term cardiovascular effects of methylphenidate and adderall. J Am Acad Child Adolesc Psychiatry. 2001; 40: 525–529.[CrossRef][Medline] [Order article via Infotrieve]
108. Samuels JA, Franco K, Wan F, Sorof JM. Effect of stimulants on 24-h ambulatory blood pressure in children with ADHD: a double-blind, randomized, cross-over trial. Pediatr Nephrol. 2006; 21: 92–95.[CrossRef][Medline] [Order article via Infotrieve]
109. Findling RL, Biederman J, Wilens TE, Spencer TJ, McGough JJ, Lopez FA, Tulloch SJ, for the SLI381.301 and .302 Study Groups. Short- and long-term cardiovascular effects of mixed amphetamine salts extended release in children. J Pediatr. 2005; 147: 348–354.[CrossRef][Medline] [Order article via Infotrieve]
110. Donner R, Michaels MA, Ambrosini PJ. Cardiovascular effects of mixed amphetamine salts extended release in the treatment of school-aged children with attention-deficit/hyperactivity disorder. Biol Psychiatry. 2007; 61: 706–712.[CrossRef][Medline] [Order article via Infotrieve]
111. Daley KC. Updates on attention deficit hyperactivity disorder, child abuse and neglect, and sudden infant death syndrome. Curr Opin Pediatr. 2003; 15: 216–225.[CrossRef][Medline] [Order article via Infotrieve]
112. Lucas PB, Gardner DL, Wolkowitz OM, Tucker EE, Cowdry RW. Methylphenidate-induced cardiac arrhythmias. N Engl J Med. 1986; 315: 1485.[Medline] [Order article via Infotrieve]
113. Simpson LL. Mechanism of the adverse interaction between monoamine oxidase inhibitors and amphetamine. J Pharmacol Exp Ther. 1978; 205: 392–399.
114. Stratton SJ, Rogers C, Brickett K, Gruzinski G. Factors associated with sudden death of individuals requiring restraint for excited delirium. Am J Emerg Med. 2001; 19: 187–191.[CrossRef][Medline] [Order article via Infotrieve]
115. Patel MM, Wright DW, Ratcliff JJ, Miller MA. Shedding new light on the "safe" club drug: methylenedioxymethamphetamine (ecstasy)-related fatalities. Acad Emerg Med. 2004; 11: 208–210.[Medline] [Order article via Infotrieve]
116. Frishman WH, Del Vecchio A, Sanal S, Ismail A. Cardiovascular manifestations of substance abuse, part 2: alcohol, amphetamines, heroin, cannabis, and caffeine. Heart Dis. 2003; 5: 253–271.[CrossRef][Medline] [Order article via Infotrieve]
117. Schindler CW, Zheng JW, Tella SR, Goldberg SR. Pharmacological mechanisms in the cardiovascular effects of methamphetamine in conscious squirrel monkeys. Pharmacol Biochem Behav. 1992; 42: 791–796.[CrossRef][Medline] [Order article via Infotrieve]
118. Lester SJ, Baggott M, Welm S, Schiller NB, Jones RT, Foster E, Mendelson J. Cardiovascular effects of 3,4-methylenedioxymethamphetamine: a double-blind, placebo-controlled trial. Ann Intern Med. 2000; 133: 969–973.
119. Milroy CM, Clark JC, Forrest AR. Pathology of deaths associated with "ecstasy" and "eve" misuse. J Clin Pathol. 1996; 49: 149–153.
120. Gallardo-Carpentier A, Aileru AA, Carpentier RG. Arrhythmogenic and antiarrhythmic actions of substances of abuse: effects on triggered activity. J Electrocardiol. 1997; 30: 137–142.[CrossRef][Medline] [Order article via Infotrieve]
121. Nishida N, Ikeda N, Kudo K, Esaki R. Sudden unexpected death of a methamphetamine abuser with cardiopulmonary abnormalities: a case report. Med Sci Law. 2003; 43: 267–271.[Medline] [Order article via Infotrieve]
122. Wernicke JF, Faries D, Girod D, Brown J, Gao H, Kelsey D, Quintana H, Lipetz R, Michelson D, Heiligenstein J. Cardiovascular effects of atomoxetine in children, adolescents, and adults. Drug Saf. 2003; 26: 729–740.[CrossRef][Medline] [Order article via Infotrieve]
123. Scahill L, Chappell PB, Kim YS, Schultz RT, Katsovich L, Shepherd E, Arnsten AF, Cohen DJ, Leckman JF. A placebo-controlled study of guanfacine in the treatment of children with tic disorders and attention deficit hyperactivity disorder. Am J Psychiatry. 2001; 158: 1067–1074.
124. Deleted.[CrossRef][Medline] [Order article via Infotrieve]
125. Posey DJ, Puntney JI, Sasher TM, Kem DL, McDougle CJ. Guanfacine treatment of hyperactivity and inattention in pervasive developmental disorders: a retrospective analysis of 80 cases. J Child Adolesc Psychopharmacol. 2004; 14: 233–241.[CrossRef][Medline] [Order article via Infotrieve]
126. Connor DF, Fletcher KE, Swanson JM. A meta-analysis of clonidine for symptoms of attention-deficit hyperactivity disorder. J Am Acad Child Adolesc Psychiatry. 1999; 38: 1551–1559.[CrossRef][Medline] [Order article via Infotrieve]
127. Wilens TE, Spencer TJ, Swanson JM, Connor DF, Cantwell D. Combining methylphenidate and clonidine: a clinically sound medication option. J Am Acad Child Adolesc Psychiatry. 1999; 38: 614–619.[CrossRef][Medline] [Order article via Infotrieve]
128. Wilens TE, Haight BR, Horrigan JP, Hudziak JJ, Rosenthal NE, Connor DF, Hampton KD, Richard NE, Modell JG. Bupropion XL in adults with attention-deficit/hyperactivity disorder: a randomized, placebo-controlled study. Biol Psychiatry. 2005; 57: 793–801.[CrossRef][Medline] [Order article via Infotrieve]
129. Barrickman LL, Perry PJ, Allen AJ, Kuperman S, Arndt SV, Herrmann KJ, Schumacher E. Bupropion versus methylphenidate in the treatment of attention-deficit hyperactivity disorder. J Am Acad Child Adolesc Psychiatry. 1995; 34: 649–657.[CrossRef][Medline] [Order article via Infotrieve]
130. Hazell PL, Stuart JE. A randomized controlled trial of clonidine added to psychostimulant medication for hyperactive and aggressive children. J Am Acad Child Adolesc Psychiatry. 2003; 42: 886–894.[CrossRef][Medline] [Order article via Infotrieve]
131. Goetz CG, Tanner CM, Wilson RS, Carroll VS, Como PG, Shannon KM. Clonidine and Gilles de la Tourette’s syndrome: double-blind study using objective rating methods. Ann Neurol. 1987; 21: 307–310.[CrossRef][Medline] [Order article via Infotrieve]
132. Leckman JF, Hardin MT, Riddle MA, Stevenson J, Ort SI, Cohen DJ. Clonidine treatment of Gilles de la Tourette’s syndrome. Arch Gen Psychiatry. 1991; 48: 324–328.
133. Leckman JF, Detlor J, Harcherik DF, Young JG, Anderson GM, Shaywitz BA, Cohen DJ. Acute and chronic clonidine treatment in Tourette’s syndrome: a preliminary report on clinical response and effect on plasma and urinary catecholamine metabolites, growth hormone, and blood pressure. J Am Acad Child Psychiatry. 1983; 22: 433–440.[Medline] [Order article via Infotrieve]
134. Leckman JF, Detlor J, Harcherik DF, Ort S, Shaywitz BA, Cohen DJ. Short- and long-term treatment of Tourette’s syndrome with clonidine: a clinical perspective. Neurology. 1985; 35: 343–351.
135. Conners CK, Casat CD, Gualtieri CT, Weller E, Reader M, Reiss A, Weller RA, Khayrallah M, Ascher J. Bupropion hydrochloride in attention deficit disorder with hyperactivity. J Am Acad Child Adolesc Psychiatry. 1996; 35: 1314–1321.[CrossRef][Medline] [Order article via Infotrieve]
136. Wilens TE, Hammerness PG, Biederman J, Kwon A, Spencer TJ, Clark S, Scott M, Podolski A, Ditterline JW, Morris MC, Moore H. Blood pressure changes associated with medication treatment of adults with attention-deficit/hyperactivity disorder. J Clin Psychiatry. 2005; 66: 253–259.[Medline] [Order article via Infotrieve]
137. Wenger TL, Stern WC. The cardiovascular profile of bupropion. J Clin Psychiatry. 1983; 44(pt 2): 176–182.[Medline] [Order article via Infotrieve]
138. Dunner DL, Zisook S, Billow AA, Batey SR, Johnston JA, Ascher JA. A prospective safety surveillance study for bupropion sustained-release in the treatment of depression. J Clin Psychiatry. 1998; 59: 366–373.[Medline] [Order article via Infotrieve]
139. Isbister GK, Balit CR. Bupropion overdose: QTc prolongation and its clinical significance. Ann Pharmacother. 2003; 37: 999–1002.
140. Biederman J, Baldessarini RJ, Wright V, Knee D, Harmatz JS, Goldblatt A. A double-blind placebo controlled study of desipramine in the treatment of ADD, II: serum drug levels and cardiovascular findings. J Am Acad Child Adolesc Psychiatry. 1989; 28: 903–911.[Medline] [Order article via Infotrieve]
141. Varley CK, McClellan J. Case study: two additional sudden deaths with tricyclic antidepressants. J Am Acad Child Adolesc Psychiatry. 1997; 36: 390–394.[CrossRef][Medline] [Order article via Infotrieve]
142. Akhondzadeh S, Tavakolian R, Davari-Ashtiani R, Arabgol F, Amini H. Selegiline in the treatment of attention deficit hyperactivity disorder in children: a double blind and randomized trial. Prog Neuropsychopharmacol Biol Psychiatry. 2003; 27: 841–845.[CrossRef][Medline] [Order article via Infotrieve]
143. Moir DC, Cornwell WB, Dingwall-Fordyce I, Crooks J, O’Malley K, Turnbull MJ, Weir RD. Cardiotoxicity of amitriptyline. Lancet. 1972; 2: 561–564.[Medline] [Order article via Infotrieve]
144. Robinson DS, Barker E. Tricyclic antidepressant cardiotoxicity. JAMA. 1976; 236: 2089–2090.
145. Steingard R, Biederman J, Spencer T, Wilens T, Gonzalez A. Comparison of clonidine response in the treatment of attention-deficit hyperactivity disorder with and without comorbid tic disorders. J Am Acad Child Adolesc Psychiatry. 1993; 32: 350–353.[Medline] [Order article via Infotrieve]
146. Wilens TE, Biederman J, Spencer T. Clonidine for sleep disturbances associated with attention-deficit hyperactivity disorder. J Am Acad Child Adolesc Psychiatry. 1994; 33: 424–426.[CrossRef][Medline] [Order article via Infotrieve]
147. Cantwell DP, Swanson J, Connor DF. Case study: adverse response to clonidine. J Am Acad Child Adolesc Psychiatry. 1997; 36: 539–544.[CrossRef][Medline] [Order article via Infotrieve]
148. Richters JE, Arnold LE, Jensen PS, Abikoff H, Conners CK, Greenhill LL, Hechtman L, Hinshaw SP, Pelham WE, Swanson JM. NIMH collaborative multisite multimodal treatment study of children with ADHD, I: background and rationale. J Am Acad Child Adolesc Psychiatry. 1995; 34: 987–1000.[CrossRef][Medline] [Order article via Infotrieve]
149. American Academy of Pediatrics, Subcommittee on Attention-Deficit/Hyperactivity Disorder and Committee on Quality Improvement. Clinical practice guideline: treatment of the school-aged child with attention-deficit/hyperactivity disorder. Pediatrics. 2001; 108: 1033–1044.
150. Wilens TE, Prince JB, Spencer TJ, Biederman J. Stimulants and sudden death: what is a physician to do? Pediatrics. 2006; 118: 1215–1219.
151. Visser SN, Lesesne CA. Mental Health in the United States: Prevalence of Diagnosis and Medication Treatment for Attention-Deficit/Hyperactivity Disorder–United States, 2003. Atlanta, Ga: Centers for Disease Control and Prevention, Division of Human Development and Disability, National Center on Birth Defects and Developmental Disabilities; 2005. MMWR 54, 842-847.
152. Zheng ZJ, Croft JB, Giles WH, Mensah GA. Sudden cardiac death in the United States, 1989 to 1998. Circulation. 2001; 104: 2158–2163.
153. Zheng ZJ, Croft JB, Giles WH, Mensah GA. Out-of-hospital cardiac deaths in adolescents and young adults in the United States, 1989 to 1998. Am J Prev Med. 2005; 29 (suppl 1): 36–41.[CrossRef][Medline] [Order article via Infotrieve]
154. Kratochvil CJ, Heiligenstein JH, Dittmann R, Spencer TJ, Biederman J, Wernicke J, Newcorn JH, Casat C, Milton D, Michelson D. Atomoxetine and methylphenidate treatment in children with ADHD: a prospective, randomized, open-label trial. J Am Acad Child Adolesc Psychiatry. 2002; 41: 776–784.[CrossRef][Medline] [Order article via Infotrieve]
155. Michelson D, Adler L, Spencer T, Reimherr FW, West SA, Allen AJ, Kelsey D, Wernicke J, Dietrich A, Milton D. Atomoxetine in adults with ADHD: two randomized, placebo-controlled studies. Biol Psychiatry. 2003; 53: 112–120.[CrossRef][Medline] [Order article via Infotrieve]
156. Hunt RD, Arnsten AF, Asbell MD. An open trial of guanfacine in the treatment of attention-deficit hyperactivity disorder. J Am Acad Child Adolesc Psychiatry. 1995; 34: 50–54.[CrossRef][Medline] [Order article via Infotrieve]
157. Biederman J, Swanson JM, Wigal SB, Kratochvil CJ, Boellner SW, Earl CQ, Jiang J, Greenhill L. Efficacy and safety of modafinil film-coated tablets in children and adolescents with attention-deficit/hyperactivity disorder: results of a randomized, double-blind, placebo-controlled, flexible-dose study. Pediatrics. 2005; 116: e777–e784.
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