Procedure
Procedures were performed under general anesthesia and were started by a detailed diagnostic electrophysiology study aimed to determine the arrhythmia substrate and evaluate its characteristics. The specificities in terms of technique, catheter choice, source of energy, use of 3D guided technology, and ablation settings differed depending on each individual case, resources availability and expert’s preference. For the cryoablation procedures, the catheter used was Freezor XtraTM (8FR, 6mm tip) (Medtronic Inc., Minneapolis, MN, USA). For the radiofrequency procedures, the catheter of choice in >80% of the procedures was a bidirectional DF Thermocool Smarttouch catheter (Biosense Webster, Diamond; Bar, CA, US)