Basic principles.- Ablation of cardiac arrhythmias - energy sources and mechanisms of lesion formation.- Three-dimensional electroanatomic mapping systems.- Accessory pathways.- Atrioventricular nodal reentrant tachycardia.- Cavotricuspid isthmus-dependent atrial flutter - common-type atrial flutter.- Atypical atrial flutter.- Focal atrial tachycardia.- Ventricular tachycardia.- Catheter ablation of atrial fibrillation.- Mapping and ablation in the pediatric population.- Mapping and ablation in congenital heart disease.