RESUMO
STUDY OBJECTIVE: To determine the angiographic patency of cryopreserved saphenous vein grafts used as conduits during coronary artery bypass surgery and whether this is affected by postoperative immunosuppressive therapy. DESIGN AND SETTING: A retrospective review of medical records and coronary angiograms of patients at a university hospital. PATIENTS: Eleven patients undergoing 12 coronary artery bypass operations during which a total of 26 distal coronary anastomoses were created using cryopreserved vein grafts. MEASUREMENTS: Eight postoperative coronary angiograms were performed in 10 patients surviving longer than 1 week. All angiograms were performed on the basis of symptoms of suspected myocardial ischemia. Angiographic results, postoperative anticoagulation, and therapy with immunosuppressive agents were analyzed. RESULTS: Seventeen cryopreserved vein grafts were studied; one (6%) was patent, 12 (71%) were occluded, and 4 (23%) were stenosed. In patients treated with azathioprine, seven of the eight cryopreserved vein grafts were occluded. In patients not receiving immunosuppression, five were occluded, three were stenosed, and one was patent. All internal mammary grafts were widely patent. CONCLUSION: Cryopreserved vein grafts have a poor angiographic patency which did not appear to be affected by immunosuppressive therapy with azathioprine. The use of this graft should be restricted and alternative arterial conduits utilized.
