Comparison of anesthetic effects of different doses of alfentanil combined with ciprofol in elderly patients undergoing ERCP: a randomized controlled trial.

"Declarations Ethics approval and consent to participateEthics approval was obtained from the Ethics Committee of the Weifang People’s Hospital (KYLL20221128-1) on November 28, 2022.All patients enrolled in this study were evaluated before anesthesia by anesthesiologists above the attending doctor and signed informed consent forms, and the research was performed in accordance with the Declaration of Helsinki. If the patient refused to participate in the study or the surgical method was changed, the study was stopped. Consent for publicationNot Applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding The authors have no sources of funding to declare for this manuscript."

"The study was designed as an assessor-blinded parallel-group randomised controlled trial. This study was approved by the Ethics Committee of the Weifang People’s Hospital (KYLL20221128-1). And the study was registered in Chinese Clinical Trial Registry (02/12/2022; Chinese Clinical Trial registry, No.ChiCTR2200066366). Written informed consent was obtained from all participants. The trial report complies with the Consolidated Standards of Reporting Trials (CONSORT) checklist."