This text provides in-depth introduction to the analysis of the 12-lead electrocardiogram. It offers comprehensive review of cardiac anatomy and relates pathology to the ECG findings. Pathology of cardiac conduction as seen in 3-lead and 12-lead monitoring systems are presented in a practical manner to build confidence in this valuable diagnostic tool. There are self-assessment exercise for each chapter and an overall review section. An instructor supplement will accompany the text. The text reflects the U.S. DOT Paramedic and Intermediate Curricula.