Abstract
Most patients with paroxysmal supraventricular tachycardia (SVT) have atrioventricular (AV) nodal reentrant SVT using the slow AV nodal pathway for anterograde conduction and the fast pathway for retrograde conduction. Patients with dual pathways may rarely have a form of SVT in which anterograde conduction occurs over the fast pathway and retrograde conduction occurs over the slow pathway. 1 Recent reports suggest the unusual form of AV nodal reentry really represents a tachycardia using the normal AV node anterogradely and a bypass tract with AV nodal-like properties retrogradely. 2 Therefore, we report a patient with unusual AV nodal SVT accompanied by infra-Hisian block during the tachycardia, which excludes the possibility of such a bypass tract.
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