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Sinus Arrest



Sinus arrest is the temporary interruption of sinoatrial node automaticity, that may occur due to intrinsic or extrinsic factors affecting the sinoatrial node.


  • ECG Findings

  • A pause of at least three seconds, without P waves or QRS complexes
  • An escape rhythm may be present
  • Diagnosis


  • Causes of Sinus Arrest

  • 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
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