Unlike some pocket guides, which are miniature versions of textbooks a few hundred pages long, this pocket guide, EKG IN A HEARTBEAT, 2/e, has the tools readers need to help them read rhythm strips and 12-lead EKGs. Fast, accurate, and to the point in under 100 pages. EKG IN A HEARTBEAT, 2/e, is not intended as an elementary text on electrocardiography. It's a "how to do it" guide. It presumes at least a basic knowledge of EKG principles. If a comprehensive EKG textbook is required, consider Ellis: EKG Plain and Simple (ISBN: 0132377292).