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  • Title: Atrioventricular nodal supraventricular tachycardia with 2:1 block above the bundle of His.
    Author: Schmitt C, Miller JM, Josephson ME.
    Journal: Pacing Clin Electrophysiol; 1988 Jul; 11(7):1018-23. PubMed ID: 2457879.
    Abstract:
    A patient with narrow complex supraventricular tachycardia underwent electrophysiological study at which time a tachycardia was initiated which had 2:1 AV conduction, with block occurring above the His bundle. The modes of tachycardia initiation, as well as the responses to atrial and ventricular premature depolarizations during tachycardia, made a diagnosis of atrioventricular nodal reentry as the tachycardia mechanism. The unusual finding of 2:1 supra-His block suggests the presence of tissue situated between the tachycardia circuit and His bundle, and effectively excludes the possibility of a His-atrial bypass tract as the retrograde limb of the tachycardia circuit.
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