Today, pacemaker, ICD, and CRT technologies have become increasingly sophisticated and broadly applicable in a wide range of patients. As a result, it is increasingly important for the clinician to be familiar with these therapies for optimum patient care. However, it is difficult for the busy clinician to keep up with the fast-changing pace of implantable device therapy despite the availability of several excellent textbooks, often providing an encyclopedic view of cardiac pacing and defibrillation. Consequently, this book has been developed with the objective of providing a relatively easy-to-read text that can serve as a handy reference on the principles and practice of cardiac pacing and defibrillation. Each chapter of this volume is authored by experienced physicians, device engineers, or research scientists who are currently practicing and/or specializing in the topic.This book is especially designed for implanting and follow-up physicians, physicians-in-training, and device engineers.