Overdrinking-induced hyponatraemia in the 2007 London Marathon

Area of Science:

• Sports Medicine
• Clinical Case Study
• Endocrinology

Background:

• Exercise-associated hyponatraemia (EAH) is a critical condition observed in endurance athletes.
• Voluntary overdrinking is a significant risk factor for developing EAH.

Purpose of the Study:

• To report a case of severe hyponatraemia induced by excessive fluid intake in a marathon runner.
• To illustrate the clinical presentation and successful management of overdrinking-induced hyponatraemia.

Main Methods:

• A case report of a 37-year-old female marathon runner presenting with symptoms of hyponatraemia.
• Clinical assessment including arterial blood gas analysis and electrolyte levels.
• Treatment with intravenous 1.8% sodium chloride solution.

Main Results:

• The patient presented with severe hyponatraemia (117 mmol/L), hypokalaemia, and respiratory alkalosis.
• Intravenous infusion of 500 ml 1.8% NaCl over 1 hour led to normalization of serum sodium levels (135 mmol/L) by the next morning.
• Complete recovery without sequelae was achieved.

Conclusions:

• Excessive fluid consumption during endurance events can lead to dangerous hyponatraemia.
• Rapid correction with hypertonic saline is an effective treatment for severe exercise-associated hyponatraemia.
• This case underscores the importance of balanced hydration strategies for marathon runners.