Objective: To determine correlation of echo-doppler optimization of atrioventricular delay in cardiac resynchronization therapy with left ventricular invasive hemodynamics optimization. Methods: Intervention prospective study. Result: In 25 patients (48% female, mean age 6.1±10.6, had diagnosis heart failure NYHA IIIV with LVEF= 26.9±5.7%, sinus rhythm, QRS wide is 170±22.1 ms) who underwent CRT.