Subclavian venous access for anteroseptal WPW ablation. ( A ) A left anterior oblique fluoroscopic view of the catheters. Ablation catheter (RF) is placed on the anteroseptal pathway [site displayed on ( B )] via subclavian access. Two other catheters are placed via femoral approach in the right atrial appendage (RAA) and in the RV. ( B ) Radiofrequency ablation on ( A ) site. Pathway is eliminated one complex after RF start. Note the right bundle branch block (RBBB) after WPW elimination due to mechanical trauma during RV catheter placement (transient RBBB).