Article Text

Reminder of important clinical lesson
Overdrinking-induced hyponatraemia in the 2007 London Marathon
  1. Stephen B Draper1,
  2. Kate J Mori1,
  3. Simon Lloyd-Owen2,
  4. Timothy Noakes3
  1. 1
    University of Gloucestershire, Sport, Health and Social Care, Oxstalls Campus, Oxstalls Lane, Gloucester GL2 9HW, UK
  2. 2
    London Chest Hospital, Bonner Road, London E2 9JX, UK
  3. 3
    Sport Science Institute of South Africa, University of Cape Town, Cape Town, 7725, South Africa
  1. sdraper{at}


We report a case of overdrinking-induced hyponatraemia from the 2007 London Marathon. The patient was a 37-year-old experienced female marathon runner. She was brought to the emergency room more than 6 h after completing the marathon suffering from diarrhoea, vomiting and confusion, and was unable to recall any detail of the race. An arterial blood sample confirmed hyponatraemia ([Na+] 117 mmol.l−1) associated with hypokalaemia (serum potassium concentration 3.4 mmol.l−1) and respiratory alkalosis (pH 7.62, bicarbonate 16.1 mmol.l−1 and Pco2 2.14 kPa). A diagnosis of uncomplicated exercise-associated hyponatraemia due to voluntary overdrinking was made and the patient was catherised and treated with a slow (1 h) intra-venous infusion of 500 ml of 1.8% sodium chloride (NaCl) solution. The following morning her serum [Na+] had normalised at 135 mmol.l−1 and she was discharged in the afternoon. She has recovered fully without sequelae.

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  • Competing interests: none.

  • Patient consent: Patient/guardian consent was obtained for publication.