Hospital lethality was studied in myocardial infarction which was 24.9 per cent for the period 1973--1976 with a decreasing tendency during the last two years. The study covers 134 deceased of myocardial infarction at an average age of 70,78, their pathologoanatomical findings in the coronary arteries and localization of the nectrotic zone. In 49,26 per cent the case was that of repeated myocardial infarction, thus raising the lethality in the first 24 hours after hospital admission with 70,9 dead up to the 7th day. The analysis of the lethality causes revealed that according to the relative share they were as follows: acute cardiovascular failure, cardiac rupture, acute rhythm and conductivity disturbances, pulmonary embolism, inflammatory lung diseases, etc. No correlation was found between arterial hypertension, cigarette smoking and diabetes mellitus and the leading lethality cause.