[Dilutional hyponatremia and convulsions after strenuous exercise].

Area of Science:

• Sports Medicine
• Emergency Medicine
• Clinical Toxicology

Background:

• Hyponatremia, a condition of low sodium levels, is often associated with excessive fluid intake.
• Exertional hyponatremia can occur in athletes and military personnel during prolonged physical activity.
• Dilutional hyponatremia is a known complication of overhydration, particularly in warm environments.

Observation:

• A 15-year-old female experienced fatigue and headache after walking in the desert on a warm day.
• She was treated with additional fluids, subsequently developing a generalized seizure.
• Upon admission, her sodium level was critically low (125 meq/l), and serum muscle enzymes were elevated.

Findings:

• The patient presented with symptoms consistent with severe hyponatremia.
• Elevated serum muscle enzymes indicated rhabdomyolysis, a serious muscle breakdown condition.
• The case demonstrates a link between excessive water consumption, exertion, and potentially life-threatening hyponatremia.

Implications:

• Overzealous water replacement without adequate salt replenishment poses significant health risks.
• Hyponatremia can manifest as seizures and rhabdomyolysis, especially after strenuous exercise.
• Medical professionals should consider exertional and dilutional hyponatremia in patients presenting with neurological symptoms after prolonged physical exertion.