To the Editor: Griffith et al. (N Engl J Med 288:589, 1973) documented improvement in symptoms and exercise performance after saphenous-vein coronary bypass graft surgery in two groups of subjects: those with occlusion of all bypass grafts and occlusion of the segments of the intrinsic coronary circulation to which these grafts were connected; and those with patent bypass grafts with or without changes in the intrinsic coronary circulation. The authors state that improvement in the first group can reasonably be attributed to infarction of a previous ischemic segment or to nonspecific effects of surgery. Improvement in the second group, they.
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