Electroanatomic Mapping of the Atrioventricular Node and Right Inferior Nodal Extension: Insights from a Case Series.

Three patients, two women and one man, aged 50.0 ± 9.8 years, who underwent catheter ablation for typical atrioventricular nodal re-entrant tachycardia, were studied during sinus rhythm. An electroanatomic system suitable for high-resolution mapping and recording of both bipolar and unipolar electrograms was used. Recording of potentials from the area of the right inferior extension was feasible in all patients with bipolar signals. Using unipolar signals, the electrical activity of the atrioventricular node was recorded in all patients. This preliminary report supports the existing evidence that the activity of the atrioventricular node and its right inferior extension can be successfully mapped in the electrophysiology lab.