Differential diagnoses of regularly irregular narrow QRS tachycardias are AV re-entrant tachycardia (AVRT) with alternating antegrade AVN pathways, atypical AV nodal re-entrant tachycardia (AVNRT) with alternating antegrade AVN pathways, and atrial tachycardia (AT) with alternating antegrade AVN pathways or with Wenckebach periodicity.
Keywords: atrioventricular reentrant tachycardia; fast pathway; slow pathway.
© 2020 The Authors. Journal of Arrhythmia published by John Wiley & Sons Australia, Ltd on behalf of the Japanese Heart Rhythm Society.