This book describes the main cardiac arrhythmias, with particular emphasis on the problems commonly encountered in their interpretation, and discusses the practical aspects of current methods of investigation and treatment. Information of purely academic value has not been included. The book is intended to fill the gap between those textbooks that cover only the basics of arrhythmias and those that are written for the cardiac electrophysiologist. It has been written with junior hospital doctors in mind. They receive little formal training in the mangement of cardiac arrhythmias and yet, because prompt action is often required, the onus of diagnosis and treatment usually falls on them. It should also be of interest to medical students who will soon be responsible for dealing with arrhythmias, to nurses working in coronary and intensive care units and to physicians who want a brief review of the practical aspects of cardiac arrhythmias.