Effects of positive end-expiratory pressure on regional cerebral oxygen saturation in elderly patients undergoing thoracic surgery during one-lung ventilation: a randomized crossover-controlled trial.

"data availability the datasets used and/or analyzed during the current study are available from the corresponding author upon reasonable request. declarations ethics approval and consent to participate the study protocol (kyll-202011"

"Declarations Ethics approval and consent to participateThe study protocol (KYLL-202011-021) was approved by the Ethics Committee of Scientific Research of Qilu Hospital of Shandong University, Jinan, China. The patients and/or their legal guardians obtained the signed informed consent before the research. Consent for publicationNot applicable. Competing interestsThe authors declare that they have no competing interests. Competing interests The authors declare that they have no competing interests."

"Funding This work was supported by Special funds for comfortable medical anesthesia optimization at Shandong Provincial Medical (YXH2021ZX015 to XY). China Postdoctoral Science Foundation (No. 2021M691944) to XY, and the Shandong Provincial Natural Science Foundation of China (No. ZR2022MH052 to XY, No. ZR2020MH012 to JW)."

"Trial registration Chinese Clinical Trial Registry ChiCTR2200060112 on 19 May 2022."