Abstract
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.
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