Figure 2: A 52 cm IS-1 pacing lead is used as back up pacing wire in the right ventricle. This will be used as the atrial lead eventually. Right anterior oblique (RAO) 30° and left anterior oblique (LAO) 30° view of the EIS catheter at the RV septum approximately 1 to 1.5 cm distal to the His bundle location, along the line between the His bundle site and the RV apex.