In order to evaluate the effect of coronary care on the immediate mortality rate of acute myocardial infarction and to clarify the problems in coronary care, we attempted to investigate the immediate mortality rate and causes of deaths in 492 patients with acute myocardial infarction who had admitted to the hospital within 24 hours after the onset of infarct from January, 1972 to December, 1981. Three hundred and seventy-nine were men and 113 were women, and their mean age was 61.8 years ranging from 28 to 91 years. One hundred and twenty-seven patients had a previous history of myocardial infarction and 365 patients had none. One hundred and ninety patients of these 365 patients without a previous infarction had anterior infarction, 152 patients inferior infarction and 23 patients subendocardial infarction. All patients were subdivided into four stages according to the time of the onset of infarct: Stage 1 (29 patients); 1972-1975, Stage 2 (101 patients); 1976-1977, Stage 3 (148 patients); 1978-1979 and Stage 4 (214 patients); 1980-1981. No significant differences in age, sex and infarct site among the four periods were found. Time interval between the onset of infarct and admission shortened serially and the ratio of reinfarction to initial infarction increased. Immediate mortality rate (within four weeks after the onset of infarct) was 20.5% in all patients. Immediate mortality rate in Stage 1 was 24.1%, 26.7% in Stage 2, 23.0% in Stage 3 and 15.4% in Stage 4, respectively. Thus, this finding indicates that the immediate prognosis in patients with acute myocardial infarction who admitted to the hospital in recent two years improved markedly. Immediate prognosis in elderly patients was worse than that in younger patients. However, serial improvement in the immediate prognosis in elderly patients was observed. Similarly, immediate mortality rate in patients complicated with a large infarct or congestive heart failure was higher than that in those without a large infarct and no congestive heart failure. Although the immediate prognosis in patients with previous infarction was worse than that in those without previous infarction, the immediate prognosis in patients with previous infarction improved serially. Pump failure was the most common cause of death, accounting 55.4% of all deaths. The incidence of cardiac rupture was 20.8% of all deaths, arrhythmias 13.9% and other causes 9.9%, respectively. Serial analysis of cause of death indicates that the incidence of pump failure and arrhythmia reduced sharply. This reduction in mortality rate may be due to improved management in our CCU.
- Acute Myocardial Infarction
- Cause of Death
- Immediate Prognosis
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine