BackgroundPerioperative diabetes insipidus (DI) is a serious complication occurring in patients undergoing off-pump coronary artery bypass grafting (OPCABG). MethodsThis was a retrospective study of 199 patients who underwent OPCABG surgery in Anzhen hospital, Beijing, China, between January 2019 to December 2019. Patients were divided into a DI(+) group and a DI(-) group according to perioperative urine condition. The incidence of perioperative DI in patients undergoing OPCABG surgery was calculated as the main outcome. Multivariable binary logistic regression analysis was used to identify independent prognostic factors of DI.ResultsPerioperative DI occurred in 43.2% (86/199) of these patients. Mean patient age was 62.5 ± 9.0 years, and 156 (78.4%) were male. Multivariable logistic regression analysis showed a correlation between BMI(OR=0.772, 95%CI[0.670-0.890], P＜0.001), Crystal quantity(OR=1.001, 95%CI[1.000-1.001], P=0.008), perioperative Cr(OR=0.965, 95%CI[0.937-0.993], P=0.016). The DI(+) group had a significantly higher imbalance postoperative PH condition(41.9% vs 28.3%, P<0.05), higher median mechanical ventilation time than the DI(-) group (22.0 vs. 20.5, P<0.01) and higher median of ICU stay hours(27.0 vs 31.0, P=0.041).ConclusionCoronary artery disease(CAD) patients underwent OPCABG surgery were easy to have perioperative DI, which had a higher ICU stay and mechanical ventilation time than those without DI. BMI, Crystal quantity, perioperative creatinine was associated with the presence of DI. Prospective studies are needed to validate these findings.