NCT05908318

Effect of Preoperative Olfactory Training on Postoperative Delirium in the Elderly Undergoing Orthopedic Surgeries

Preoperative Olfactory Training Reduces the Incidence of Postoperative Delirium in Elderly Patients Undergoingorthopedic Surgeries: a Prospective Randomized Controlled Clinical Study

• Status: Unknown
• Phase: N/A
• Study type: Interventional
• Enrollment: 450 (estimated)
• Sponsor: Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University · Academic / Other
• Sex: All
• Age: 60 Years – 90 Years
• Healthy volunteers: Not accepted

Summary

To observe whether preoperative olfactory training can reduces the incidence of postoperative delirium in elderly patients undergoing orthopedic surgeries, a prospective randomized controlled study method will be used in this study.

Detailed description

450 elderly patients undergoing orthopedic surgeries (hip or knee replacement and laminectomy) under general anesthesia or combined spinal epidural anesthesia will be selected. They will be randomly divided into control group and olfactory training group.The olfactory training group was performed 24-48h before surgery used phenylethyl alcohol (rose), phytol (press tree), citronella (lemon), eugenol (clove) 4 kinds of smell，twice a day for three days. The general condition, operation, anesthesia and hospitalization related data of the patients will be recorded. Outcome Measures： Incidence of postoperative delirium: The 3D-CAM scores of the control group and the olfactory training group were evaluated within 1-5 days after operation. Degree of delirium：The MDAS of the control group and the olfactory training group were evaluated within 1-5 days after operation. Pain：The VAS of the control group and the olfactory training group were evaluated within 1-5 days after operation. Olfactory function：The TDI scores of the control group and the olfactory training group were evaluated in 3 days before operation and 48h after operation. Cognitive function：The MoCA scores of the control group and the olfactory training group were evaluated in postoperative 5-7 days. Markers: Delirium related markers and inflammatory factors in bloods was detected before surgery and after anesthesia. Delirium related markers and inflammatory factors in cerebrospinal fluid was detected after spinal puncture. Subgroup analysis: patients were divided into delirium group and non-delirium group according to whether delirium occurred, and the data of the two groups were compared, including preoperative and postoperative olfactory function TDI scores, preoperative and postoperative VAS scores, nutritional scores, activity scores, and frailty index, Carlson comorbidity index, depression, anxiety state, sleep disturbance, etc., to screen risk factors.

Conditions

• Preoperative Olfactory Training
• Postoperative Delirium

Interventions

Type	Name	Description
BEHAVIORAL	olfactory training	In this group, patients were performed 24-48h before surgery used phenylethyl alcohol (rose), phytol (press tree), citronella (lemon), eugenol (clove) 4 kinds of smell，twice a day for three days.

Timeline

• Start date: 2023-07-01
• Primary completion: 2025-07-01
• Completion: 2026-01-01
• First posted: 2023-06-18
• Last updated: 2023-06-18