Electrophysiological Study
As previously
described2, an
electrophysiological procedure was performed with standard catheter
positions in the coronary sinus, His bundle region and high
anterolateral right atrial wall after informed consent was obtained.
Following a single transseptal puncture by use of the modified
brockenbrough technique and an 8 Fr SL1 transseptal sheath (St. Jude
Medical), systemic anticoagulation was made with intravenous heparin (50
u/kg) was administered, with additional 1000 u boluses every hour after
the first infusion. An ablation catheter was positioned at the left
atrium through a transseptal puncture. Then activation mapping with the
Ensite Precision (St Jude Medical, Inc., Minnesota, USA) cardiac mapping
system was performed at the left atrium.