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Sixty-two patients with acute myocardial infarction were treated for 4 days with bretylium tosylate. This agent was effective in suppressing and preventing ventricular fibrillation as well as other irritable arrhythmias and heart block. On admission 37 patients had arrhythmias and 2 complete atrioventricular (A-V) block; 23 had no rhythm disturbances and were treated prophylactically. Of the 37 patients...