Related Experiment Videos
Hyponatremia associated with overhydration in U.S. Army trainees
K K O'Brien1, S J Montain, W P Corr
1Department of Family Practice and Community Medicine, Martin Army Community Hospital, Fort Benning, GA 31905, USA.
Military Medicine
|May 24, 2001
Summary
Over-hydration during military training can lead to dangerous hyponatremia. Aggressive fluid replacement practices, especially in the first four weeks, pose risks for soldiers and require policy revision.
Area of Science:
- Environmental Medicine
- Sports Medicine
- Emergency Medicine
Background:
- Hyponatremia, a condition of low serum sodium, can be exacerbated by heat and overhydration.
- Military training environments present unique challenges for fluid management due to heat stress and physical exertion.
Observation:
- A review of U.S. Army hospitalizations identified 17 cases of hyponatremia linked to heat-related injuries and overhydration between 1996-1997.
- All affected individuals were soldiers in training, with 77% of cases occurring within the first four weeks of their program.
- Nine patients exhibited excessive water intake, exceeding 2 quarts per hour, prior to hospitalization.
Findings:
- The average serum sodium level in affected soldiers was 122 +/- 5 mmol/L.
- Common symptoms included mental status changes (88%), emesis (65%), nausea (53%), and seizures (31%).
- Excessive water consumption was a common factor, often self-administered as field treatment.
Implications:
- Findings suggest that overly aggressive fluid replacement policies contributed to hyponatremia in soldiers.
- Revised fluid replacement strategies should account for climatic heat stress and physical activity levels.
- Field medical policies need to acknowledge the risk of overhydration and establish clear evacuation criteria for exertional illnesses.