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The recent introduction of electrocardiographic mapping permits measurement of the precordial area and severity of exercise-induced S-T segment changes. This study was designed to compare this technique with a modified 12 lead electrocardiogram in defining the degree and site of coronary artery disease. One hundred patients, who later had diagnostic(More)
A technique is described for recording the precordial electrocardiographic body surface map before and after exercise. The technique provides an extra dimension to the conventional exercise electrocardiogram because a measurement can be made of the area and severity of S-T segment changes that are projected onto the front of the chest. Sixteen lead(More)
Many workers have shown that the cardiac output in normal man is less in the upright than in the recumbent position (McMichael and SharpeySchafer, 1944; Stead et al., 1945; Coe, Best, and Lawson, 1950; Wang, Marshall, and Shepherd, 1960; Chapman, Fisher, and Sproule, 1960; Reeves et al., 1961). The physiological events underlying this change are complex and(More)