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Could a breath of CO2 stop fainting spells?

NCT ID NCT05295810

Symptom relief Sponsor: University of Calgary Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
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
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This study looks at whether breathing air with a little extra carbon dioxide can help people with neurogenic orthostatic hypotension (NOH) — a condition where blood pressure drops sharply upon standing, causing dizziness and fainting. Researchers will test this in 80 adults (patients and healthy volunteers) at the University of Calgary. The goal is to see if this simple breathing method can raise blood pressure and improve blood flow to the brain.

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

About 80 people

The number the study aims to enrol. It can still change while the study runs.

Started

Mar 2022

Expected to finish

May 2030

An estimate. End dates often move.

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 to 100 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

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: * Age ≥18 years * Male and Female * Non - smokers. * Able and willing to provide informed consent. * Ability to travel to Libin Cardiovascular Institute Autonomic Testing Lab at the University of Calgary, Calgary, AB. Exclusion Criteria: * Medical therapies or medications which could interfere with testing of autonomic function * Participants with somatization or severe anxiety symptoms will be excluded * Pregnant or breast-feeding females * Inability to tolerate mask for the duration of the study * Subjects who require portable oxygen at rest or with exercise * Subjects with chronic heart failure or severe pulmonary disease who are unable to climb one flight of stairs due to shortness of breath. * Presence of failure of other organ systems or systemic illness that can affect autonomic function or the participant's ability to cooperate. These include: dementia, alcohol and/or drug abuse, cerebrovascular disease, kidney or liver disease, surgical procedures where the nerves of the sympathetic nervous system have been cut. * Other factors which in the investigator's opinion would prevent the participant from completing the protocol, including poor compliance during previous studies.

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Conditions

The condition(s) this trial relates to.

Hypotension, Orthostatic orthostatic hypotension primary orthostatic hypotension

As listed by the trial registrant

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

Neurogenic orthostatic hypotension Orthostatic hypotension

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • University of Calgary

    RECRUITING

    Calgary, Alberta, Canada

More trials for these conditions

Other studies related to the condition(s) this trial covers.