A)The longitudinal linear ablation in a cranial direction was performed
with the mapping catheter positioned in the superior vena cava (SVC),
pacing the phrenic nerve (PN) for confirming compound muscle action
potential. B) SVC isolation was performed during the PN pacing with
1200-ms interval. The intracardiac electrogram shows SVC isolation from
the 3rd beat.
Supplement 1 The activation map during sinus rhythm shows the
reconduction between the superior vena cava (SVC) and right atrium (RA)
using Coherent mapTM in CARTO 3 system.