We encountered a single case in which a transition between orthodromic reciprocating tachycardia with a concealed nodoventricular pathway and atrioventricular nodal reentrant tachycardia with a bystander nodoventricular pathway was observed.
Keywords: V‐V‐A response; accessory pathways; atrioventricular nodal reentrant tachycardia; nodoventricular pathway.
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