Patient Positioning and Its Influence on BIS, NOL, and Cerebral Oxygenation in Anesthetized Patients

Not yet recruiting

• Conditions: Monitoring of Depth of Anesthesia

• Registration Number: NCT07013734
• Lead Sponsor: Ciusss de L'Est de l'Île de Montréal

Brief Summary

The goal of this observational study is to find out how changes in body position during surgery might affect brain monitoring results in patients who are under general anesthesia.The main question it aims to answer is:

- Does patient positioning have an impact on Bispectral Index (BIS) and Nociception Level (NOL) index monitoring (which are values of awareness in anesthesized patients).

Participants will undergo their surgery as planned, except for these extra features:

* Extra monitors placed to check brain activity, pain response, and brain oxygen levels.

* Before the surgery, while the patient is asleep, the patient's table will be moved into two different positions for 2 minutes each to see if the values on the monitor change.

Participants will then have to answer a short questionnaire after surgery about their memories before and after the anesthesia.

Detailed Description

Not available

Study Timeline

• Status Verified: 2025-04
• Study First Submitted: 2025-04-30
• Study First Submitted QC: 2025-06-02
• Last Update Submitted: 2025-06-02
• Study First Posted: 2025-06-10
• Last Update Posted: 2025-06-10
• Study Start: 2025-08
• Primary Completion: 2026-03
• Study Completion: 2026-04

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 64

Inclusion Criteria

• Fully consented, adult patients above 18 years old;
• Supine positioning during the surgery;
• Surgery requiring patient positioning with Vacuform mats.

Exclusion Criteria

• Patient with Body Mass Index (BMI) ≥ 35;
• Patients over 80 years old.

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Variation in Bispectral Index (BIS)	Perioperative period

Secondary Outcome Measures

Name	Time	Method
Variation of Nociception Level (NOL) Index	Perioperative period
Variation of the patient's cerebral saturation measured with cerebral oximetry	Perioperative period