How does the Apple Smart Watch help detect a stroke early?
By checking for irregular heart rhythms and doing an electrocardiogram (ECG/EKG). Every two hours, the irregular heart rhythm warning feature examines heart rhythms in the background and delivers an alert if an irregular heart beat is identified. If an abnormal heart rhythm is detected, the Apple Watch will perform five further tests in rapid succession to see if the result is still positive. Those wearing an Apple Watch Series 4, 5, or 6 will be requested to take an ECG reading if the result is positive. Users of the Apple Watch Series 1 – 3 and the Watch SE are advised to contact their physician or family doctor.
What is atrial fibrillation, and how does it affect you?
A heart rhythm that is erratic and often rapid, resulting in inadequate blood supply.
In atrial fibrillation (or Afib/AF), the top chambers of the heart (atria) do not beat in synchrony with the lower chambers (ventricles), increasing the risk of stroke and heart failure.
Heart are uncertain if monitoring you heart beat at home is helpful
According to the American Heart Association and the American Stroke Association, screening for AFib in the primary-care context among persons over 65 years of age using pulse assessment followed by ECG, if necessary, can be beneficial.
Apple watch disclaimer
The ECG app’s principal disclaimer is that it should only be used by those who are 22 years old or older. However, it also notes that heart rates of less than 50 or more than 120 beats per minute may interfere with the app’s capacity to detect AFib, resulting in inconsistent results.
Other options exist apart from apple watch
According to a 2018 study published in the Journal of Arrhythmia, portable and home-based ECGs are becoming more common and have the potential to transform medical care. However, as the authors of the study point out, there is currently a lack of data to back up their accuracy and ease of use.
If you think you’d benefit from an at-home ECG monitor, speak to your doctor about if it’s the correct strategy for you and which equipment they’d suggest.
Further Reading
How to take an ECG with apple watch


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