Figure 1: Fluoroscopic and 3-D images of catheter position at start of AVNRT ablation in RAO and LAO projections.

RAO = Right Anterior Oblique, LAO = Left Anterior Oblique, RAA = Right Atrial Appendage, ABL = Ablation catheter, CS = Coronary sinus catheter, HIS = His catheter, SVC = Superior Vena Cava and IVC = Inferior Vena Cava. Images A & B: relative catheter orientation and position in the RAO 30-degree projection on fluoroscopy and 3-D mapping. C&D: relative catheter orientation and position in the LAO 30-degree projection respectively. C: relative catheter orientation and position on fluoroscopy and 3-D mapping respectively.

Figure 2: