AV Nodal Wenckebach Masquerading as Infra-His Wenckebach Due to Intra-atrial Conduction Delay

To the Editor I read with interest the article “Syncope With Bifascicular Block Due to Infra-Hisian Wenckebach Conduction abnormality” by Pham et al,¹ describing a patient presenting with syncope and bifascicular block who underwent electrophysiology study. The report describes the unusual phenomenon of intra-Hisian AV Wenckebach and posited this as the cause of syncope.