Patients with myocardial infarctions may show a paradoxic precordial outward systolic movement that can be recorded by the kineto-cardiographic technic and often is felt at the bedside.Three types of changes occur. The first is an early systolic outward movement, which is abnormally long in duration but not sustained throughout systole. The second is a sustained outward movement during systole called a “bulge,” and the third is a late systolic outward movement.Bulges can be recorded in approximately two thirds of the patients with known infarctions with the largest outward movement most frequently noted in or near the V3area.A few patients with angina may have a bulge at rest; however, apparently about 30 per cent develop a bulge on exercise.