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Simple sleep trick may ease Post-Surgery apnea

NCT ID NCT02152202

Symptom relief Sponsor: University Health Network, Toronto Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study tested whether sleeping in a semi-upright position (45-degree angle) after surgery could prevent sleep apnea from getting worse. 164 adults with sleep apnea who were having elective inpatient surgery took part. Half slept semi-upright and half slept flat on their backs. The researchers measured breathing problems on the second night after surgery.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
semi-upright sleeping position
What this could lead to
If it works, this could offer a simple, drug-free way to prevent sleep apnea from getting worse after surgery.
What could go wrong
This is a small, early proof-of-concept study. The effect may be small or not apply to all patients. Sleeping position is just one factor among many.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

164 people

The number who actually took part.

Started

Jul 2011

Finished

Dec 2016

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Adult patients (18 years and above), * ASA physical status I to IV, * Undergoing elective inpatient surgery with obstructive sleep apnea (as determined by initial screening using STOP-Bang questionnaire and if at high risk (\>3 points), * Confirmed by an Apnea-hypopnea index (AHI) \>5 using a diagnostic home portable polysomnography) Exclusion Criteria: * Patients previously diagnosed as OSA and on continuous positive airway pressure (CPAP) device; * Known cervical, shoulder, spine abnormalities, and/or chronic pain predisposing to difficulty in maintaining a sitting position; or * Previous intervention for OSA (e.g., uvulopalatopharyngoplasty, bariatric surgery); where sitting position is contraindicated postoperatively such as hip or spine surgery, hemodynamic instability; ambulatory surgery i.e. planned discharge on the same day of surgery.

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Conditions

The condition(s) this trial relates to.

obstructive sleep apnea syndrome

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Obstructive sleep apnea

Contacts and locations

Locations

  • Mount Sinai Hospital, Department of Anesthesia

    Toronto, Ontario, M5G 1X5, Canada

  • Toronto Western Hospital, Department of Aneshtesia

    Toronto, Ontario, M5T2S8, Canada

  • Toronto Western Hospital, Department of Aneshtesia

    Toronto, Ontario, Canada

  • University Health Network, Department of Anesthesia

    Toronto, Ontario, M5T2S8, Canada

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