MORTALITY RATES IN ACUTE MYOCARDIAL INFARCTION. IV. THE SEASONAL VARIATION IN MORBIDITY AND MORTALITY

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Abstract
A study of 930 patients with acute myocardial infarction admitted to 2 hospitals in this southern city revealed that a significantly greater number of patients with acute myocardial infarction were hospitalized in the winter than in any other season of the year. An analysis of 3971 deaths from acute myocardial infarction reported to the Houston Health Department from 1947 to 1952 disclosed that the largest number (29%) occurred during the winter months and the smallest number (22%) during the summer. These findings, which indicate that both the incidence and the number of deaths are highest in the winter, confirm earlier reports from various sections of this country, and do not support the contention of a "reversed" seasonal incidence of this disease in the South.