MedSchool: Ace Your OSCEsThe Medical Company
GET - On the App Store

Sick Sinus Syndrome



Sick sinus syndrome (SSS) occurs when the sinus node is not functioning correctly, due to either intrinsic or extrinsic causes.


  • Causes of Sinus Node Dysfunction

  • Idiopathic degeneration
  • Myocardial infarction
  • Infiltrative disease - sarcoidosis, amyloidosis, haemochromatosis
  • Connective tissue disease - SLE, scleroderma, RA
  • Cardiac surgery - valvular surgery, correction of congenital heart disease
  • Infections - Lyme disease, endocarditis


  • Manifestations of Sinus Node Dysfunction

  • Sinus bradycardia
  • Sinus arrhythmia
  • Sinus pause / arrest
  • Sinoatrial exit block
  • Tachy-brady syndrome
Next Page
Want more info like this?
  • Your electronic clinical medicine handbook
  • Guides to help pass your exams
  • Tools every medical student needs
  • Quick diagrams to have the answers, fast
  • Quizzes to test your knowledge
Sign Up Now

Snapshot: Initialising...