[The place of the electrophysiology examination and radiofrequent ablation in cardiac arrhythmias].
Intracardial electrophysiology testing is in use to estimate mechanism of heart rate dysfunction, and is the most useful procedure in treatment of arrhythmias and dysfunction in impulse conduction. QRS complex is main electrocardiographically characteristic for supraventricular and ventricular tachycardia, because of that tachycardia can be with narrow QRS complex or with wide QRS complex. Tachycardia with narrow QRS complex is one where the QRS complex last <120 millisecond. Atrioventricular node reentry tachycardia in reentry flow involves atrioventriculare node and surrounding atrial tissue. Wide QRS tachycardia (120 millisecond) can be supraventricular arrhythmias with continuous or frequent dependent aberrant intraventricular conduction and supraventricular arrhythmias with anterograde preexcitacion and ventricular arrhythmia.Safety and cost effectiveness of radiofrekvent ablation, made ablation method of choise in most patients with supraventricular rhythm disorders.