According to the Clavien-Dindo classification, five grade II complications and four grade complications occurred. The technical success rate was 94%. Two tumors required a second session of cryoablation because of recurrence or residual tumor. Twelve months after treatment the overall survival was 96.7%, and the disease-free survival rate was 96.4%, including patients with recurrent genetic tumors. Renal function remained unchanged even in the subgroup of patients with a single kidney.


Midterm follow-up shows that percutaneous renal cryoablation is an effective and safe alternative technique for patients whose condition does not allow surgery and that renal function is preserved. Cryoablation combined with percutaneous thermal protection techniques allows treatment of more complex tumors. The treatment of choice for atrioventricular nodal reentrant tachycardia (AVNRT) is catheter ablation of the atrioventricular nodal slow pathway. The purpose of this study was to ascertain whether cryoablation (Cryo) with 6-mm-tip catheters is as effective as radiofrequency ablation (RF).


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