Copyright © 1996 by the European Society of Cardiology.
© 1996 The European Society of Cardiology
Long-term prognosis of patients after a Q wave compared with a non-Q wave first acute myocardial infarction
Data from the SPRINT Registry
Neufeld Cardiac Research Institute, Sheba Medical Center Tel Hashomer, Israel
revised 16 January 1996; accepted 15 February 1996.
S. Behar. MD, Heart Institute, Chaim Sheba Medical Center, Tel Hashomer, 52621, Israel.
Abstract
OBJECTIVE, DESIGN AND PATIENTS: Between August 1981 and July 1983, 5839 consecutive myocardial infarction patients were hospitalized in 13 coronary care units in Israel. The present study examines 10 year survival among 4037 consecutive patients with a first myocardial infarction with either Q or non-Q waves. Demographic and medical data were collected from hospital records, and 1 year clinical follow-up was complete for 99% of hospital survivors. Mortality follow-up was extended to June 1992 (mean 10 years of follow-up).
RESULTS: Five hundred and eighty patients (14%) had first myocardial infarctions of the non-Q wave type and 3457 of the Q wave type. Hospital mortality was significantly higher in patients with a Q wave (l0%) than those with a non-Q wave myocardial infarction (7%) (P<0·05). One year post-discharge, non-fatal reinfarction and mortality rates were comparable in patients with Q wave (4% and 7%) and non-Q wave myocardial infarctions (4% and 7% respectively). Similarly, 5 to 10 year post-discharge mortality rates were equally high in patients with a non-Q wave (26% and 44%) as in those with a first episode of a Q wave myocardial infarction (22% and 40% respectively).
CONCLUSIONS: Patients with a first non-Q wave acute myocordial infarction exhibited relatively better in-hospital survival than counterparts with a first Q wave infarction, but the advantage did not persist after discharge. Patients with a non-Q wave infarction deserve particular attention as their post-discharge mortality risk is similar to counterparts with a first Q wave myocardial infarction.
(Eur Heart J 1996; 17: 1532–1537)
Key Words: Non-Q wave MI • prognosis
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