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Breath test could spot dangerous lung clots

NCT ID NCT07241130

Diagnosis Sponsor: Ataturk University 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This study looked at whether measuring carbon dioxide in a person's breath (called end-tidal CO₂) can help doctors quickly identify severe blood clots in the lungs and see if treatment is working. Researchers studied 120 adults, including those with different levels of clot severity and healthy volunteers. The goal was to see if this simple, noninvasive test could replace more complex procedures for guiding emergency 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.

Participants

120 people

The number who actually took part.

Started

Feb 2025

Finished

Jul 2025

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.

Who is studied

This study included adult patients diagnosed with acute pulmonary embolism who were classified as high-risk or intermediate-high-risk based on hemodynamic status, right ventricular dysfunction, and cardiac biomarker elevation. Participants were consecutively enrolled at a tertiary university medical center. The study also included a healthy control group composed of adults without cardiopulmonary disease or significant medical comorbidities. A total of 120 individuals were studied across four cohorts representing different clinical risk categories and routine treatment pathways.

Ages

18 to 80 years

Sex

Anyone

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: Adults aged 18 years or older Diagnosis of acute pulmonary embolism confirmed by CT pulmonary angiography (for PE groups) Classified as high-risk or intermediate-high-risk pulmonary embolism according to ESC/ERS 2019 guidelines Ability to provide informed consent For healthy control group: no history of cardiopulmonary disease, coagulation disorders, or acute medical illness Exclusion Criteria: Known chronic respiratory diseases significantly affecting EtCO₂ measurement (e.g., advanced COPD, severe asthma, chronic respiratory failure) Active infection, sepsis, or acute complications of malignancy Prior thrombolytic therapy for pulmonary embolism Anatomical or technical limitations preventing reliable nasal capnography Pregnancy Individuals younger than 18 years Inability or refusal to provide informed consent

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Conditions

The condition(s) this trial relates to.

pulmonary embolism

As listed by the trial registrant

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

Pulmonary embolism acute

Contacts and locations

Locations

  • Ataturk University

    Erzurum, 25200, Turkey (Türkiye)

More trials for these conditions

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