Central Cyanosis | Signs - MedSchool
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Central Cyanosis

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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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