Sinus node dysfunction: Clinical manifestations, diagnosis ... - UpToDate
https://www.uptodate.com/contents/sinus-node-dysfunction-clinical-manifestations-diagnosis-and-evaluation
WebJul 27, 2023 · Sinus node dysfunction (SND), also historically referred to as sick sinus syndrome (SSS) is characterized by dysfunction of the sinoatrial (SA) node that is often secondary to senescence of the SA node and surrounding atrial myocardium. Patients with SND are typically symptomatic with fatigue, lightheadedness, palpitations, presyncope, …
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