ECG function of Apple Watch Series 4 arrives today in watchOS 5.1.2 update

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  Apple has confirmed it will be shipping the update to watchOS 5.1.2 on Thursday complete with support for the Apple Watch Series 4's electrocardiogram (ECG) measuring function, a feature that was notably absent at the device's launch.

Apple Watch Series 4 ECG

Arriving later today, the update will include the ECG app, which will work just on the Apple Watch Series 4, the company advised. While the current watchOS 5.1.1 does not currently support the function, the release of the in-beta watchOS 5.1.2 will bring the feature live to users based in the United States.

Touted as a major feature for Series 4 models, the function marks the first time an ECG device has been made available over the counter to consumers. At the time of launch, Apple advised the function would not be available immediately, but would be enabled in a later software update.

The app is capable of using new electrodes in the back crystal and Digital Crown to take a single-lead reading. To take a reading, users must open the ECG app and hold their finger on the crown for 30 seconds, after which the readings are classified as atrial fibrillation (Afib,) sinus rhythm, or inconclusive.


Recordings and classifications, as well as any noted symptoms, are stored in the Health app on the connected iPhone, which can be shared with physicians at a later time.

Owners of earlier Apple Watch models as far back as the Series 1 will be able to benefit from another addition to watchOS. Using the optical heart sensor, the Irregular Rhythm Notification feature will check a user's heart rhythm in the background for signs of irregularity that may be Afib.

If the Apple Watch detects irregular rhythms on five checks over a minimum of 65 minutes, it will warn the user of the potential health problem, and to gain further advice from a physician.

Left untreated, Afib is said to be one of the leading conditions that can result in a stroke, the second-most common cause of death in the world. According to CDC estimates, Afib can affect up to two percent of the younger population of the United States, rising to nine percent for those 65 years or older.


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