Influence of Procedural Success on Immediate and Long-Term Clinical Outcome of Patients Undergoing Percutaneous Revascularization of Occluded Coronary Artery Bypass Vein Grafts

Abstract

ObjectivesThis study sought to determine whether successful recanalization of an occluded vein graft is associated with improvement in long-term clinical outcome. BackgroundCoronary angioplasty of occluded vein grafts is associated with a lower initial success rate and a higher complication rate than angioplasty of vein grafts with subtotal stenoses and native coronary arteries. Whether successful angioplasty improves clinical outcome is unknown. MethodsWe analyzed 77 consecutive patients who underwent angioplasty of an occluded saphenous vein coronary artery bypass graft between August 1983 and June 1994. Patients with a myocardial infarction in the previous 24 h were excluded from the study. ResultsThe mean age of the study cohort was 65 years; the mean (±SD) age of the treated grafts was 7.5 ± 3.9 years. As an adjunct to balloon angioplasty, stents were used in 9% of procedures, laser in 30%, and atherectomy in 16%, and thrombolytic therapy was administered in 23% of patients. The angioplasty success rate was 71%. Major complications within 30 days of the procedure included death in 5.2% of patients, Q wave myocardial infarction in 1.3% and repeat bypass surgery in 7.8%; these events occurred with similar frequency in patients in whom angiographic success was and was not achieved. Kaplan-Meier analysis comparing patients in whom angioplasty was successful (n = 55) and not successful (n = 22) revealed no differences in survival or occurrence of myocardial infarction or recurrent severe angina between the two groups in the 3 years after the procedure. Univariate analysis identified the age of the graft and use of newer interventional devices as predictors of death or myocardial infarction during this time period; procedural success was not associated with freedom from these adverse events after adjusting for these variables. ConclusionsAngioplasty of occluded vein grafts is associated with a low initial success rate and a high complication rate. Successful angioplasty does not appear to reduce the occurrence of adverse events in the 3 years after the procedure.