Counterpulsation

When the heart contracts, the anterior wall of the left ventricle hits the chest wall of the anterior region early in the contraction, causing the intercostal tissue of the corresponding part to pulsate outward, which is called apical pulsation. After left ventricular myocardial infarction, the myocardium of the ventricular wall was necrotic. In about 10 to 38% of cases, the necrotic myocardium is gradually replaced by fibrous scar tissue, forming a wall tumor. The thin ventricular wall of the lesion area bulges outward, and loses its ability to move or exhibits abnormal movement when the heart contracts. As early as 1881, the evolution of coronary artery obstruction, myocardial infarction, myocardial fibrosis, and left ventricular wall tumor was fully understood.