Natural history of chronic second-degree atrioventricular nodal block

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Circulation. 1981;63:1043-1049

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ARTICLES

Natural history of chronic second-degree atrioventricular nodal block

B Strasberg, F Amat-Y-Leon, RC Dhingra, E Palileo, S Swiryn, R Bauernfeind, C Wyndham and KM Rosen

This report details our experience with documented chronic second- degree atrioventricular (AV) nodal block (proximal to His [H]) in 56 patients. Forty-six men (82%) and 10 women (18%), ages 18-87 years, were studied. Nineteen of the patients (34%) had no organic heart disease (including seven trained athletes) and 37 (66%) had organic heart disease. ECGs in all patients demonstrated episodes of type I second-degree block; five patients also had periods of 2:1 block. Prospective follow-up patients with no organic heart disease (157-2280 days, mean 1395 +/- 636 days) revealed one patient with clear indication for permanent pacing because of bradyarrhythmic symptoms (permanently placed on day 220 of follow-up). Two patients died nonsuddenly. In patients with organic heart disease (prospective follow- up of 60-2950 days, mean 1347 +/- 825 days), pacemakers were implanted in 10 patients, primarily for treatment of congestive heart failure in eight and syncope in two. Sixteen patients died -- three suddenly, seven with congestive heart failure, two of an acute myocardial infarction and four of causes unrelated to cardiac disease. In summary, chronic second-degree AV nodal block has a relatively benign course in patients without organic heart disease. In patients with organic heart disease, prognosis is poor and related to the severity of underlying heart disease.

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				Writing Committee Members, A. E. Epstein, J. P. DiMarco, K. A. Ellenbogen, N.A. M. Estes III, R. A. Freedman, L. S. Gettes, A. M. Gillinov, G. Gregoratos, S. C. Hammill, et al. ACC/AHA/HRS 2008 Guidelines for Device-Based Therapy of Cardiac Rhythm Abnormalities: Executive Summary: A Report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (Writing Committee to Revise the ACC/AHA/NASPE 2002 Guideline Update for Implantation of Cardiac Pacemakers and Antiarrhythmia Devices): Developed in Collaboration With the American Association for Thoracic Surgery and Society of Thoracic Surgeons Circulation, May 27, 2008; 117(21): 2820 - 2840. [Full Text] [PDF]

				Authors/Task Force Members, P. E. Vardas, A. Auricchio, J.-J. Blanc, J.-C. Daubert, H. Drexler, H. Ector, M. Gasparini, C. Linde, F. B. Morgado, et al. Guidelines for cardiac pacing and cardiac resynchronization therapy: The Task Force for Cardiac Pacing and Cardiac Resynchronization Therapy of the European Society of Cardiology. Developed in Collaboration with the European Heart Rhythm Association Europace, October 1, 2007; 9(10): 959 - 998. [Full Text] [PDF]

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				Committee Members, G. Gregoratos, J. Abrams, A. E. Epstein, R. A. Freedman, D. L. Hayes, M. A. Hlatky, R. E. Kerber, G. V. Naccarelli, M. H. Schoenfeld, et al. ACC/AHA/NASPE 2002 Guideline Update for Implantation of Cardiac Pacemakers and Antiarrhythmia Devices--Summary Article: A Report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (ACC/AHA/NASPE Committee to Update the 1998 Pacemaker Guidelines) J. Am. Coll. Cardiol., November 6, 2002; 40(9): 1703 - 1719. [Full Text] [PDF]

				G. Gregoratos, J. Abrams, A. E. Epstein, R. A. Freedman, D. L. Hayes, M. A. Hlatky, R. E. Kerber, G. V. Naccarelli, M. H. Schoenfeld, M. J. Silka, et al. ACC/AHA/NASPE 2002 Guideline Update for Implantation of Cardiac Pacemakers and Antiarrhythmia Devices: Summary Article: A Report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (ACC/AHA/NASPE Committee to Update the 1998 Pacemaker Guidelines) Circulation, October 15, 2002; 106(16): 2145 - 2161. [Full Text] [PDF]

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				K.-C. Hung, F.-C. Lin, M.-S. Chern, H.-J. Chang, I.-C. Hsieh, and D. Wu Mechanisms and clinical significance of transient atrioventricular block during dobutamine stress echocardiography J. Am. Coll. Cardiol., October 1, 1999; 34(4): 998 - 1004. [Abstract] [Full Text] [PDF]

				B. Phibbs, H. S. Friedman, T. B. Graboys, B. Lown, H. J. L. Marriott, W. P. Nelson, and T. Preston Indications for Pacing in the Treatment of Bradyarrhythmias: Report of an Independent Study Group JAMA, September 14, 1984; 252(10): 1307 - 1311. [Abstract] [PDF]