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Aetiology of hypoxaemia

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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Possible causes of hypoxaemia include:

  • cardio-respiratory disorders
    • hypoventilation
    • a mismatch of ventilation-perfusion
    • venous to arterial shunt
    • diffusion impairment

  • low inspired O2 e.g. high altitude

  • a pathological desaturation of venous blood e.g. may rarely be caused by carboxyhaemoglobin

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