Fig. 3

Advancement of the radiofrequency Pigtail wire into the left atrium. Transesophageal views: (A) Radiofrequency wire reshaping to its pigtail form inside the left atrium. (B) Catheter sheath crossing through the septum and into the left atrium. (C) Catheter sheath in the left atrium with the dilator and radiofrequency wire withdrawn.