Asymmetric voltage amplitude of the SVC
A previous report revealed that the length of the SVC muscular sleeve was asymmetric and was longest in the anterior to septal regions (21). Our study revealed that the voltage amplitude of the SVC was also asymmetric and longer in the anterior and septal regions than lateral and posterior areas. The higher voltage amplitude in the anterior area also was related to the higher incidence of touch up ablation in the anterior area.