Pathophysiology of Myocardial Infarction
In Myocardial Infarction, inadequate coronary blood flow rapidly results in myocardial ischemia in the affected area. The location and extent of the infarct determine the effects on cardiac function. Ischemia depresses cardiac function and triggers autonomic nervous system responses that exacerbate the imbalance between myocardial oxygen supply and demand. Persistent ischemia results in tissue necrosis and scar tissue formation, with permanent loss of myocardial contractility in the affected area. Cardiogenic shock may develop because of inadequate CO from decreased myocardial contractility and pumping capacity.