Clinical trial Recruiting at 1 site Interventional Ages 18 and up

Head-elevated mask ventilation in severely obese patients

Official title: Effectiveness of Two Different Body Positions During Facemask Ventilation in Class 3 Obesity Patients: a Randomized Crossover Trial

Run by Mount Sinai Hospital, Canada · NCT06305273 · Data updated 2026-11-12

In adults with BMI of 40 or more undergoing surgery, this study tests whether a head-elevated position improves oxygen delivery when using a face mask during anesthesia compared with lying flat.

Quick facts

Study typeInterventional
Ages18 Years and up
SexAll
Enrollment50 (estimated)
SponsorMount Sinai Hospital, Canada
Academic / other
Locations1 site (Toronto, Ontario)
StatusRecruiting
StartedMarch 25, 2024
Main results expectedDecember 1, 2026
Study endsDecember 1, 2026
Registry record updatedJune 17, 2026
Trial IDNCT06305273 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Adults (18+) with BMI ≥ 40 kg/m² scheduled for elective surgery under general anesthesia.

Probably not a fit

Patients with BMI ≥ 40 kg/m² who do not respond to positional changes or have contraindications to alternative positions may not experience benefit.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This interventional study compares two body positions during facemask ventilation after induction of general anesthesia in adults with class III obesity. Participants will be randomized to be ventilated in a supine position or in a head-elevated position, then switched to the other position to compare ventilation parameters in both setups. The primary goal is to see if head elevation improves lung ventilation measurements and oxygenation in severely obese patients. The trial is conducted at Mount Sinai Hospital in Toronto and does not involve a drug intervention. Outcomes focus on airway performance and safety during mask ventilation.

Why it matters

Potential benefit: If successful, the head-elevated position could provide a simple maneuver to improve ventilation in severely obese patients during anesthesia.

How similar studies have gone: Previous research suggests head-elevated positioning can improve mask ventilation in obese patients, but data in BMI ≥ 40 kg/m² is limited.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* BMI \> 40 kg/m2
* age \> 18 years
* scheduled for elective surgery under general anesthesia
* have the ability to comprehend the rationale for the study and provide consent

Exclusion Criteria:

* pregnancy,
* risk of aspiration of gastric content
* patients using glucagon-like peptide(GLP)-1 agonists
* emergency cases
* upper airway disease or airway anatomical abnormalities
* presence of major cardiovascular, respiratory, or cerebral vascular disease
* if the provider anesthesiologist indicates an awake technique to secure the airway

Where it's running

  • Mount Sinai Hospital
    Toronto, Ontario, Canada
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.