This is a concise but straightforward study guide used by hundreds of students for the EKG national certification exam. Included in the book are: -Duties of an Electrocardiograph technician -General anatomy of the heart -Internal heart structure -Coronary Circulation -Heart physiology -Basic electrophysiology -Conduction system of the heart -Fundamentals of electrocardiogram -The electrocardiographic grid waves -Definition of waves, segments, intervals...