AUTHOR=Xue Li-Chao , Ji Hai-Jie , Fan Sha-Sha , Niu Qing , Zhang Jun-Yan , Fang Ai-Li , Wang Ping-Zhi , Tian Shou-Yuan , Zheng Hua 

TITLE=Effect of transcranial direct current stimulation on postoperative delirium in elderly patients undergoing hip fracture surgery: study protocol for a randomized controlled trial

JOURNAL=Frontiers in Medicine

VOLUME=Volume 12 - 2025

YEAR=2025

URL=https://www.frontiersin.org/journals/medicine/articles/10.3389/fmed.2025.1558376

DOI=10.3389/fmed.2025.1558376

ISSN=2296-858X

ABSTRACT=ObjectiveTo evaluate the efficacy of transcranial direct current stimulation (tDCS) in reducing the incidence of postoperative delirium (POD) in elderly patients undergoing hip fracture surgery.Methods and analysisThis single-center, double-blind, randomized controlled trial will enroll 160 participants aged 65 years and older, scheduled for elective hip surgery under spinal anesthesia. Participants will be randomly assigned to either the active-tDCS group or the sham-tDCS group. The active-tDCS group will receive two sessions: one pre-surgery and one post-surgery, with electrodes positioned over the left dorsolateral prefrontal cortex and the right supraorbital area. Each session includes 15-second ramp-up phase at the start, 20 min simulation with 2 mA current and 15-second ramp-down phase at the end. The sham-tDCS group will receive two sham procedures with no actual current delivered. Functional brain activity will be monitored before and after each session or sham procedure to assess changes in cortical activation and connectivity using functional near-infrared spectroscopy (fNIRS). The primary outcome measure will be the incidence of POD, assessed using the 3-Min Diagnostic Interview for Confusion Assessment Method (3D-CAM). Secondary outcomes include the severity of delirium, postoperative pain, anxiety, depression, cognitive function, and sleep quality.Trial registrationThe trial was registered at ClinicalTrials.gov (NCT06678529) on Oct 22, 2024.