Follow-up study of patients with aorto-coronary saphenous vein bypass. Comparison between recoronarography and ultrasonic "Doppler" technique.
D017023:Coronary Angiography; D001026:Coronary Artery Bypass; D004301:Doppler Effect; D005500:Follow-Up Studies; D006801:Humans; D012212:Rheology; D014463:Ultrasonography