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  • Title: Secondary prevention of cardiac events following myocardial infarction: effects of atenolol and enalapril. Beijing Collaborative Study Group.
    Author: Wu N, Fan Z.
    Journal: Chin Med J (Engl); 1997 Aug; 110(8):602-6. PubMed ID: 9594263.
    Abstract:
    OBJECTIVE: To investigate the actions of beta-blocker (atenolol) and ACE inhibitor (enalapril) for the secondary prevention of the main cardiac complications after acute myocardial infarction (AMI). METHODS: 1106 cases of AMI from 7 hospitals in the Beijing area were collected and were divided randomly into three groups: control (group C), atenolol (group A), and enalapril (group E). Drugs for investigation were administered 2-4 weeks after the onset of AMI, and the subjects were followed up for a median period of 19 months. All patients were given aspirin 50 mg/day. The end points of observation were cardiac events and non-cardiac events. Cardiac events included sudden cardiac death (SCD), heart failure death, total cardiac deaths, and myocardial re-infarction. RESULTS: The clinical conditions of the three groups were compatible. Sixty-six cardiac events (6.0%) occurred. Comparing with group C, the rate of SCD decreased significantly by 68% in group A after atenolol treatment for 28 months. Both atenolol and enalapril significantly increased left ventricular ejection fraction (LVEF), whereas in group C the LVEF did not change during the follow-up period. There was obvious decreasing tendency of the survival curve in group C, compared with the other two groups. Totally drugs decrease one cardiac death 0/00/month. But the rate of myocardial re-infarction was the same in the three groups. No serious side effects on blood pressure or heart rate were observed. CONCLUSIONS: Both atenolol and enalapril (domestic products) are beneficial to the secondary prevention of SCD and heart failure death after AMI, but not to re-infarction. Both drugs should be continued for a prolonged period to be effective. Drugs given 2-4 weeks after acute stage are also effective, with no serious side effects.
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