Unexpected Complete AV Block Following Transcatheter Ablation of a Left Posteroseptal Accessory Pathway.

Radiofrequency catheter ablation is the procedure of choice for the nonpharmacological treatment of AV connections that are responsible for debilitating tachycardia. This article describes a patient with a manifest left posteroseptal accessory pathway and recurrent syncopes in whom a transient complete AV block occurred after transcatheter radiofrequency ablation of the left posteroseptal pathway. Three electrical abnormalities were present in this patient: AV infra-Hisian block, a left posteroseptal accessory pathway, and a AV nodal reentry tachycardia. This case report reminds you that one should be prepared for all fall backs during catheter ablation. [ABSTRACT FROM AUTHOR]