Figure 11e

Postoperative tachycardia with focal mechanism.
(A) Electrograms recorded from a number of endocardial sites before successful focal ablation can be seen. This arrhymthmia was rapid (CL200ms and regular at the site of successful ablation (right superior pulmonary vein) in contrast to the irregular but well-formed atrial electrograms at other sites. This was consistent with second- degree conduction block between the focus and more distant atrial sites.
(B) termination of the tachycardia 3s after the onset of the onset of the successful radiofrequency application.
(C) and (D) X-ray images showing the position of the successful radiofrequency energy application (arrows).

Thomas,S.P. and others,Mechanism,Localization and Cure of Atrial Arrhythmias Occurring After a New Intraoperative Endocardial Radiofrequency Ablation Procedure for Atrial Fibrillation,JACC VOL.35,No.2,2000,Feb.2000;442-50.