[Respective diagnostic value of CM5 and V5 leads in exercise tests. Comparative study of 100 cases]

The respective diagnostic values of CM5 and V5 leads in exercise tests were studied in 100 patients, 89 of whom had coronary disease. Mean maximum ST depression and mean R wave amplitude at rest and at peak exertion were very much greater with CM5 than with V5 (p less than 0.0001). These two parameters seemed to vary concurrently. The contribution of both leads to the diagnosis in terms of sensitivity is probably the same; the more severe the coronary disease, the more pronounced the ST depression on CM5 tracings as compared to V5 tracings. A significant ST depression (1 mm) also appears more rapidly on the bipolar MC5 lead.