health

Apple Watch may spot heart problem but more research needed

More than 419,000 Apple Watch users signed up for the unusual study

A huge study suggests the Apple Watch can detect a worrisome irregular heartbeat at least sometimes — 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 didn’t panic flocks of people, warning just half a per cent of participants — about 2,100 — that they might have a problem.

But even among those flagged, “it’s not perfect,” cautioned Dr. Richard Kovacs of the American College of Cardiology, who wasn’t 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 watch’s 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.

“This 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,” said Dr. Lloyd Minor, Stanford’s 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.

“I would not advise this to the overall general population,” said Dr. Valentin Fuster, director of Mount Sinai Heart in New York and a former American Heart Association president, who wasn’t involved with the study. Instead, he’d like to see it tested in seniors with risk factors like high blood pressure.

What is atrial fibrillation?

A-fib occurs when the heart’s top chambers, called the atria, get out of sync with the bottom chambers’ pumping action. Sometimes patients feel a flutter or a racing heart but many times they’re 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 isn’t recommended for people without symptoms. Studies haven’t 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. Saturday’s study didn’t 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 — not if the wearer’s 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 didn’t have a comparison group getting routine EKGs, there’s 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 Facebook and follow us on Twitter.

Just Posted

Rossland honours its fallen sons and daughters

Cenotaph service marks Remembrance Day

BCTF rejects mediator’s recommendations for settlement

Negotiations between B.C. teachers and the province will continue

RCMP disrupt Castlegar-Trail-Salmo drug flow

Bust on Nov. 6 leads to two arrests

Castlegar woman aiming to get rid of take-out containers

The Bring Your Own to Go Box movement is gaining momentum.

Trail and District Chamber hands out 2019 business awards

Chamber’s event held at the Colombo Lodge on Oct. 19

‘We love you, Alex!’: Trebek gets choked up by ‘Jeopardy!’ contestant’s answer

The emotional moment came in Monday’s episode when Trebek read Dhruv Gaur’s final answer

Birthday boy: Pettersson nets 2 as Canucks beat Predators

Vancouver ends four-game winless skid with 5-3 victory over Nashville

Judge rejects Terrace man’s claim that someone else downloaded child porn on his phone

Marcus John Paquette argued that other people had used his phone, including his ex-wife

Petition for free hospital parking presented to MP Jody Wilson-Raybould

What started as a B.C. campaign became a national issue, organizer said

Petition to ‘bring back Don Cherry’ goes viral after immigrant poppy rant

Cherry was fired from his co-hosting role for the Coach’s Corner segment on Nov. 11.

B.C.’s high gasoline prices still a mystery, Premier John Horgan says

NDP plans legislation this month, seeks action from Justin Trudeau

Group walking on thin ice at B.C. lake sparks warning from RCMP

At least seven people were spotted on Joffre Lakes, although the ice is not thick enough to be walked on

VIDEO: Don Cherry says he was fired, not sorry for ‘Coach’s Corner’ poppy rant

Cherry denies he was singling out visible minorities with his comments

B.C. teacher suspended for incessantly messaging student, writing friendship letter

Female teacher pursued Grade 12 student for friendship even after being rebuked

Most Read