Figure 1.

Fluoroscopic and Electroanatomic Imaging of the Study Protocol

(A) Fluoroscopic image of the invasive protocol. (B) Corresponding electroanatomic endocardial, contact scar map using a decapolar left ventricular (LV) catheter and the EnSite Velocity NavX system (St. Jude Medical, Inc., St. Paul, Minnesota); right anterior oblique (left) and left anterior oblique (right) projections. Data points with a sensed electrogram amplitude of <0.5 mV were defined as scar (grey), those with voltage of >1.5 mV were defined as healthy tissue (purple) and those points in between were in the scar border zone with a color range. The anterior surface of the heart in the left panel has been removed to see the location of the endocardial catheter (green) and distal tip (green circle). The epicardial pacing (LVepi)2 lead is in an anterior vein and displayed in blue on the EAM. In addition, the position of the implanted (LVepi)1 lead is shown on fluoroscopy and has been superimposed on the electroanatomic map in both views. Epi = epicardial pacing; HRA = high right atrial; LVEndo = endocardial pacing; RA = right atrial; RADI = LV pressure wire; RV = right ventricular.