Smartwatch and ring take on the 12-Lead ECG in heart rhythm showdown

NCT ID NCT05298553

Completed Diagnosis Sponsor: Oxford University Hospitals NHS Trust Source: ClinicalTrials.gov ↗

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study tested whether two wearable devices—the Apple Watch and the Skylab CART-I ring—can accurately detect atrial fibrillation and other irregular heart rhythms compared to the standard 12-lead ECG. Researchers recruited 500 adults from UK cardiology clinics. Each participant wore both devices and had their heart rhythm recorded simultaneously with the standard test. The goal was to see if the wearables' single-lead ECGs and automatic detection algorithms could match the gold standard. If successful, these devices could make it easier to spot hidden heart rhythm problems without a clinic visit.

What this could mean

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

Active substance: Apple Watch and Skylab CART-I ring (wearable single-lead ECG devices)
What this could lead to: If these wearables prove accurate, they could help catch hidden heart rhythm problems earlier, potentially preventing strokes.
What could go wrong: This is a completed diagnostic study, not a treatment trial. The devices may not be as reliable as the gold-standard 12-lead ECG, and results may not apply to all patients.

This is an AI summary of the original study and may miss details. Read our disclaimer.

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Conditions

The condition(s) this trial relates to.

Arrhythmias, Cardiac atrial fibrillation ventricular arrhythmias due to cardiac ryanodine receptor calcium release deficiency syndrome

As listed by the trial registrant

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

ATRIAL FIBRILLATION CARDIAC ARRHYTHMIA

Contacts and locations

Locations

Oxford Univeristy Hospitals NHS Foundation Trust

Oxford, Oxfordshire, OX89DU, United Kingdom
University Hospital Birmingham

Birmingham, United Kingdom
University Hospital Southampton

Southampton, United Kingdom

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