This book offers updated explanations for the electrophysiological basis of many arrhythmias, with an emphasis on atrial fibrillation. Distinguished experts address specific topics in their fields, gathering current, relevant information in a clear and user-friendly format. It reviews different aspects of bradyarrhythmias and discusses various pacing approaches to terminating tachyarrhythmias. It examines cardiac resynchronization therapy for patients with congestive heart failure, and elaborates on the use of the implantable cardioverter-defibrillator which is becoming an increasingly important therapeutic resource.