Figure legends
Figure 1 . A: Twelve-lead ECG. B: Intracardiac electrogram
during SVT without isoproterenol. The earliest atrial activation site
(EAAS) was CS 7/8 (black arrow). HRA: high right atrium, His:
His-recording site, CS: coronary sinus, RVA: right ventricular apex,
EAAS: earliest atrial activation site.
Figure 2. A, B: Intracardiac electrograms and fluoroscopic views at
unsuccessful site. A: Mitral annulus. Focal activation was 8ms delay
from earliest atrial activation site (EAAS). B: Inside CS. Focal
activation was simultaneous from EAAS. C, D: Intracardiac electrogram at
successful tricuspid annulus site; C: Before ablation. Focal activation
was 24ms delay from EAAS. D: Ablation. Atrial tachycardia terminated
1.9s. E: Activation map and fluoroscopic view at the successful site.
The success site was far from the EAAS. HRA: high right atrium, His:
His-recording site, Nav: ablation catheter electrogram, CS: coronary
sinus, RVA: right ventricular apex, EAAS: earliest atrial activation
site, ABL: ablation catheter, AP: anteroposterior.
Figure 3 . A, B: Post-pacing interval (PPI) at the CS proximal
(CSp) and the earliest atrial activation site (EAAS). A: PPI at CSp was
similar to tachycardia cycle length (TCL), and intra-atrial activation
sequence resembled atrial tachycardia. The last pace was orthodromic
conduction for CS7/8 (red dashed arrow). B: PPI at EAAS. PPI was not
similar to TCL and the last pace was antidromic (blue dashed arrows). C:
Presumed reentrant circuit and preferential conduction. HRA: high right
atrium, His: His-recording site, CS(M): coronary sinus (musculature),
RVA: right ventricular apex, PENT: PentaRay® catheter,
LAO: left anterior oblique, EAAS: earliest atrial activation site,
CSp/d: proximal/distal CS, SCA: slow conduction area, PPI: post-pacing
interval, TA: tricuspid annulus.