Risk factors for in-hospital mortality after coronary artery bypass grafting in Colombia.

Abstract

The aim of this study was to determine the factors associated with in-hospital mortality after a coronary artery bypass (CABG) in a high-complexity clinic in the city of Santiago de Cali, Colombia. A retrospective case-control analytical study was performed. Cases were defined as adult patients that had undergone CABG and died within 30 days of the surgery. Patients aged ≥18 years that had undergone isolated surgeries were included, i.e. procedures without other interventions combined. Patients were excluded from this study if: 1) they had missing data in their medical records; 2) they had previously been in a state of coma; or 3) they had previously undergone cardiac surgery other than a bypass procedure. Exposure variables were measured at three stages: preoperative, intraoperative, and postoperative. The study included 77 cases and 308 controls. The most common cause of death was cardiogenic shock (53.2%), followed by sepsis (27.3%). The multinomial logistic regression model revealed an association of in-hospital mortality with preoperative variables of age >75 years (odds ratio [OR] 2.5, 95% confidence interval [95% CI]: 1.1-5.8, P=0.032), low socioeconomic status (OR=2.3, 95% CI: 1.1-5.2, P=0.034), heart failure (HF) (OR=3.2, 95% CI: 1.5-7.0, P=0.002), unstable angina (OR=4.2, 95% CI: 1.9-9.0, P=0.000), acute myocardial infarction (AMI)≤7 days (OR=3.9, 95% CI: 1.1-13.7, P=0.037), chronic kidney insufficiency (CKI) (OR=2.9, 95% CI: 1.2-7.0, P=0.018), peripheral vascular disease (PVD) (OR=2.8, 95% CI: 1.2-6.8, P=0.019), and urgent/emergent surgery (OR=8.2, 95% CI: 2.0-34.5, P=0.004). Of the intraoperative variables, the model showed an association between the use of inotropic agents (OR=2.8, 95% CI: 1.3-6.4, P=0.011) and cardiogenic shock (OR=50.6, 95% CI: 7.5-339, P=0.000). This study identifies the factors during preoperative and intraoperative periods that are associated with in-hospital mortality in patients that have undergone CABG.