Figure 1: Functional Effects of ISO Alone

Echocardiographic strain data derived from apical myocardial motion in (A) pre-treated state and (B) 24-h post-injection of isoproterenol (ISO). Post-ISO analysis showed marked impairment of apical radial strain. Ant = anterior; AntSept = anteroseptal; AVC = aortic valve closure; Inf = inferior; Lat = lateral; Post = posterior; SAX-AP = short axis-apex; Sept = septal; SR = strain rate.