Arrhythmia is loss of cardiac rhythm, especially irregularity of heartbeat.

Supraventricular Arrhythmias

Common Supraventricular Tachycardia requiring drug treatment are atrial fibrillation (AF), atrial flutter, and paroxysmal supraventricular tachycardia (PSVT). Other arrhythmias that usually do not require drug therapy are not discussed here (e.g., premature atrial complexes, sinus arrhythmia, and sinus tachycardia).