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Hyponatremia in the emergency department
1Department of Internal Medicine, Chang Gung Memorial Hospital, Kaohsiung, Taiwan, ROC. stectlee@ms13.hinet.net
The American Journal of Emergency Medicine
|June 1, 2000
Summary
Hyponatremia, a low serum sodium level, is common in emergency departments. Mortality risk increases with lower sodium levels, emphasizing the need for accurate diagnosis and identifying underlying causes.
Area of Science:
- Internal Medicine
- Emergency Medicine
- Clinical Diagnosis
Background:
- Hyponatremia is a significant clinical sign associated with various diseases and high mortality rates.
- Understanding its prevalence, causes, and prognosis in emergency settings is crucial for patient outcomes.
Purpose of the Study:
- To prospectively assess the prevalence, causes, and prognosis of hyponatremia in adult internal medicine patients in an emergency department.
- To determine the relationship between serum sodium levels, mortality, and underlying conditions.
Main Methods:
- A prospective study was conducted over 2 months at a major hospital in southern Taiwan.
- Included 3,784 adult internal medicine patients, defining hyponatremia as serum sodium < 134 mEq/L.
- Followed patients until discharge, analyzing demographic, clinical, and laboratory data.
Main Results:
- 166 patients (4.39%) had hyponatremia; 65% were hypovolemic.
- Overall mortality was 17.9%, increasing with lower serum sodium levels.
- True hyponatremia prevalence was 3.83% after excluding hyperglycemic cases; gastrointestinal diseases were the most common cause.
Conclusions:
- Hyponatremia is a frequent emergency department diagnosis with significant mortality linked to sodium levels.
- Accurate diagnosis requires adjusting for hyperglycemia; most cases have identifiable underlying diseases, not iatrogenic causes.