The volume provides a well-founded introduction to the essential knowledge for the diagnosis, therapy, and prognostic assessment of cardiac arrhythmias. It is entirely tailored to the needs of daily practice. The necessary anatomical and electrophysiological fundamentals for understanding are summarized in introductory chapters. The well-known electrocardiographic facts are presented in a structured, actionable format. All relevant modern diagnostic and therapeutic procedures based on rhythmological research from the last 30 years are conveyed in a comprehensive and understandable manner. The focus of the book is on practical approaches for individual indications in both adults and children and adolescents.