High-Speed Hyponatremia: Exercise-Associated Hyponatremia in a Young Male Soldier

A 26-year-old male soldier in advanced individual training lost consciousness and experienced an acute mental status change during a long march on a warm day. He was found to be acutely hyponatremic with an elevated core body temperature. He was treated and his condition improved. He was admitted to the hospital and his condition was diagnosed as exercise-associated hyponatremia (EAH), heat-related injury, and mild exertional rhabdomyolysis. The pathophysiology of EAH is described along with current guidelines of treatment and prevention.