Which ECG abnormalities are characteristic of sinus node dysfunction (SND)?

Updated: Nov 30, 2018
  • Author: Bharat K Kantharia, MD, FRCP, FAHA, FACC, FESC, FHRS; Chief Editor: Mikhael F El-Chami, MD  more...
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A conglomeration of electrocardiogram (ECG) abnormalities represent manifestation of SND, including [1, 3, 4] :

  • Sinus bradycardia

  • Sinus pause

  • Sinus arrest

  • SA nodal exit block

  • Inadequate heart rate response to physiologic demands during activity (chronotropic incompetence)

  • Supraventricular tachycardia (eg, atrial fibrillation, atrial flutter, and atrial tachycardia as part of the tachycardia-bradycardia syndrome) [1, 5]

When SND is associated with symptoms such as dizziness or syncope, SSS is a more clinically representative term. However, SND and SSS are often used interchangeably.

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