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Not yet recruitingNCT07013734Updated Aug 7, 2026

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

An observational study in Monitoring of Depth of Anesthesia, sponsored by Ciusss de L'Est de l'Île de Montréal. Not yet recruiting. Open to participants aged 18 Years to 80 Years. Per ClinicalTrials.gov, last updated 2026-08-07.

Sponsored by Ciusss de L'Est de l'Île de Montréal · Observational

Study type
Observational
Model
Case-only
Time perspective
Prospective
Enrollment
71
Ages
18 Years to 80 Years
Sex
All
01

Study 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 and after 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.
  • Hard data of the monitors will be extracted and analyzed to evaluate any possible correlation between the position of the patient and brain monitoring results.

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

02

Conditions studied

  • Monitoring of Depth of Anesthesia
03

Who can participate

Ages eligible
18 Years to 80 Years
Sexes eligible
All
Accepts healthy volunteers
No
Sampling method
Probability sample

Study population

Patients from Maisonneuve-Rosemont Hospital undergoing elective surgery.

Inclusion criteria

  • Adult patients above 18 years old able to consent;
  • Supine or lithotomy positioning during the surgery;

Exclusion criteria

Exclusion Criteria:

  • Patient with Body Mass Index (BMI) ≥ 35;
  • Patients over 80 years old.
04

Study design

Observational model
Case-only
Time perspective
Prospective
Enrollment
71 participants (estimated)
Patient registry
No
05

What researchers measure

Primary outcomes

  1. Variation in Bispectral Index (BIS)

    Time frame: Perioperative period

Secondary outcomes

  1. Variation of Nociception Level (NOL) Index

    Time frame: Perioperative period

  2. Variation of the patient's cerebral saturation measured with cerebral oximetry

    Time frame: Perioperative period

06

Study locations

No study locations are listed for this record.

07

Registry details

Key details

Study ID
NCT07013734
Lead sponsor
Ciusss de L'Est de l'Île de Montréal
Responsible party
Sponsor
First posted
Jun 10, 2025
Start date
Aug 2026 (estimated)
Primary completion
Feb 2027 (estimated)
Completion
May 2027 (estimated)
Last update
Aug 7, 2026

Oversight

FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is not yet recruiting, as verified in Aug 2026. You cannot join it, but the record below documents what was studied.

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