PMC10232176_01
(a) Intracardiac electrogram recorded by the mapping catheter. This reveals the long duration of fragmented potentials at the slow conduction isthmus. (b) The activation map of the SVC-RA during AT shows curved vectors surrounding (white line). The focal blue point indicates the AT termination point, and the phrenic nerve sites were identified by pacing (orange points).
CRIC2023-5074946.001.jpg
PMC10232176_01_CRIC2023-5074946.001.jpg
fig1
Electrical activation revealed localized reentry on the SVC, appearing as a double loop circuit or a figure of eight (Supplemental Videos 1 and Figures 1(a) and 1(b)).