Usefulness of isometric hand grip exercise in detecting coronary artery disease during dobutamine atropine stress echocardiography in patients with either stable angina pectoris or another type of positive stress test. - Afridi I; Main ML; Parrish DL; Kizilbash A; Levine BD; Grayburn PA; Afridi, I; Main, M L; Parrish, D L; Kizilbash, A; Levine, B D; Grayburn, P A (American Journal of Cardiology, 1998)