Fig-7; RV ventricular pacing with CL=350 msec showed no atrial activation ( VA dissociation)
Therefore, mapping of mitral annulus was performed again and ablation of broader area of left posterior mitral annulus was done. Radiofrequency (RF) energy via irrigated catheter, delivered to this site for 120 seconds at a temperature of 40˚C and power 30-35 watts, eliminated the bypass tract. after the delivery of the RF energy, there was persistent ventricular-atrial (VA) dissociation. HV interval after ablation was 45 msec.
No more delta wave was seen on ECG.