Electrophysiological and electrical parameters
Overall, 28 SVCs were studied at 84 pacing sites. There was no significant difference in the threshold (average threshold was 1.6±0.5 V in the SIG vs. 1.6±0.5 V in the non-SIG, at 2-ms pulse duration, p=0.61), the dispersion of the SVC-ERP (30.0±25.4 ms in the SIG vs. 33.3±20.1 ms in the non-SIG, p=0.56), length of the SVC (29.6±9.0 mm in the SIG vs. 27.8±11.2 mm in the non-SIG, p=0.70), and shorter diameter of the SVC (16.9±3.3 mm in the SIG vs. 15.6±3.3 mm in the non-SIG, p=0.30) between both groups. However, SVC-ERPs were significantly shorter (average SVC-ERP was 236.0±25.2 vs. 294.8±36.8 ms, p<0.001) and longer diameters of the SVC sleeve were significantly longer (27.4±4.3 vs. 22.9±4.6 mm, p=0.03) in the SIG than in the non-SIG (Table 2).