Common complications of coronary heart disease and acute myocardial infarction include: 1. papillary muscle dysfunction or rupture; 2. cuspidal papillary muscle contraction dysfunction due to ischemia, necrosis, etc., resulting in varying degrees of mitral valve prolapse and incomplete closure; 3. cardiac rupture: often occurs within 1 week of myocardial infarction, mostly due to rupture of the free wall of the ventricle, resulting in sudden death due to pericardial blood accumulation causing acute cardiac compression; 4. embolism: left ventricle The embolism is caused by the dislodgement of the thrombus of the appendage wall, resulting in embolism of the brain, kidney, spleen, or arteries of the extremities; 5.Ventricular wall tumor: mainly seen in the left ventricle, the physical examination shows the enlargement of the left heart border and a wide range of heart beats; 6.Post-myocardial infarction syndrome: it appears within weeks to months after myocardial infarction and can occur repeatedly, manifesting as pericarditis, pleurisy or pneumonia with fever and chest pain, which may be the organism’s Allergic reaction.