Table 2. Electrophysiological and electrical parameters Table 2. Electrophysiological and electrical parameters Table 2. Electrophysiological and electrical parameters Table 2. Electrophysiological and electrical parameters Table 2. Electrophysiological and electrical parameters
Parameter Total (n=28) SIG (n=10) non-SIG (n=18) P Value
Threshold in SVC, V at 2ms, mean (SD) Threshold in SVC, V at 2ms, mean (SD) Threshold in SVC, V at 2ms, mean (SD) Threshold in SVC, V at 2ms, mean (SD) Threshold in SVC, V at 2ms, mean (SD)
Anterior 1.7 (0.6) 1.7 (0.6) 1.7 (0.6) 0.94
Septal 1.6 (0.8) 1.7 (0.9) 1.5 (0.8) 0.68
Posterior 1.4 (0.6) 1.4 (0.4) 1.5 (0.7) 0.85
Average 1.6 (0.5) 1.6 (0.5) 1.6 (0.5) 0.61
SVC-ERP, ms, mean (SD) SVC-ERP, ms, mean (SD) SVC-ERP, ms, mean (SD) SVC-ERP, ms, mean (SD) SVC-ERP, ms, mean (SD)
Anterior 280.0 (49.0) 244.0 (28.0) 300.0 (47.0) 0.003
Septal 269.2 (46.0) 230.0 (27.1) 291.1 (39.5) <0.001
Posterior 272.1 (45.0) 234.0 (35.3) 293.3 (35.0) 0.001
Average 273.8 (43.4) 236.0 (25.2) 294.8 (36.8) <0.001
Dispersion 32.1 (22.0) 30.0 (25.4) 33.3 (20.1) 0.56
SVC sleeve, mm, mean (SD) SVC sleeve, mm, mean (SD) SVC sleeve, mm, mean (SD) SVC sleeve, mm, mean (SD) SVC sleeve, mm, mean (SD)
Length of SVC 28.5 (10.4) 29.6 (9.0) 27.8 (11.2) 0.70
Longer diameter of SVC 24.5 (4.9) 27.4 (4.3) 22.9 (4.6) 0.03
Shorter diameter of SVC 16.1 (3.3) 16.9 (3.3) 15.6 (3.3) 0.30
The SVC-ERP was significantly shorter and longer SVC diameters were significantly longer in the SIG than in the non-SIG. Other parameters were not significantly different between the two group. Abbreviations: ERP, effective refractory period; non-SIG, non-SVC-induced group; SD, standard deviation; SIG, SVC-induced group; SVC, superior vena cava. The SVC-ERP was significantly shorter and longer SVC diameters were significantly longer in the SIG than in the non-SIG. Other parameters were not significantly different between the two group. Abbreviations: ERP, effective refractory period; non-SIG, non-SVC-induced group; SD, standard deviation; SIG, SVC-induced group; SVC, superior vena cava. The SVC-ERP was significantly shorter and longer SVC diameters were significantly longer in the SIG than in the non-SIG. Other parameters were not significantly different between the two group. Abbreviations: ERP, effective refractory period; non-SIG, non-SVC-induced group; SD, standard deviation; SIG, SVC-induced group; SVC, superior vena cava. The SVC-ERP was significantly shorter and longer SVC diameters were significantly longer in the SIG than in the non-SIG. Other parameters were not significantly different between the two group. Abbreviations: ERP, effective refractory period; non-SIG, non-SVC-induced group; SD, standard deviation; SIG, SVC-induced group; SVC, superior vena cava. The SVC-ERP was significantly shorter and longer SVC diameters were significantly longer in the SIG than in the non-SIG. Other parameters were not significantly different between the two group. Abbreviations: ERP, effective refractory period; non-SIG, non-SVC-induced group; SD, standard deviation; SIG, SVC-induced group; SVC, superior vena cava.