Effect of Previous Stent Implantation in Elective Coronary Artery Bypass Grafting Operation; Multivariate Analysis of 1,259 Patients: Retrospective Clinical Trial

Abstract

Objective: This study aims to investigate the effect of previous stent implantation on early mortality in patients undergoing elective coronary artery bypass grafting (CABG). Material and Methods: A total of 1,259 patients who underwent elective isolated CABG between January 2015 and December 2016 were included. There were 970 patients in the CABG without stent group and 289 patients in the CABG with stent group. Preoperative, intraoperative, and postoperative data of both groups were compared. Predictors of early mortality in CABG were examined using the logistic regression analysis. Results: Early mortality rates after surgery between the groups were similar (CABG without stent group vs. CABG with stent group; 2.9% vs. 3.1%, p=0.998). The length of intensive care unit stay, the use of intraaortic balloon pump, tracheotomy, new dialysis, revision and the use of extracorporeal membrane oxygenator were also comparable between the groups (p>0.05). The mean number of grafts was significantly lower in the CABG with stent group than the CABG without stent group (2.62±0.91 vs. 2.87±0.9; p<0.001 respectively). Multivariate analysis revealed that an ejection fraction of ≤40% [odds ratio (OR): 3.8; 95% confidence interval (CI): 1.9-7.7; p<0.001], preoperative renal failure (OR: 3.7; 95% CI: 1.5-8.8; p=0.003), and advanced age (OR: 1.07; 95% CI: 1.03-1.1; p<0.001) were independent predictors of early mortality. Previous stent implantation has not been found out as a risk factor for early mortality (OR: 1.08; 95% CI: 0.5-2.3; p=0.998). Conclusion: Previous stent implantation was not found to be a factor affecting early mortality in patients undergoing elective CABG operations.