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Related Experiment Videos

Exercise-associated hyponatraemia after a marathon: case series.

A M Goudie1, D S Tunstall-Pedoe, M Kerins

  • 1Swan District Hospital, Perth, Australia.

Journal of the Royal Society of Medicine
|July 4, 2006
PubMed
Summary

Exercise-associated hyponatraemia in marathon runners can present with delayed symptoms. While isotonic saline is common, hypertonic fluids may be more effective for symptomatic patients experiencing low serum sodium levels.

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Area of Science:

  • Sports Medicine
  • Clinical Physiology
  • Emergency Medicine

Background:

  • Exercise-associated hyponatraemia (EAH) is a potential complication for endurance athletes.
  • Marathon runners are particularly susceptible due to prolonged exertion and fluid intake.
  • Understanding EAH presentation and treatment is crucial for timely medical intervention.

Purpose of the Study:

  • To examine the clinical presentation, management strategies, and treatment outcomes of marathon runners with EAH.
  • To analyze the relationship between symptoms, fluid administration, and serum sodium levels in affected athletes.
  • To evaluate the efficacy of different saline solutions in correcting hyponatraemia.

Main Methods:

  • An observational case series design was employed.

Related Experiment Videos

  • Data were collected from runners presenting to St Thomas' Hospital after the 2003 London Marathon with altered mental state and serum sodium < 135 mmol/L.
  • Key data included presenting symptoms, fluid administration (0.9% and 1.8% saline), and clinical/biochemical response.

    • Main Results:

    • Fourteen marathon runners were diagnosed with EAH (serum sodium 116–133 mmol/L), with 11 exhibiting confusion.
    • Delayed presentation post-race was noted, with some athletes developing confusion after finishing.
    • Treatment with 0.9% saline and, in some cases, 1.8% saline, did not consistently raise serum sodium levels, though most patients improved symptomatically.

    Conclusions:

    • EAH can manifest with delayed neurological symptoms in marathon runners.
    • The effectiveness of isotonic saline in rapidly correcting EAH is questionable.
    • Early administration of hypertonic saline is suggested for symptomatic EAH patients.