Note: There was no statistical difference between the radiography group and non-radiography group, and among three locations of Zone 2, superior septum and inferior septum.

Figure 1. Right ventriculography under fluoroscopic RAO30 (A, B and C) and LAO45 (D) in a patient. Nine septal subdivisions are depicted in the RAO30 image (A) following contrast injection that shows the RV septum (B). LAO45 (D) shows the separation (the green line) between RV and LV. The delivery catheter with Micra^TM leadless pacemaker is shown in Panels C and D.