Two hundred fifty patients were enrolled in a multicenter, community-based study of the efficacy of intracoronary streptokinase thrombolysis in acute myocardial infarction; 134 were randomly assigned to streptokinase therapy and 116 were controls. All patients underwent left ventricular angiography and coronary arteriography before the random assignment. The mean time from the onset of symptoms to hospitalization was 134 +/- 144 minutes (S.D), and the mean time to random assignment was 276 +/- 185 minutes. Coronary reperfusion was achieved in 68 per cent of the streptokinase-treated group. The overall 30-day mortality was 18 (7.2 per cent); there were five deaths in the streptokinase-treated group (3.7 per cent) and 13 in the control group (11.2 per cent, P less than 0.02). Fifteen of the 18 deaths occurred in patients with anterior infarction. Intracoronary streptokinase therapy resulted in a nearly threefold reduction in the 30-day mortality after hospitalization for acute myocardial infarction.
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