Regional assessment of acute PVR
Acute PVR was defined as spontaneous or isoproterenol-induced PVR, or
adenosine-induced dormant conduction. Each left atrial (LA) antrum was
divided into 6 regions, including supero-/infero-anterior,
supero-/infero-posterior, roof, and bottom, and resulted in 12 segments.
Here, relevant parameters were analyzed, and the minimum values were
identified for each segment such as minimum contact force (CFmin),
minimum force-time integral (FTImin), minimum ablation index (AImin),
maximum inter-lesion distance (ILDmax), and minimum impedance drop
(Imp-min). Changes in three-dimensional-mapping-related indices were
visualized using an on-site monitor. Total impedance decrease measured
at every 100 ms was monitored in graph viewer and later exported for
processing, considering fluctuation related to respiratory cycle (Figure
1).