This issue of Cardiac Electrophysiology Clinics covers arrhythmias in athletes, which can be a cause of morbidity and mortality. Expert authors review the most current information available about management of ventricular arrhythmias, atrial fibrillation, bradyarrhythmias, syncope and other conditions. Preparticipation screening, defibrillator use, and prevention are also discussed. Keep up-to-the-minute with the latest developments in this important aspect of cardiac electrophysiology practice.