Association between nonreentrant supraventricular tachycardia and atrioventricular node reentrant tachycardia: A presentation of dual AV node physiology

Persistent simultaneous conduction of P waves over a fast and a slow nodal pathway defines the nonreentrant type of supraventricular tachycardia, usua lly not associated with reciprocating movements. We report a unique associa tion between this uncommon tachycardia and a usual AV nodal reentrant tachy cardia, made possible by the existence of three different nodal pathways.