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Respiratory Exam
 
 

Central Cyanosis

July 1st, 2020
 
 
 
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Overview

Central cyanosis refers to a blue discolouration of the perioral skin and oral mucous membranes. If present, this is suggestive of elevated levels of deoxygenated haemoglobin (hypoxaemia).
  • Causes of Central Cyanosis

  • High altitude
  • Obstructive lung disease, pulmonary oedema, pneumonia, pulmonary embolism
  • Congenital heart disease
  • Methaemoglobinaemia / sulfhaemoglobinaemia / carboxyhaemoglobinaemia
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