There is a great need for a simple book that teaches electrocardiography from a pathophysiologic basis. The proposed paperback book will be small format, concise, and 200-pages in length. It can be utilized as a reference - chapter by chapter or read throughout for an overview. Each chapter will feature ten questions that will provide a chapter review. Ten case studies will be highlighted at the end of the book that will integrate the multiple principles of electrocardiography.