Today Apple launches the ECG app in two other countries. With watchOS 5.3 release, ECG app and irregular heart rate alerts to Canada and Singapore.
The electrocardiogram sensor sensor is included in all Apple Watch Series 4 devices, but is disabled by software in countries where it has not received approval. The good news is Apple Watch Series 4 owners in Canada, and Singapore can now update to watchOS 5.3 to use the ECG app.
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Canada and Singapore join 29 other regions where the ECG app was already available. The ECG was first debuted in the United States last fall along with the Apple Watch Series 4 launch.
The ECG app uses the electrodes of the Digital Crown and the back of the clock to take an ECG reading, which measures the heart's electrical pulses, not just the heart rate.
This allows the watch to diagnose cases of atrial fibrillation. When taking the ECG, the clock will tell the user whether the recorded heart rate pattern shows signs of atrial fibrillation, or if everything works normally (sinus rhythm).
A recording of ECG data is then stored in Health App on the paired iPhone, where it can be exported as PDF and sent to a doctor.
Irregular pulse messages do not require an active ECG to be taken. The clock will analyze heart rate measurements continuously in the background and trigger a warning if something looks.
With the release of watchOS 5.3, the ECG app is now available in Austria, Belgium, Canada, Croatia, Czech Republic, Denmark, Finland, France, Germany, Greece, Guam, Hong Kong, Hungary, Iceland, Ireland, Italy, Luxembourg, The Netherlands, Norway, Poland, Portugal, Puerto Rico, Romania, Singapore, Slovakia, Spain, Sweden, Switzerland, UK, United Kingdom and US Virgin Islands.
To update to watchOS 5.3, open the Watch app on the paired iPhone. Press General -> Software Update and start the download. Apple Watch must be placed on the charger for the update to complete. In addition to the ECG app, watchOS 5.3 also resolves a vulnerability with the Walkie-Talkie app.