To the Editor: In the February 25th issue, Kent and his colleagues documented improved myocardial function during exercise among 38 of 59 patients having percutaneous transluminal coronary angioplasty. 1 Unfortunately, the criteria used to select patients for this procedure (or to exclude them) were not stated. The severity of symptoms and the degree of functional disability leading to coronary arteriography were not documented. The location, morphology, and range of severity of the arterial obstructions were not defined. No discussion of the angiographic techniques used to measure luminal diameter was given. What is the confidence level for detection of a 20 per.
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