[Comparative study of left coronary artery of 128 necropsies with myocardial infarction].

The main portion of left coronary artery is located close to the beginning of its anterior descending branch, which is intimately correlated with blood supply to the heart muscle. In this paper, 128 necropsy cases were collected and analysed for detecting the incidence of atherosclerotic plaques and the relationship between the left main portion and the other three main branches of the coronary artery. From the data collected, the atheromatous plaques at the left main portion was 16.4%. The morbidity was 95.2% at the anterior descending branch, and 100% at the right circumflex branch. Besides, the incidence of acute transmural myocardial infarction was also lower than that of the old myocardial infarction obtained in those cases with atheromatous lesion of 3rd degree occlusion at the left main portion of the coronary artery. Anyhow, no obvious difference was found about the complications of myocardial infarction between the left main portion, and the other three main branches. Additionally, thrombi were present in three other branches in 66 cases, but none was detected in the left main portion of the coronary artery. The cause is still remaining to be clarified.