Lack of Association Between Intraoperative Hypotension and Postoperative Acute Kidney Injury in Patients Undergoing Pancreaticoduodenectomy: A Retrospective Cohort Study.

Background: Acute kidney injury (AKI) is a common postoperative event. Previous research suggests that intraoperative hypotension (IOH) is associated with postoperative AKI. This connection, however, has not been studied in patients undergoing pancreaticoduodenectomy. Methods: Based on a retrospective cohort study, we analyzed 844 adult patients who had pancreaticoduodenectomy between December 2016 and June 2020 in Henan Provincial People's Hospital. We graphically modeled the associations between the lowest intraoperative systolic and diastolic pressure and AKI using a restricted cubic spline with all covariates adjusted. The association between time under the above-specified systolic blood pressure (SPB) and diastolic blood pressure (DBP) thresholds and AKI, respectively, was investigated using logistic regression models. We further tested the robustness of our findings with a sensitivity analysis. Results: AKI occurred in 98 (11.6%) of the 844 patients in this cohort. Blood pressure components below the thresholds of 100 mmHg for systolic and 60 mmHg for diastolic were visual change points associated with increasing odds of AKI. The median (IQR) time under SBP < 100 mmHg was 15.0 (0, 40) min and 65.0 (18.8, 105.4) min for DBP < 60 mmHg. Time spent under the threshold of SBP less than 100 mmHg and DBP less than 60 mmHg was not significantly associated with AKI. Conclusions: We found no relationship between IOH and postoperative AKI after pancreaticoduodenectomy. More research is needed to investigate the complex aspects influencing intraoperative blood management in order to lessen the occurrence of AKI.