- Effects of maximal exercise stress on left ventricular function in patients with coronary artery disease using first pass radionuclide angiocardiography: a rapid, noninvasive technique for determining ejection fraction and segmental wall motion. Jengo, J.A., Oren, V., Conant, R., Brizendine, M., Nelson, T., Uszler, J.M., Mena, I. Circulation (1979)