Figure legends
Figure1. Panel A shows a circular mapping catheter placed at the SVC. The white line indicates the right pulmonary artery, while the isolation line is set at its lower border. Panel B shows the 3D anatomical maps of the SVC seen from the superior and the right anterior oblique views. The red tags indicate the sites at which the phrenic nerve are captured following the application of 5 V pacing pulses. Initial RF applications were delivered circumferentially at the blue tag locations.(yellow arrow).
Figure 2. Representative case of the contrast-enhanced CT scan is shown in the panel A. The red area is the cross-section of the SVC. This area is measured by tracing its boundary with a commercial software program at the level of the lower border of the RPA. Each dot shown in panel B indicates the SVC area at baseline and four months after the ablation. The mean SVC area significantly decreased from 2.50 ± 0.94 cm2 to 2.19 ± 0.82 cm2 (p = 0.016).
Figure 3. Mean applications time of trivial, mild, and moderate stenosis groups are 203 ± 53, 210 ± 52, and 216 ± 144 s, respectively. There are no significant differences among the three groups.
Figure 4. Initial SVC area of mild and moderate stenosis groups is 2.70 ±0.75 cm2. This value reduces to 1.56 ± 0.42 cm2 at four months after the ablation, but recovers slightly to 1.80 ± 0.57 cm2 at the second followup.