The ablation of parahisian accessory pathways is a challenge because of the risk of atrioventricular block. In this observation, we describe the case of an eleven-year-old girl presenting a parahisian accessory pathway treated successfully by cryoablation. It is a pediatric case, in which, the accessory pathway and the nodo-hisian conduction pathway where superposed in anatomic and electrophysiological terms. Cryoablation should be the method of choice of ablation in pediatric patients.
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