A diagnostic challenge of dual atrioventricular nodal nonreentrant tachycardia revealed by ambulatory electrocardiographic monitoring: a case report - Takeaways - MDSpire

A diagnostic challenge of dual atrioventricular nodal nonreentrant tachycardia revealed by ambulatory electrocardiographic monitoring: a case report

  • By

  • Zhiqin Ma

  • Jianzhou Tian

  • Ping Yuan

  • Jun Shen

  • May 8, 2026

  • 0 min

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  • 1

    Dual atrioventricular nodal nonreentrant tachycardia (DAVNNT) is a rare arrhythmia characterized by simultaneous conduction through fast and slow AV nodal pathways.

  • 2

    A 57-year-old woman presented with respiratory symptoms but was later found to have DAVNNT through 24-hour Holter monitoring.

  • 3

    Holter monitoring revealed variable PR intervals and 1:2 AV conduction, suggesting DAVNNT despite initial misinterpretation of her ECG.

  • 4

    This case emphasizes the importance of noninvasive electrocardiographic monitoring in diagnosing DAVNNT before invasive procedures.

  • 5

    Recognition of DAVNNT is crucial when atrial activity is associated with more ventricular activations than atrial depolarizations.

Original Source(s)

A diagnostic challenge of dual atrioventricular nodal nonreentrant tachycardia revealed by ambulatory electrocardiographic monitoring: a case report

  • by Zhiqin Ma, Jianzhou Tian, Ping Yuan, Jun Shen

  • May 8, 2026

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