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Hypertonic saline: patterns of and guidelines for use
R M Culpepper1, B D Clements, S R Pence
1Department of Internal Medicine, University of South Alabama, College of Medicine, Mobile 36617.
Insights
Hypertonic saline (HS) is often used for hyponatremia, but guidelines are unclear. This study found HS was typically used for chronic, asymptomatic cases, suggesting it should be reserved for acute, symptomatic hyponatremia.
Area of Science:
- Nephrology
- Internal Medicine
- Critical Care Medicine
Background:
- Appropriate use guidelines for hypertonic (3%) saline (HS) in treating hyponatremia are not well-defined.
- Hyponatremia management requires careful consideration of serum sodium levels and patient symptoms.
Purpose of the Study:
- To review the utilization of hypertonic saline infusions for hyponatremia treatment.
- To assess the appropriateness of HS use based on patient presentation and timing of administration.
Main Methods:
- Retrospective review of all hypertonic saline infusions over a 1-year period in a university hospital.
- Analysis of patient data including serum sodium levels, duration of hyponatremia (acute vs. chronic), and presence of symptoms.
Main Results:
- 14 HS infusions were reviewed; 11 cases involved chronic hyponatremia and only 3 were acute.
- Symptomatic hyponatremia was present in only 2 patients.
- Significant delays were observed between serum sodium measurements and HS initiation/monitoring (average >5 hours before, >6 hours after).
Conclusions:
- Hypertonic saline should be reserved for patients with symptomatic, likely acute, hyponatremia.
- Clear target serum sodium levels and correction timeframes are needed.
- Prompt initiation and frequent monitoring of HS infusions are crucial for effective and safe management.
Abstract:
Guidelines for appropriate use of hypertonic (3%) saline (HS) for the treatment of hyponatremia are ill-defined. We reviewed each infusion of HS in a 400-bed university hospital over a 1-year period. Of the 14 infusions, the hyponatremia (average serum sodium [Na+] 19.9 +/- 6.7 mEq/L) was chronic in 11 cases and acute in only 3. In only 2 patients were there symptoms possibly attributable to hyponatremia. On the average, more than 5 hours elapsed from the last measured serum Na+ level to the initiation of HS infusion, and the next measured serum Na+ value came more than 6 hours later. HS should be reserved for symptomatically hyponatremic patients, most of whom become acutely hyponatremic. A target level for the serum Na+ should be determined and a time-course for correction set. The infusion should be started promptly and monitored frequently for the effect on the serum Na+ level and patient symptoms.