Heart Arrhythmias
Any kind of abnormal heart rhythm is referred to as an arrhythmia. There are two types of arrhythmias: atrial arrhythmia, also called supraventricular arrhythmia, which begins in the upper chambers of the heart, and ventricular arrhythmia, which begins in the lower chambers of the heart. The most common arrhythmia is atrial fibrillation, or "afib", which affects more than 4 million Americans.