Fig. 6From: Speckle tracking echocardiography analyses of myocardial contraction efficiency predict response for cardiac resynchronization therapyFactors that influence contraction efficiency. a shows that when ECT is settled, different contraction velocities (slope) can result in different EC. b shows that when contraction velocity is settled, either late onset of contraction after AVO or early end of contraction before AVC may shorten ECT and decrease EC. ECT: effective contractile time; EC: effective contraction; AVC: aortic valve closure; AVO: aortic valve openingBack to article page