As for the electrocardiogram - the Apple Watch Series 4 uses electrodes in the crown of the watch along with the special LEDs in the crystal underneath the watch to read the electrical impulses in your finger. The Watch will then record your ECG and save it in the Apple Health app.
Apple Watch Series 4 owners are about to gain a potentially life-saving app. Now, nearly three months after the device made its debut, the ECG app is finally available. Also, that it "should not be used to monitor or track disease state or change medication without first talking to a doctor", according to Apple's document as cited by Macrumors.
The Apple Watch Series 4 stood out among previous models and competing smartwatches, thanks to the new ECG features and the new fall-detection feature. Current data shows that anywhere from 2.7 to 6.1 million Americans may suffer atrial fibrillation - a statistic that can be lowered and much more accurately measured with real-time, on-the-go ECG readings. However, Series 1 and up will offer irregular heart rhythm notifications by checking your rhythm in the background and alerting you if signs of AFib are identified. After the test is complete, users can view results, complete with a chart of the heart rhythm, in the Apple Health app.
The ECG feature is created to "capturing heart rhythm in a moment when they experience symptoms like a rapid or skipped heart beat and helping to provide critical data to physicians", which could potentially save a lot of lives. The update will enable ECG functionality on the Apple Watch Series 4 which was heavily publicized by Apple during the unveiling of the wearable.
"Apple Watch has helped so many people around the world, and we are humbled that it has become such an important part of our customers' lives", Jeff Williams, Apple's chief operating officer, said in a statement.
While the original report from The Verge has been pulled, the chances of Apple not releasing watchOS 5.1.2 later today are pretty slim.