Also called an irregular heartbeat, an arrhythmia is a problem with the rate or rhythm of the heart. It could be beating too quickly, too slowly or with an irregular pattern. Atrial fibrillation is the most common form of arrhythmia and causes an irregular and fast heart beat.

People with an arrhythmia may experience many symptoms including dizziness, chest pain, shortness of breath and sweating. Arrhythmias are diagnosed using a range of tests including Holter and event monitors, electrocardiogram, stress testing and electrophysiology studies.

Patients with an arrhythmia may need a pacemaker or implantable cardioverter defibrillator (ICD). Other treatments include catheter ablation and surgery.