Abstract
Analysis of clinical response, graft patency, and treadmill performance was carried out in 72 patients one year after aortocoronary saphenous vein bypass surgery. Thirty-four of 46 patients with complete relief of angina had all grafts patent at one year, as opposed to 4 of 14 unimproved patients ( P < 0.01); 84.4% of 77 grafts in the former group were patent, as compared with 48% of 25 grafts in the latter group ( P < 0.01). Similarly, treadmill tolerance and end-exercise heart rate were significantly increased in patients experiencing significant or complete clinical relief. Unimproved patients showed no improvement in these parameters. Individual observations indicated that graft patency did not always ensure clinical relief or abolition of ischemic treadmill responses.
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