Efficiency of donepezil in elderly patients undergoing orthopaedic surgery due to underlying post-operative cognitive dysfunction: study protocol for a multicentre randomised controlled trial

Huichen Zhu, Lu Cong, Yi Chen, Shaoyi Chen, Lingke Chen, Zhenling Huang, Jie Zhou, Jie Xiao, Yonglei Huang, Diansan Su, Huichen Zhu, Lu Cong, Yi Chen, Shaoyi Chen, Lingke Chen, Zhenling Huang, Jie Zhou, Jie Xiao, Yonglei Huang, Diansan Su

Abstract

Background: Post-operative cognitive dysfunction (POCD) is an overarching term used to describe cognitive impairment identified in the preoperative or post-operative period. After surgical operations, older patients are particularly vulnerable to memory disturbances and other types of cognitive impairment. However, the pathogenesis of POCD remains unclear with no confirmed preventable or treatable strategy available. Our previous study demonstrated that the concentration of choline acetyl transferase in the cerebral spinal fluid was a predictive factor of POCD and that donepezil, which is an acetylcholinesterase inhibitor used in clinical settings for the treatment of Alzheimer's disease, can prevent learning and memory impairment after anaesthesia/surgery in aged mice. This study aimed to determine the critical role of donepezil in preventing cognitive impairment in elderly patients undergoing orthopaedic surgery.

Methods: A multicentre, double-blind, placebo-controlled, crossover clinical trial will be performed to assess the efficacy of donepezil in elderly patients undergoing orthopaedic surgery. Participants (n = 360) will receive donepezil (5 mg once daily) or placebo from 1 day prior to surgery until 5 days after surgery. Neuropsychological tests will be measured at 1 day before the operation and 1 week, 1 month, 6 months and 1 year after the operation.

Discussion: This research project mainly aimed to study the effects of donepezil in elderly patients undergoing orthopaedic surgery due to underlying POCD and to investigate the underlying physiological and neurobiological mechanisms of these effects. The results may provide important implications for the development of effective interfering strategies, specifically regarding cognitive dysfunction therapy using drugs.

Trial registration: ClinicalTrials.gov NCT04423276 . Registered on 14 June 2020.

Keywords: Donepezil; Post-operative cognitive dysfunction; Randomised controlled trial.

Conflict of interest statement

The authors declare that they have no competing interests.

© 2021. The Author(s).

Figures

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Fig. 1
Schedule of the major study events

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