How is sinus node dysfunction (SND) characterized?

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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Sinus node dysfunction (SND) is characterized by dysfunction of the sinoatrial (SA) node that is often associated with senescence of the node and surrounding atrial myocardium. [1, 2] Although the term "sick sinus syndrome" (SSS) was first used to describe the sluggish return of SA nodal activity following electrical cardioversion, it is now commonly used to describe the inability of the SA node to generate a heart rate commensurate with the physiologic needs of an individual.

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