Effects of intravenous propofol combined with opioids on euphoria in patients undergoing painless gastrointestinal endoscopy: protocol for a randomized double-blind placebo-controlled trial

This study was approved by the Ethics Committee of Xiangcheng People's Hospital of Suzhou (2024-KY-05) on 19 August 2024, and is registered with the Chinese Clinical Trial Registry (ChiCTR2500096595). All participants will provide written informed consent, and the study will adhere to the principles of the Declaration of Helsinki. The findings will be published in a peer-reviewed journal. URL: https://www.chictr.org.cn/showproj.html?proj=252367.