• Hui Zhang, Taoyuan Zhang, Lihong Hou, Jing Zhao, Qianqian Fan, Lini Wang, Zhihong Lu, Hailong Dong, and Chong Lei.
• Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Xi'an, 710032, China.
• BMC Anesthesiol. 2023 Sep 19; 23 (1): 319319.

BackgroundThe association between tissue oxygenation with postoperative acute kidney injury (AKI) in adult patients undergoing multiple valve surgery has not been specifically studied.MethodsIn this prospective exploratory cohort study, 99 patients were enrolled. The left forehead, the left forearm, the left upper thigh, and the left renal region tissue oxygen saturation using near-infrared spectroscopy were monitored. The association between each threshold and AKI was assessed. The relative and absolute thresholds were < 70%, < 75%, < 80%, < 85%, < 90%, < 95%, and < 100% baseline, and baseline-standard deviation (SD), -1.5 SD, -2 SD, -2.5 SD, and -3 SD. Multivariate logistic regression analysis was adopted to explore the association.ResultsAKI occurred in 53 (54%) patients. The absolute value-based SrrO2 thresholds associated with AKI were baseline-3 SD (odds ratio [OR], 4.629; 95% confidence interval [CI], 1.238-17.314; P = 0.023) and baseline-2.5 SD (OR, 2.842; 95% CI, 1.025-7.881; P = 0.045) after adjusting for the potential confounders, those are renal region tissue oxygen saturation of 55% and 60%, but not statistically significant after correcting for multiple testing (corrected P = 0.114 and 0.179, respectively).ConclusionThe SrrO2 desaturation, defined as < baseline - 2.5 SD or < baseline - 3 SD, may be associated with AKI. The thresholds need to be verified in future large-scale studies.Trial RegistrationsThe study was registered at ClinicalTrials.gov, first trial registration: 26/10/2017, identifier: NCT03323203.© 2023. BioMed Central Ltd., part of Springer Nature.

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