Apple Watch electrocardiogram and irregular heart rate features are available today

Today, with an update to watchOS, Apple is making its electrocardiogram (EKG) reading feature available to Apple Watch Series 4 owners. It’s also releasing an irregular rate notification feature that will be available on Apple Watches going back to Series 1. Both are a part of watchOS 5.1.2.
When the Apple Watch Series 4 was announced this past September, the most significant new hardware feature besides the larger screen was probably the ability to take an EKG directly on the Watch. And