Abstract 14811: A Clinical Risk Scoring Tool to Predict Readmission After Discharge From Cardiac Surgery: An Administrative and Clinical Database Study

Introduction: Reducing readmission after cardiac surgery remains a quality improvement priority. Most readmission risk models examine only coronary artery bypass grafting (CABG). We elucidate the pre- and peri-operative risk factors for readmission after CABG and/or valve surgery using administrative databases in Ontario, Canada. Methods: Adults >18 years undergoing isolated CABG, isolated/multiple valve (aortic, mitral or tricuspid) or combined CABG/valve surgery from 2008-2016 in Ontario were eligible. Risk factors for 30-day readmission after discharge were obtained through linkages of Ontario administrative databases. Hazard ratios for risk factors were calculated using Cox proportional hazards regression. We developed a clinical risk scoring tool weighted by beta-coefficients from the final model. Discrimination and calibration was performed using c-statistics and comparing the predicted to observed probabilities across deciles of predicted risk. Results: 63,336 patients underwent CABG and/or valve s...