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Enhanced external counterpulsation (EECP) is a noninvasive technique that provides beneficial effects for patients with chronic,symptomatic angina pectoris.However,the direct left ventricular effects of EECP have not been studied invasively.We examined invasive right atrial pressure and leR ventricular hemodynamics during EECP.Ten patients referred for diagnostic evaluation underwent left heart catheterization from the radial artery.At baseline and during EECP,left ventricular pressure and volume were measured using a micromanometer pressure-conductance catheter,along with recording of right atrial and central aortic pressures.