Key result
Regularly irregular narrow QRS tachycardias indicate AVRT, atypical AVNRT, or atrial tachycardia with alternating AVN pathways.
Highlights the differential diagnosis for tachycardia cycle length alternans in narrow QRS complex tachycardia.
Clinicians should consider these mechanisms in regularly irregular narrow QRS tachycardias; leaves open prospective validation of diagnostic criteria.
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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Kara et al. (2020) studied this question. Regularly irregular narrow QRS tachycardias have a differential diagnosis of AVRT, atypical AVNRT, and atrial tachycardia with alternating antegrade AVN pathways or Wenckebach periodicity.
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