SUMMARYFour hundred patients who were admitted over the last three years with myocardial infarction were questioned about the presence and pattern of angina before its onset. Two hundred and twenty-four (56 per cent) patients had angina before their infarction; 184 (46 per cent) had the unstable pattern of angina. That such a high proportion of patients experience unstable angina as a prodromal symptom makes it possible that myocardial infarction could be prevented in some of these patients. Patients with previous angina had a higher incidence of subendocardial infarction than patients without angina (stable or unstable) (p<0. 01). In-hospital prognosis was better in patients with chronic or unstable angina than in patients without angina (p<0. 05).
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