Effects of dobutamine stress on dyssynchrony, hemodynamics and device settings optimization in CRT patients

Abstract

Daily level exercise in CRT patients results in a shorter optimal programmed AV delay and shorter intrinsic AV interval compared to the resting state. The optimal programmed VV delay and intrinsic VV intervals are not significantly affected and ventricular dyssynchrony shows heterogeneous responses to exercise. Optimal programming of the AV delay is more crucial during exercise than at rest