Statistical Observation on Myocardial Infarction

1) There were 104 cases of myocardial infarction during the period from 1951 to 1967. Male patients were twice as much of female. The mortality rate of this series was ca 50% at the end of 1968. This rate was markedly high compared with the mortality rate of the same series, that is 20%, at the period of 1 year after admission. 2) Severe or unusual cases; These cases were, in order of frequency, rhythm disturbance, septal infarction, death of acute coronary insufficiency and atrial infarction. The mortality rate was high in all of them. In acute coronary insufficiency, syphilis was the cause in the half of cases, coronary sclerosis or coronary stenosis were severe and the weight of the heart were increased. 3) Complicated cases: They were, in order of frequency, infectious disease infarction of the other organs, brain disease, endocrine disorders and lung disease. The mortality rates were high in all but rheumatism and disease of digestive system. are low In the cases of combined infarctions, there were many lung infarctions, and almost of them died. Thrombo-emboli in combined infarctions were found in only two cases of liver cirrhosis and two cases of respiratory disease. 4) Complaints in myocar dial infarction: Almost half cases of myocardial infarction complained of anginal symptoms, and the half cases of them complained of only slight chest pain. 5) The accuracy of diagnosis in myocardial infarction: The diagnosis of myocardial infarction was correct in about half cases. In another half of cases, myocardial infarction was misdiagnosed as other cardiac diseases. 6) Interesting cases were as follows: (1) Q3 T3 figure in a case of a combined myocardial and lung infarction. (2) Q, ST, T variations in V4R-V6 followed by a heart rupture. (3) Three cases of so-called S1, S2, S3 pattern. They were a case of right atrial and ventricular infarction, a case of right ventricular infarction with cor pulmonale, and a case of septal infarction with r.b.b.b. (4) Unordinary exercise EKG figure. The first case was a patient comlaining of squeezing sensation of the chest and pain in the right chest with r.b.b.b. and figure of posterior infarction. On exercise test after admission a negative T in V3, V5 turned to positive without symptom of angina. The patient died cf interior infarction after 8 months. The second case admitted to the hospital 3 days after having squeeze sensation of the chest with a coronary T in V2-5. Exercise test after 1 month showed ST elevation in V