Coronary Bypass Occlusion and Predisposing Factors

Abstract

Background: Coronary artery bypass graft (CABG) failure may result in a wide range of problems. Objectives: The aim of the present study was to evaluate failure rate and risk factors in coronary bypass grafts. Patients and Methods: In this cross-sectional study, 250 post-CABG patients in Baqiyatallah hospital, Tehran, Iran in 2004 2014 were evaluated. Graft failure rate and predisposing factors were evaluated. Results: In this study, 250 patients with the mean age of 64.50 ± 7.63 years were evaluated. LIMA (left internal mammary artery) to LAD (left anterior descending artery) was patent in 187 patients (82.6%), SVG (saphenous vein graft) to OM (obtuse marginal artery) in 159 patients (81.9%), SVG to RCA (right coronary artery) in 49 patients (50.5%) and SVG to PDA (posterior descending artery) in 90 patients (68.2%). Lowest patency was in the right coronary artery and maximum patency in the left anterior descending artery. LIMA/SVG patency rates in 1 5 years, 5 10 years and over 10 years after CABG were 77.4%/92.7%, 81.5% / 71.6% and 100%/92.7%, respectively. Male gender, BMI > 30, diabetes, hypertension, hyperlipidemia and smoking were related to higher graft failure rate (P = 0.001). Conclusions: The LIMA grafts had the highest late patency rate, but were associated with a high rate of short-term occlusions. Also we found that patients with successful CABG and patent coronary were those who had less predisposing factors.