Does exercise-induced ST-segment depression predict benefit of medical intervention in patients recovering from acute myocardial infarction? The Danish Study Group on Verapamil in Myocardial Infarctio...


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  • Author:  E Steinmetz  

  • Abstract:  The present study tested the hypothesis that the increased risk in patients with exercise-provoked ST-segment depression recovering from acute myocardial infarction could by abolished by anti-ischaemic medical intervention. Prior to discharge a symptom-limited exercise test was carried out. Patients were then double-blindly randomized to treatment with either verapamil 120 mg t.i.d. or placebo, and observed for up to 18 months (mean 17 months). End-point was first major event; i.e. non-fatal reinfarction or death. Two-hundred-and-nine ty-eight patients were included. Forty-four patients with and 111 without exercise-induced ischaemia were randomized to verapamil and 39 and 104 respectively, to placebo. The overall number of events was 12.5%. In patients without ST-segment depression, 12.5% in the placebo group (hazard = 1) and 12.6% in the verapamil group (hazard = 1.13) had an event (NS). In patients with ST-segment depression 15.4% in the placebo group (hazard = 1.20) and 9.1% in the verapamil group (hazard = 0.85) had an event (NS). The latter reduction (41%) supports the hypothesis that patients with ST-segment depression, i.e. residual myocardial ischaemia, are those who benefit from anti-ischaemic intervention after myocardial infarction.

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