When Apple released its latest Apple Watch Series 4 watch on September 12, one of the most exciting features was the ability to take electrocardiogram readings on the wrist.
At that time, the functionality had just been approved by the US FDA, so the software needed a little more time before it was available. The company said it would come this year, but no date was given.
Today this feature has just started to work, but is currently limited to the Apple Watch Series 4 that have been purchased and are being used in the US. In other places it will only be added when the appropriate health agencies in each place approve it. That is why, outside of the United States, we do not even see the new ECG application on the clock.
This functionality has enormous potential. It allows you to get an ECG in a matter of seconds. To use it, you must support the arm with the clock on a surface such as a table or legs and place the index finger of the other hand on the digital crown for 30 seconds. Because there are electrodes on the back of the watch, the user closes the circuit and the electrical signals are measured through the heart.
The new watchOS update, version 5.1.2, also includes another feature, Irregular Rhythm Notification, which analyzes pulse rate data to identify episodes of irregular heart rhythms and provides a notification to the user.
The watch occasionally checks the heartbeat of the user in the background and if it detects an irregular rhythm in five rhythm checks made in just over an hour (65 minutes), it will let you know.