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.