AFib could occur intermittently and if the heart rate monitor is not customized for abnormal rhythm detection, the heart rate may be perceived as abnormally high, abnormally low or nil; depending on how it is customized to pick up heart beat. An abnormally high heart rate does not always mean AFib or arrythmia, though AFib is the most common of the arrhythmias. However this would suggest an evaluation by a cardiologist to check for the status of the heart and appropriate management, if required.
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