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.