https://www.vinmec.com/eng/blog/is-atrial-extrasystoles-dangerous-en
Are atrial premature beats (APBs) dangerous? | Vinmec
Atrial premature beats (APBs) are a type of arrhythmia caused by the atria generating abnormal early beats before the normal heartbeat. These premature beats...
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https://www.msdmanuals.com/home/multimedia/quiz/atrial-premature-beats
Quizzes: Atrial Premature Beats-MSD Manual Consumer Version
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