Recent advancements in electroanatomic mapping (EAM) techniques have improved our understanding of the circuits involved in atrioventricular nodal reentrant tachycardia (AVNRT), moving beyond traditional mapping methods that were limited to only the triangle of Koch on the right septum.
A study utilized EAM with new tools to comprehensively map AVNRT in nine patients, revealing varied activation sites and confirming the role of both right and left septal structures in the circuit.
The findings indicated that AVNRT involves a circuit confined within a specific area known as the pyramid of Koch, utilizing the myocardial walls that separate the atrio-ventricular junction.