In this practical textbook, leading experts provide a cutting-edge overview of interventional therapy for supraventricular and ventricular arrhythmias. The focus is on catheter ablation with radiofrequency current, which is covered in detail from the basics to differential therapy, including ICD implantation and drug therapy. The book discusses pre-ablation and online impedance measurement, the current state of development of mapping procedures, and the latest methods of catheter ablation. It also includes practical ECG examples, X-ray projections, biophysical measurement parameters, mapping data, and many partly color illustrations. The conclusion presents current expert know-how in a didactically clear and practical manner, making it ideal for learning, applying, and quick reference.