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

PHOTOS: Powder Blues perform in Mission

Tom Lavin and The Powder Blues packed the Clarke Theatre on Sunday

PHOTOS: Mission dancers shine at annual show

Can Dance Studio celebrated its 30th anniversary with the “United We Dance” end of season showcase

Dash-cam video in trial of accused cop killer shows man with a gun

Footage is shown at trial of Oscar Arfmann, charged with killing Const. John Davidson of Abbotsford

PHOTOS: Dads, car enthusiasts flock to annual show

Mission’s Old Car Sunday in the Park takes place every year on Father’s Day, thousands come out

Parents of Mission murder victim want personal belongings returned

Lisa Dudley’s parents, Rosemarie and Mark Surakka, were at the Mission RCMP detachment Sunday

VIDEO: Trans Mountain expansion project gets green light, again

Prime Minister Justin Trudeau announced the decision in Ottawa on Tuesday afternoon

MPs hear retired B.C. nurse’s petition to change compensation for fatal medical errors

Teri McGrath wants provinces to implement no-fault system for medical errors

Horgan says he’ll still defend B.C. coast after second Trans Mountain approval

Meanwhile, one B.C. First Nation has announced plans for a legal challenge

Metro Vancouver’s air quality could be the worst yet this wildfire season

As wildfire season approached, Metro Vancouver experts predict the air will be an issue for many

Demonstrators on either side of Trans Mountain debate clash in Vancouver

Crowd heard from member of Indigenous-led coalition that hopes to buy 51% of expansion project

Update: Multiple fires along the railway tracks in Pitt Meadows

CP rail has closed tracks while firefighters work

Grieving B.C. mom hopes Facebook message leads to new investigation into son’s Surrey homicide

Criminal Justice Branch didn’t lay charges, concluding no substantial likelihood of murder or manslaughter conviction

B.C.’s measles vaccination program gains traction in May

More than 15,000 doses of the MMR vaccine has been administered across the province

B.C. farmers concerned Agricultural Land Reserve changes choking their livelihood

Dozens voice concerns at special meeting hosted on Vancouver Island

Most Read