Enhanced external counterpulsation (EECP) is a noninvasive outpatient therapy for the treatment of chronic angina.EECP treatment produces an acute hemodynamic effect that is similar to that produced by the invasive intra-aortic balloon pump.Three sets of cuffs on the upper thigh,lower thigh,and calves of each leg are inflated with compressed air during the diastolic phase of the cardiac cycle and are deflated in early systole.This rapid inflation and deflation raises diastolic aortic pressure,increases coronary perfusion pressure,and provides improved afterload reduction and increased venous return with a subsequent increase in cardiac output.