![]() Failure occurred in 5 patients (including the 3 patients with multiple atrial foci). Successful ablation was obtained in 31 (86%) of 36 patients, with a median of two radiofrequency applications (range 1 to 32) at 10 to 50 W for 10 to 60 seconds. Three patients showed multiple foci during the procedure. Tachycardia rose from the right atrium in 33 of 36 patients and from the left atrium in the remaining three. Pace-mapping during sinus rhythm and entrainment techniques were occasionally used for mapping. When two ablation catheters were used, an encircling approach was taken. One or two ablation catheters with a 4 mm distal electrode were used to find (1) the earliest local atrial activation time compared to P-wave onset in the bipolar recording mode and (2) a QS pattern in the unipolar mode. The suspected mechanism of the clinical arrhythmia was automatic in 16 patients, intraatrial reentrant in 15, sinoatrial reentrant in 3, and unknown in 2. Thirty-six patients underwent electrophysiologic study and radiofrequency ablation of atrial tachycardias, excluding atrial flutter. We reviewed the initial success rate and long-term follow-up of radiofrequency ablation of atrial tachycardias. Experience with catheter ablation directed at the atrial origin of the tachycardia remains limited. ![]() His bundle ablation has been proposed as a palliative treatment to treat symptoms and prevent development of tachycardia-mediated cardiomyopathy. ![]() Atrial tachycardias are frequently unresponsive to medical therapy. ![]()
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