Successful treatment of tachycardia-induced cardiomyopathy secondary to dual atrioventricular nodal nonreentrant tachycardia using cryoablation

Dual atrioventricular nodal nonreentrant tachycardia (DAVNNT) is a rare tachycardia in which dual AV nodal physiology allows for a single sinus complex to conduct down both the fast and slow AV nodal pathways, resulting in 2 ventricular depolarizations. A recent review of the literature surrounding DAVNNT identified only 68 published cases. All ablations have been performed via radiofrequency ablation (RFA), with the exception of 1 cryoablation, which was unsuccessful and required further RFA. Here, we present a case of DAVNNT successfully treated with cryoablation with elimination of tachycardia and improvement of tachycardia-induced cardiomyopathy. To our knowledge, this is the first successful example of cryoablation for the treatment of DAVNNT.