Key result
The presence of an upper common pathway in the reentrant circuit of atrioventricular nodal reentrant tachycardia remains an unsettled concept in cardiac electrophysiology.
Discusses the electrophysiological evidence for an upper common pathway in the reentrant circuit of some patients with AVNRT.
AVNRT ablation strategies remain unchanged; leaves open mechanistic questions on upper common pathway in select reentrant circuits.
Atrioventricular nodal reentrant tachycardia (AVNRT) is the most common form of paroxysmal supraventricular tachycardia.1 The concept of dual atrioventricular (AV) nodal physiology as the underlying substrate is well established. Although AVNRT was originally described as being confined within the compact AV node, whether some atrial tissue is part of the reentrant circuit remains unsettled. Josephson and Kastor2 and Miller et al3 proposed an entire intranodal circuit with an upper common pathway (UCP) localized between the upper turnaround point within the AV node (upper junction of fast and slow pathways) and both atria.
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Hadid et al. (2018) studied Atrioventricular nodal reentrant tachycardia (AVNRT). The presence of an upper common pathway in the reentrant circuit of atrioventricular nodal reentrant tachycardia remains an unsettled concept in cardiac electrophysiology.
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