What cardiologists think about the Apple Watch's heart-tracking feature

Apple Watch 4

New Apple Watch Series 4 steals the show

Apple is slowly evolving its smartwatch into a medical device.

The health features don't stop there and the Smart Watch Series 4 includes an updated accelerometer and gyroscope which can identify when someone takes a fall. In terms of design, it is quite similar to last year's Apple Watch Series 3 except for the near edge-to-edge display and a new placement of its microphone. Of course, the Apple Watch 4 isn't out yet, and it could be that Apple has more tricks up its sleeve that'll make the brand new device a necessary purchase.

Worldwide, about 48 million smartwatches are expected to be sold this year, compared with almost 1.9 billion phones, according to the research firm Gartner. In an ideal situation, someone who doesn't know they have a problem could get a warning from their watch and take that data to their doctor.

A big difference between the Apple Watch 4 and its predecessor is size; as well as both sizes of the watch being 2mm bigger than previous watches, at 40mm and 44mm as opposed to 38mm and 42mm, new edge-to-edge technology means the screen size is just over 30% larger.

The older models of Apple watch came with heart rate sensors and tracked calories burned, resting heart rate, the Apple Watch Series 4 has few new features. In February, the company announced that the watch would track skiing and snowboarding runs, including data on speed and vertical descent.

Just after midnight Friday, Apple started taking preorders for two of its new iPhones and Series 4 smartwatch and, according to some users, models for delivery by launch day on September 21 are already sold out. The Watch 4 uses an electrode mounted to the backside of the watch that detects heart rate among other metrics.

Next, Apple's senior vice president of worldwide marketing Phil Schiller announced the stars of the show, the iPhone XS and the iPhone XS Max. "We are going to take iPhone X to the next level", chief executive Tim Cook said.

Apple's watch will use new sensors on the back and on the watch dial.

Apple successfully obtained 2 certifications from Food and Drug Administration (FDA) and has been able to detect a potential heart condition called atrial fibrillation with an accuracy rate of 98 percent. That's the part Gundotra seemed to be disputing, though CNBC reporter Chrissy Farr shared some helpful context via Twitter: Have clarity on this - Alivecor is available to buy over the counter or online, but a doctor reviews the first ECG to "unlock" it within 24 hours.

Fall detection could also be significant, especially for elderly users. The app has been gaining traction as of late and allows Apple smartwatch owners to talk with each other. It can even automatically call 911 if you are inactive up to a minute after the initial tumble. The iPhone Xs, Xs Max, and Watch Series 4 all land in consumer hands September 21.

Apple says it monitored some 2,500 people - measuring how they fell off ladders, missed a step while walking or got their legs caught in their trousers while getting dressed.

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