The most common type of arrhythmia—or abnormal heart rhythm—atrial fibrillation (AFib) is a disorder of the heart’s electrical system that affects an estimated 2.3 to 5.6 million people in the US. During AFib episodes the heart’s upper chambers (the atria) beat irregularly and out of sync with the heart’s lower chambers (the ventricles). In some people these episodes come and go. In others they are chronic and occur regularly. In both cases, the arrhythmia itself isn’t generally serious; however, abnormal blood flow and strain to the heart can lead to serious medical conditions.

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