Fig. 8. Left Superior pulmonary vein mapping to identify the pulmonary vein ostium during sinus rhythm. Top picture is a left superior pulmonary venogram.

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Fig. 8. Left Superior pulmonary vein mapping to identify the pulmonary vein ostium during sinus rhythm. Top picture is a left superior pulmonary venogram. Mid-row shows the location of the catheter ablation from the distal pulmonary vein to the anatomical ostium. Bottom row shows changes of the ablation electrograms according to the location. The signals from distal to mid pulmonary vein (arrows) show small single potential and later activation than the atrial activation. The signal from the electrical ostium shows high voltage multicomponent potentials with similar timing of the atrial activation. The signal of anatomical ostium has higher voltage with single component like a local atrial signal. PV: pulmonary vein, OS: ostium, Abl: ablation, HRA: high right atrium, d: distal, p: proximal. Fig. 8. Left Superior pulmonary vein mapping to identify the pulmonary vein ostium during sinus rhythm. Top picture is a left superior pulmonary venogram. Mid-row shows the location of the catheter ablation from the distal pulmonary vein to the anatomical ostium. Bottom row shows changes of the ablation electrograms according to the location. The signals from distal to . . . Korean Circ J. 2014 Sep;44(5):291-300. http://dx.doi.org/10.4070/kcj.2014.44.5.291