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Original Article
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Volume 342:1937-1945 June 29, 2000 Number 26
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Electrophysiologic Testing to Identify Patients with Coronary Artery Disease Who Are at Risk for Sudden Death
Alfred E. Buxton, M.D., Kerry L. Lee, Ph.D., Lorenzo DiCarlo, M.D., Michael R. Gold, M.D., G. Stephen Greer, M.D., Eric N. Prystowsky, M.D., Michael F. O'Toole, M.D., Anthony Tang, M.D., John D. Fisher, M.D., James Coromilas, M.D., Mario Talajic, M.D., Gail Hafley, M.S., for The Multicenter Unsustained Tachycardia Trial Investigators

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ABSTRACT

Background The mortality rate among patients with coronary artery disease, abnormal ventricular function, and unsustained ventricular tachycardia is high. The usefulness of electrophysiologic testing for risk stratification in these patients is unclear.

Methods We performed electrophysiologic testing in patients who had coronary artery disease, a left ventricular ejection fraction of 40 percent or less, and asymptomatic, unsustained ventricular tachycardia. Patients in whom sustained ventricular tachyarrhythmias could be induced were randomly assigned to receive either antiarrhythmic therapy guided by electrophysiologic testing or no antiarrhythmic therapy. The primary end point was cardiac arrest or death from arrhythmia. Patients without inducible tachyarrhythmias were followed in a registry. We compared the outcomes of 1397 patients in the registry with those of 353 patients with inducible tachyarrhythmias who were randomly assigned to receive no antiarrhythmic therapy in order to assess the prognostic value of electrophysiologic testing.

Results Patients were followed for a median of 39 months. In a Kaplan–Meier analysis, two-year and five-year rates of cardiac arrest or death due to arrhythmia were 12 and 24 percent, respectively, among the patients in the registry, as compared with 18 and 32 percent among the patients with inducible tachyarrhythmias who were assigned to no antiarrhythmic therapy (adjusted P<0.001). Overall mortality after five years was 48 percent among the patients with inducible tachyarrhythmias, as compared with 44 percent among the patients in the registry (adjusted P= 0.005). Deaths among patients without inducible tachyarrhythmias were less likely to be classified as due to arrhythmia than those among patients with inducible tachyarrhythmias (45 and 54 percent, respectively; P=0.06).

Conclusions Patients with coronary artery disease, left ventricular dysfunction, and asymptomatic, unsustained ventricular tachycardia in whom sustained ventricular tachyarrhythmias cannot be induced have a significantly lower risk of sudden death or cardiac arrest and lower overall mortality than similar patients with inducible sustained tachyarrhythmias.


Source Information

From Brown University School of Medicine and Rhode Island Hospital, Providence (A.E.B.); Duke University Clinical Research Institute, Durham, N.C. (K.L.L., G.H.); Michigan Heart, Ann Arbor (L.D.); the University of Maryland School of Medicine, Baltimore (M.R.G.); Arkansas Cardiology Clinic, Little Rock (G.S.G.); Northside Cardiology, Indianapolis (E.N.P.); Midwest Heart Research Foundation, Lombard, Ill. (M.F.O.); the University of Ottawa Heart Institute, Ottawa, Ont., Canada (A.T.); Montefiore Medical Center and Albert Einstein School of Medicine, Bronx, N.Y. (J.D.F.); Columbia University School of Medicine, New York (J.C.); and the Montreal Heart Institute, Montreal (M.T.).

Address reprint requests to Dr. Buxton at the Division of Cardiology, Rhode Island Hospital, 2 Dudley St., Suite 360, Providence, RI 02905.

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Related Letters:

Electrophysiologic Testing to Identify Patients at Risk for Sudden Death
Meissner M. D., Lieberman R. A., Buxton A. E., Lee K. L.
Extract | Full Text  
N Engl J Med 2000; 343:1813-1814, Dec 14, 2000. Correspondence

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