Echocardiography is a most useful bedside tool to help in the diagnosis and management of critically ill patients after acute myocardial infarction. In most instances, the mechanism of unexplained shock will be elucidated. Transesophageal echocardiography can further delineate the mechanical complications of myocardial infarction when the transthoracic echocardiogram may not be adequate. This article will focus on the mechanical complications of myocardial infarction in patients who most often present with cardiogenic shock or acute pulmonary edema. Each clinical entity is discussed, and illustrative echocardiograms are provided.