Understanding Arrhythmia Arrhythmia refers to an irregular heartbeat, encompassing a wide variety of heart rhythm disorders. These can manifest as either a heart rate that is too fast (tachycardia), too slow (bradycardia), or erratic. Among the most common types of arrhythmia are atrial fibrillation and ventricular tachycardia. Atrial fibrillation is [...]