Anatomic tagging of the esophagus revealed contact with the posterior left atrium in 100% of patients, requiring adjustment of left and right PV encircling lines in 47% and 10% of patients.
Observational (n=30)
Does anatomic tagging of the esophagus using an electromagnetic mapping system reveal topographic variability that influences the adjustment of ablation lines in patients with atrial fibrillation undergoing catheter ablation?
Anatomic tagging of the esophagus during AF ablation reveals highly variable esophageal topography, necessitating individual adjustment of ablation lines in most patients to prevent esophageal injury.
UNLABELLED: Topography of the esophagus in atrial fibrillation ablation. INTRODUCTION: The close anatomic relationship of the posterior wall of the left atrium (LA) and the thermosensitive esophagus creates a potential hazard in catheter ablation procedures. METHODS AND RESULTS: In 30 patients (pts) with atrial fibrillation (AF) undergoing catheter ablation, we prospectively studied the course and contact of the esophagus in relation to LA and the topographic proximity to ablation lines encircling the right-sided and left-sided pulmonary veins (PV) as well as to the posterior line connecting the encircling lines using the electromagnetic mapping system for reconstruction of LA and for tagging of the esophagus. This new technique of anatomic tagging of the esophagus was validated against the CT scan as a standard imaging procedure. The esophageal course was highly variable, extending from courses in direct vicinity to the left- or right-sided PV as well as in the midportion of the posterior LA. In order to avoid energy application in direct proximity to the esophagus, adjustments of the left and right PV encircling lines were necessary in 14/30 pts (47%) and 3/30 (10%). In 30 pts (100%), the mid- to inferior areas of the posterior LA revealed contact with the esophagus. Therefore, posterior and inferior linear ablation lines were abandoned and shifted to superior in 29 pts (97%). CONCLUSIONS: Anatomic tagging of esophagus revealed a highly variable proximity to different areas of the posterior LA suggesting individual adjustment of encircling and linear ablation lines in AF ablation procedures to avoid the life threatening complication of esophagus perforation.
Kottkamp et al. (Tue,) conducted a observational in atrial fibrillation (n=30). Anatomic tagging of the esophagus using electromagnetic mapping system was evaluated on Course and contact of the esophagus in relation to left atrium and topographic proximity to ablation lines. Anatomic tagging of the esophagus revealed contact with the posterior left atrium in 100% of patients, requiring adjustment of left and right PV encircling lines in 47% and 10% of patients.