Risk factors for prolonged hospital stay after isolated coronary artery bypass grafting Fatores de risco para tempo de internação prolongada após revascularização isolada do miocárdio

Introduction: Characteristics of the patient and the coronary artery bypass grafting may predispose individuals to prolonged hospitalization, increasing costs and morbidity and mortality. Objective: The objective of this study was to evaluate individual and perioperative risk factors of prolonged hospitalization in intensive care units and wards. Methods: We conducted a case-control study of 104 patients undergoing isolated coronary artery bypass grafting with cardiopulmonary bypass. Patients hospitalized >3 days in the intensive care unit or >7 days in the ward were considered for the study. The association between variables was estimated by the chi-square test, odds ratio and logistic regression; P ≤0.05 was considered statistically significant. Results: Hospital stay >3 days in the intensive care unit occurred for 22.1% of patients and >7 days in the ward for 27.9%. Among preoperative factors, diabetes (OR=3.17) and smoking (OR=4.07) were predictors of prolonged intensive care unit stay. Combining the pre-, intra-and postoperative variables, only mechanical ventilation for more than 24 hours (OR=6.10) was predictive of intensive care unit outcome. For the ward outcome, the preoperative predictor was left ventricular ejection fraction <50% (OR=3.04). Combining preand intraoperative factors, diabetes (OR=2.81), and including postoperative factors, presence of infection (OR=4.54) were predictors of prolonged hospitalization in the ward. Conclusion: Diabetes and smoking were predictors of intensive care unit outcome, and ejection fraction <50% of ward outcome. For the set of perioperative factors, prolonged hospitalization after isolated coronary artery bypass grafting was associated with mechanical ventilation >24 hours for the intensive care unit and presence of infection for the ward. Descriptors: Risk factors. Myocardial revascularization. Hospitalization. Resumo Introdução: Características do paciente e da cirurgia de revascularização do miocárdio podem predispor à internação prolongada, aumentando custos e a morbimortalidade. Objetivo: Avaliar fatores de risco individuais e transoperatórios para internação prolongada na unidade de terapia intensiva e na enfermaria.