This book is designed to provide a basic understanding of electrophysiology for the non-electrophysiologist by covering the indications and limitations of the EP study in a straightforward, non-technical way. The opening chapters develop the concepts necessary for understanding the EP study and lead to coverage of the use of EP testing for various arrythmias. The final chapter synthesizes all this information into a general approach to cardiac arrythmias with an emphasis on the application of EP testing. This book is intended for cardiac nurses, cardiac technicians, trainee cardiologists.