Initial procedure
In the case of para-hisian and mid-septal accessory pathways (n=8,
21%), 2 patients (25%) had failure in the initial procedure and 6
(75%) had recurrence of accessory pathway conduction. In all, the main
reason for repeated procedure was inadequate lesion formation due of
cryoablation (n=6, 75%) or the use of low power radiofrequency energy
(n=2, 25%).
The mean cryoablation application time was 13.2 minutes; the initial
procedure was successful in eliminating the pathway, but recurrence
occurred within one month.
In the 2 patients that had a radiofrequency ablation, it was abandoned
due to high risk of AV node injury after an application time <
2.5 minutes.