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Enhanced external counterpulsation (EECP) is a noninvasive,counterpulsative method to provide temporary aid to the failing heart by sequentially inflating cuffs on the lower extremity out-of-phase with the left ventricle.Optimization of the method necessitates consideration of the hemodynamics created by EECP and the mode of action providing patient benefit.A computational model based on the governing one-dimensional equations is developed that simulates cardiovascular hemodynamics during EECP.The model includes a 30-element arterial system including the left ventricle,bifurcations,and peripheral arterial vessels.