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Metabolic causes

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

The main metabolic causes of a transient loss of consciousness are:

  • hypoglycaemia:
    • a common cause in diabetics
    • other causes such as insulinoma are rare

  • hypocapnia:
    • hyperventilation causes vasoconstriction of cerebral vessels and loss of consciousness

  • hypoxia:
    • this is rare, even in severe asthma syncope is unusual

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