2Schiller NB, Shah PM, Crawford M, et al. Recommen-dation for quantification of left ventricle by two-dimensiona echocardiography . J Am Soc Echocardiogra, 1989,2:358-367.
3Buda AJ, Lefkowitz CA, Gallagher KP. Augmentation of regioal function in nonischemic myocardium during coronary occlusion measured with twodimensional echocardiography . J Am Coll Cardiol,1990,19:1197.