(Circulation. 2000;102:278.)
© 2000 American Heart Association, Inc.
Clinical Investigation and Reports |
Clinical Significance of Abnormal Electrocardiographic Patterns in Trained Athletes
From the Institute of Sports Science, Department of Medicine, Italian National Olympic Committee, Rome, Italy (A.P., F.M.D.P., A.S., A.B., G.C., P.P.); the Minneapolis Heart Institute Foundation, Minneapolis, Minnesota (B.J.M.); and the Department of Experimental Medicine, University La Sapienza, Rome, Italy (F.C.).
Correspondence to Antonio Pelliccia, MD, Institute of Sports Science, Department of Medicine, Via dei Campi Sportivi 46, 00197 Rome, Italy. E-Mail ISS_Medicina{at}coni.it
Background—The prevalence, clinical significance, and determinants of abnormal ECG patterns in trained athletes remain largely unresolved.
Methods and Results—We compared ECG patterns with cardiac morphology (as assessed by echocardiography) in 1005 consecutive athletes (aged 24±6 years; 75% male) who were participating in 38 sporting disciplines. ECG patterns were distinctly abnormal in 145 athletes (14%), mildly abnormal in 257 (26%), and normal or with minor alterations in 603 (60%). Structural cardiovascular abnormalities were identified in only 53 athletes (5%). Larger cardiac dimensions were associated with abnormal ECG patterns: left ventricular end-diastolic cavity dimensions were 56.0±5.6, 55.4±5.7, and 53.7±5.7 mm (P<0.001) and maximum wall thicknesses were 10.1±1.4, 9.8±1.3, and 9.3±1.4 mm (P<0.001) in distinctly abnormal, mildly abnormal, and normal ECGs, respectively. Abnormal ECGs were also most associated with male sex, younger age (<20 years), and endurance sports (cycling, rowing/canoeing, and cross-country skiing). A subset of athletes (5% of the 1005) showed particularly abnormal or bizarre ECG patterns, but no evidence of structural cardiovascular abnormalities or an increase in cardiac dimensions.
Conclusions—Most athletes (60%) in this large cohort had ECGs that were completely normal or showed only minor alterations. A variety of abnormal ECG patterns occurred in 40%; this was usually indicative of physiological cardiac remodeling. A small but important subgroup of athletes without cardiac morphological changes showed striking ECG abnormalities that suggested cardiovascular disease; however, these changes were likely an innocent consequence of long-term, intense athletic training and, therefore, another component of athlete heart syndrome. Such false-positive ECGs represent a potential limitation to routine ECG testing as part of preparticipation screening.
Key Words: athlete’s heart • 12-lead ECG • echocardiography • screening for cardiovascular diseases
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