A huge study suggests the Apple Watch can detect a worrisome irregular heartbeat at least sometimes B次元官网网址� but experts say more work is needed to tell if using wearable technology to screen for heart problems really helps.

More than 419,000 Apple Watch users signed up for the unusual study, making it the largest ever to explore screening seemingly healthy people for atrial fibrillation, a condition that if untreated eventually can trigger strokes.

Stanford University researchers reported Saturday that the watch didnB次元官网网址檛 panic flocks of people, warning just half a per cent of participants B次元官网网址� about 2,100 B次元官网网址� that they might have a problem.

But even among those flagged, B次元官网网址渋tB次元官网网址檚 not perfect,B次元官网网址� cautioned Dr. Richard Kovacs of the American College of Cardiology, who wasnB次元官网网址檛 involved with the study.

People who received an alert were supposed to consult a study doctor via telemedicine and then wear an EKG patch measuring cardiac activity for the next week to determine the watchB次元官网网址檚 accuracy. Some skipped the virtual check-up to consult their own doctors; overall, about 57 per cent sought medical attention.

Among those who got EKG monitoring through the study, a third had atrial fibrillation, according to preliminary results being presented at an American College of Cardiology conference in New Orleans.

A-fib tends to come and go, and a week of monitoring might have missed some cases, said Stanford lead researcher Dr. Mintu Turakhia. But if the watch detected another irregular heartbeat while someone was wearing the EKG patch, 84 per cent of the time it really was a-fib, he said.

B次元官网网址淭his study we believe provides very encouraging evidence that a device, the Apple Watch, can be used to detect a-fib and to point out to people when additional monitoring or testing may be needed,B次元官网网址� said Dr. Lloyd Minor, StanfordB次元官网网址檚 dean of medicine.

Other cardiac experts said the study, which was funded by Apple, suggests screening with wearable technology might be technically feasible eventually, but needs lots more research.

B次元官网网址淚 would not advise this to the overall general population,B次元官网网址� said Dr. Valentin Fuster, director of Mount Sinai Heart in New York and a former American Heart Association president, who wasnB次元官网网址檛 involved with the study. Instead, heB次元官网网址檇 like to see it tested in seniors with risk factors like high blood pressure.

What is atrial fibrillation?

A-fib occurs when the heartB次元官网网址檚 top chambers, called the atria, get out of sync with the bottom chambersB次元官网网址� pumping action. Sometimes patients feel a flutter or a racing heart but many times theyB次元官网网址檙e not aware of an episode.

Sometimes the heart gets back into rhythm on its own. Other patients get an electric shock to get back into rhythm, or are prescribed blood thinners to counter the stroke-causing blood clots that untreated a-fib can spur. A-fib causes 130,000 deaths and 750,000 hospitalizations a year in the U.S.

How do doctors check for it?

A-fib is most common in older adults, and other risks include high blood pressure or a family history of arrhythmias. But routine screening isnB次元官网网址檛 recommended for people without symptoms. Studies havenB次元官网网址檛 yet proved that early detection from screening would prevent enough strokes to outweigh risks from unnecessary testing or overtreatment.

How does the Apple watch check for it?

A mobile app uses the optical sensor on certain versions of the watch to analyze pulse rate data. If it detects enough variation from beat to beat over a 48-hour period, the user receives a warning of an irregular heart rhythm.

The latest version of the Apple Watch also allows wearers to push a button to take an EKG and share the reading with doctors. SaturdayB次元官网网址檚 study didnB次元官网网址檛 include watches with that capability.

Does the new study show mass screening is a good idea?

No. The study was designed to tell how the watch compared to a week of standard EKG monitoring B次元官网网址� not if the wearerB次元官网网址檚 health improved because the screening uncovered the arrhythmia. To prove if detecting a-fib early lowers risk of stroke would require years of study.

And since the study didnB次元官网网址檛 have a comparison group getting routine EKGs, thereB次元官网网址檚 no way to know if the watch missed heartbeat problems, giving a false sense of security, Kovacs said.

The puzzling low numbers of alarms might be because most participants were young or middle-aged, not the seniors who are most at risk for a-fib, he said.

Lauran Neergaard, The Associated Press

Like us on and follow us on .