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Fingertip sensor aims to spot hidden sleep apnea in heart rhythm patients

NCT ID NCT04760002

Diagnosis Sponsor: Herlev and Gentofte Hospital Source: ClinicalTrials.gov ↗

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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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Sep 22, 2026 · Last updated Sep 23, 2026 · Updated 1 time

Summary

Researchers are testing whether a small fingertip sensor called NightOwl can detect obstructive sleep apnea in people with atrial fibrillation. The study enrolls adults under 90 who have atrial fibrillation but no known sleep apnea. Participants use the NightOwl sensor at home, and researchers compare its readings with standard sleep monitoring to see how well it works.

What this could mean

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

Active substance
NightOwl, a fingertip sensor and smartphone app that measures blood oxygen, pulse, and sleep patterns
What this could lead to
If it works, the NightOwl could offer a simple, at-home way to screen for sleep apnea in people with atrial fibrillation, helping doctors spot the condition without an overnight sleep study.
What could go wrong
This is a small feasibility study, so the device may not match standard sleep testing closely enough. The results may not apply to people with other heart conditions or to those already diagnosed with sleep apnea.

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

126 people

The number who actually took part.

Started

Jan 2021

Finished

Jan 2023

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 diagnosed with AF referred to anticoagulation initiation at a nurse-run ambulatory will be asked to participate. Participants will be recruited from the Thrombosis unit (Tromboseklinikken) at Herlev-Gentofte Hospital. Patient reporting of symptoms for sleep apnea is not included as inclusion or exclusion criteria.

Ages

18 to 90 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: 1. Diagnosis of AF of any type 2. Age \< 90 years 3. Age \>18 years Exclusion Criteria: 1. Known sleep apnea 2. Secondary AF (post-surgical, due to infection, thyroid-induced) 3. Known or newly discovered severe ventricular ectopic beats (as defined by the NightOwl manual) 4. Professional drivers 5. Severe heart failure (New York Heart Association class III or IV) 6. Severe chronic obstructive pulmonary disease (use of home oxygen)

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Conditions

The condition(s) this trial relates to.

atrial fibrillation 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

  • Herlev-Gentofte Hospital

    Copenhagen, Denmark

More trials for these conditions

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