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

Okanagan-Shuswap weather: weekend rain

Environment Canada forecasts continuing bad weather for the start of the weekend

New homes in Penticton for women and children leaving violence

The B.C. municipal affairs minister scheduled to be in Penticton Friday for new homes announcement

Spirits of missing and murdered felt along the Highway of Tears

A Penticton man is feeling the spirits of the missing and murdered women along the Highway of Tears

Eastside Road re-opened following repairs

Section of Eastside Road closed by the Ministry of Transportation is open after repairs.

Update: Administrative error results in do-over for South Okanagan dangerous offender’s trial

Ronald Arthur Teneycke will return to Penticton court on June 5 to start the process over

600 new campsites coming to provincial parks and recreation sites across B.C.

Tourism Minister announced half of the new spots to 13 most popular provincial parks

Rockslide closes one southbound lane 2km north of Summerland

DriveBC reported the slide just after 6:30 a.m.

Spring rain needed as B.C. sees one of the lowest snowpack levels in 40 years

Snowpack levels in B.C. recorded on May 15 were similar to those in 2015 and 2016

Lake Country Council passes motion to have more regulations on vaping

With vaping on the rise and its health risks uncertain, Gambell wants provisions in place

Cars parked at Voyager RV get stuck underneath fallen rock

One car owner, was on his way to a funeral

RV trailer fire suppressed in West Kelowna late Thursday night

West Kelowna Fire Rescue aided BC Wildfire Services near Bear Creek Park

Court to rule on B.C.’s pipeline permit law in crucial case for Trans Mountain

A panel of B.C. Court of Appeal judges has been mulling B.C.’s constitutional reference cas

Theresa May to quit as party leader June 7, sparking race for new PM

The new Conservative leader will become prime minister without the need for a general election

Kelowna golf course supports MS research

Shadow Ridge Golf Club hosts golf by donation May 27

Most Read