Atrial fibrillation (AFib), an abnormal heart rhythm with symptoms often described as "butterflies" in the chest, is the most common type of heart arrhythmia, affecting an estimated 2.7-6.1 million people in the United States, according to the CDC.
Atrial fibrillation (AFib), an abnormal heart rhythm with symptoms often described as "butterflies" in the chest, is the most common type of heart arrhythmia, affecting an estimated 2.7-6.1 million people in the United States, according to the CDC.