An acquired manifestation of fasciculoventricular pathway following complex congenital heart disease repair

Common forms of supraventricular tachycardia (SVT) are well characterized and include atrioventricular nodal reentrant tachycardia (AVNRT), atrioventricular reentrant tachycardia (AVRT), and atrial tachycardia. In pediatric populations, AVRT is relatively more frequent compared with AVNRT, in contrast with adult populations in whom AVNRT is the most commonly encountered subtype of SVT. The primary cause of AVRT is typically congenital, resulting from the failure of regression in atrial and ventricular connections, which supports the reentry mechanism.