Breath test could reveal hidden blood flow in lungs
NCT ID NCT01402752
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study tests whether a simple breathing test can reliably measure blood flow in the lining of the windpipe and large airways. Healthy adults breathe a harmless gas called dimethyl ether, and the amount they breathe out reveals how much blood is flowing through the airway tissues. The goal is to see if the measurement gives the same result when repeated five minutes apart. If the method proves reproducible, it could offer a non-invasive way to monitor airway health in conditions like asthma or chronic bronchitis.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- dimethyl ether tracer gas
- What this could lead to
- If validated, this non-invasive technique could help doctors monitor airway blood flow in lung diseases without needing a bronchoscope.
- What could go wrong
- This is a small, early-stage validation study in healthy people only. The method may not work reliably in patients with lung disease or be practical in routine care.
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.
- Start date
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Nov 2013
- Expected to finish
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Mar 2014
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
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18 years and older
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide 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: * The patient must have given his/her informed and signed consent * The patient must be insured or beneficiary of a health insurance plan Exclusion Criteria: * The patient is under judicial protection, under tutorship or curatorship * The patient refuses to sign the consent * It is impossible to correctly inform the patient * Patient is pregnant * Patient is breast feeding * The patient is a smoker * The patient has, or has a history of, chronic respiratory insufficiency * The patient has a contra-indication for a treatment necessary in this study
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As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
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