Association of Intraoperative Hypotension with Acute Kidney Injury after Elective Noncardiac Surgery
2015/07/16 by Louise Y. Sun, Duminda N. Wijeysundera, Gordon A. Tait +1 · 35 citations
Medicine · #Hemodynamic Monitoring and Therapy #Cardiac, Anesthesia and Surgical Outcomes #Intraoperative Neuromonitoring and Anesthetic Effects
paper · pdf · doi:10.1097/aln.0000000000000765
Abstract
AbstractAbstract In a retrospective study of 5,127 patients undergoing noncardiac surgery, an increased risk of postoperative acute kidney injury (defined as >50% or 0.3 mg/dl increase in serum creatinine concentration) was found when intraoperative mean arterial pressure was less than 60 mmHg for more than 20 min and less than 55 mmHg for more than 10 min. Supplemental Digital Content is available in the text. Background: Intraoperative hypotension (IOH) may be associated with postoperative acute kidney injury (AKI), but the duration of hypotension for triggering harm is unclear. The authors investigated the association between varying periods of IOH with mean arterial pressure (MAP) less than 55, less than 60, and less than 65 mmHg with AKI. Methods: The authors conducted a retrospective cohort study of 5,127 patients undergoing noncardiac surgery (2009 to 2012) with invasive MAP monitoring and length of stay of 1 or more days. Exclusion criteria were preoperative MAP less than 65 mmHg, dialysis dependence, urologic surgery, and surgical duration less than 30 min. The primary exposure was IOH. The primary outcome was AKI (50% or 0.3 mg/dl increase in creatinine) during the first 2 postoperative days. Multivariable logistic regression was used to model the exposure–outcome relationship. Results: AKI occurred in 324 (6.3%) patients and was associated with MAP less than 60 mmHg for 11 to 20 min and MAP less than 55 mmHg for more than 10 min in a graded fashion. The adjusted odds ratio of AKI for MAP less than 55 mmHg was 2.34 (1.35 to 4.05) for 11- to 20-min exposure and 3.53 (1.51 to 8.25) for more than 20 min. For MAP less than 60 mmHg, the adjusted odds ratio for AKI was 1.84 (1.11 to 3.06) for 11- to 20-min exposure. Conclusions: In this analysis, postoperative AKI is associated with sustained intraoperative periods of MAP less than 55 and less than 60 mmHg. This study provides an impetus for clinical trials to determine whether interventions that promptly treat IOH and are tailored to individual patient physiology could help reduce the risk of AKI.
Citations
Cited by
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