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Could a simple exercise breathing test replace invasive heart probes?

NCT ID NCT04450459

Diagnosis Sponsor: Jena University Hospital 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Aug 06, 2026 · Last updated Aug 07, 2026 · Updated 1 time

Summary

This trial tests whether a non-invasive exercise test that measures oxygen uptake (ergospirometry) can accurately detect heart ischemia in people with stable angina. Currently, the most reliable method is an invasive procedure called FFR, which measures blood flow during cardiac catheterization. The study compares the diagnostic accuracy of the ergospirometer test against FFR to see if it could serve as a better non-invasive alternative.

What this could mean

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

Active substance
ergospirometer test (a non-invasive exercise test that measures oxygen uptake and breathing during physical activity)
What this could lead to
If successful, this could provide a more accurate, non-invasive way to detect heart ischemia, potentially reducing the need for invasive procedures.
What could go wrong
The trial is relatively small and early-stage. The new test may not prove accurate enough to replace current methods, and individual results can vary.

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

121 people

The number who actually took part.

Started

Jan 2019

Finished

Aug 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

patients with suspected CAD presenting for diagnostic testing/ coronary angiography

Ages

18 years and older

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: * stable Angina (CCS \>1-3) with suspected CAD or * dyspnoea at exertion NYHA \>2 or * signs of ischemia within SPECT or exercise electrocardiography * willingness to participate in the trial Exclusion Criteria: * Unstable angina or myocardial infarction within the last 2 weeks * inability to perform bicycle exercise test * significant valvular disease * HOCM * av- block \>I degree * asthma bronchiales

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Conditions

The condition(s) this trial relates to.

Angina, Stable

As listed by the trial registrant

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

Stable angina

Contacts and locations

Locations

  • Universityhospital

    Jena, 07747, Germany

More trials for these conditions

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