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Figure 3 3-Dimensional Electroanatomical Maps of the RV in 2 Representative Patients Undergoing Catheter Ablation of RVOT Tachycardia

(Left) Voltage mapping (left anterior oblique [LAO] 60°) showing preserved bipolar electrograms amplitude throughout the right ventricular (RV) free wall and septum in a patient from group A. Red dots indicate the site of successful radiofrequency ablation in the anteroseptal surface of the right ventricular outflow tract (RVOT). (Right) Voltage mapping (right anterior oblique 30°) showing electroanatomical scar regions in the RVOT in a patient from group B. Targeted ventricular tachycardia was no longer inducible only after completion of serial point ablations completely encircling areas of abnormal voltages.