Perioperative risk factors for intensive care unit readmissions and mortality after cardiac surgery

Abstract Objective : The aim of this study was to identify perioperative risk factors associated with intensive care unit readmission and in-hospital death after cardiac surgery. Design : Retrospective analysis using a multivariable regression model to identify independent risk factors for ICU readmission and in-hospital mortality. Setting : The study was carried out in a single tertiary-care hospital. Participants : This was an analysis of 2789 adult patients. Interventions : All patients underwent cardiac surgery and were admitted to the intensive care unit perioperatively at the General Hospital Vienna. Measurements and Main Results : Among the 2789 patients included in the analysis, 167 (6%) were readmitted to the intensive care unit during the same hospital stay. Preoperative risk factors associated with ICU readmission included end-stage renal failure (odds ratio (OR) 2.80, 95% CI: 1.126-6.964), arrhythmia (OR 1.59, 95% CI: 1.019-2.480), chronic obstructive pulmonary disease (OR 1.51, 95% CI: 1.018-2.237), age > 80 (OR 2.55, 95% CI: 1.189-5.466), and EuroSCORE II > 8 (OR 1.40, 95% CI: 1.013-1.940). Readmitted patients were more likely to die than non-readmitted patients (OR 5.3, 95% CI: 3.284-8.558). In-hospital mortality in readmitted patients was 19.2%, whereas that in the non-readmitted study population was 5.1%. Conclusion : Preoperative risk assessment is crucial for identifying cardiac surgery patients at risk of ICU readmission and in-hospital death. The potentially modifiable risk factors pinpointed by our study call for the optimization of care before surgery and after ICU discharge.