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Clinical features

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

  • Early features of EAH include: nausea, vomiting, headache, bloating, tissue puffiness

  • Later features of EAH include: confusion, disorientation, seizures, coma, pulmonary oedema

As the severity of EAH progresses, more clinical features of hyponatremic encephalopathy can develop as a result of cerebral oedema (brain swelling), including alteration of mental status (eg, confusion, disorientation, agitation, delirium), seizures, respiratory distress (pulmonary edema), obtundation, coma and death

Usually individuals are asymptomatic symptoms until Na+ < 130 mmol

As many as 10% of ultra distance runners might be hyponatraemic (1)

Contributors (September 2010):

  • Dr Volker Scheer (GP Locum), Dr Andrew Murray (Marathon Medical Services)


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