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Pilot Study Identifying Predictive Factors of Diuretic Effectiveness in Emergency Department Patients with Fluid
Christoph Hüser1, Lena Hartnack2, Matthias Johannes Hackl1
1Emergency Department; Department II of Internal Medicine and Center for Molecular Medicine Cologne.
The Journal of Emergency Medicine
|August 3, 2025
Summary
Urine sodium and conductivity can predict diuretic success in emergency department patients with fluid overload. These simple tests may help guide diuretic therapy for better outcomes.
Area of Science:
- Emergency Medicine
- Nephrology
- Cardiology
Background:
- Diuretic therapy in emergency department (ED) patients with fluid overload presents challenges.
- Predicting response to diuretics is crucial for effective management.
Purpose of the Study:
- To identify clinical and laboratory parameters predicting adequate response to initial diuretic therapy in ED patients with edema.
- To evaluate urine sodium and conductivity as predictors of diuretic success.
Main Methods:
- Prospective, observational study of ED patients with cardiac or renal edema.
- Intravenous furosemide administered per protocol; urine output recorded.
- Analysis of clinical factors, urine sodium, and conductivity for predicting diuresis (≥ 600 mL in 6 h).
Main Results:
- 101 patients analyzed; median 6-h urine output was 1100 mL.
- Higher systolic blood pressure, eGFR, urine sodium, and conductivity predicted successful diuresis.
- Urine sodium > 72.5 mmol/L (PPV 93%) and conductivity > 12.0 mS/cm (PPV 89%) indicated sufficient diuresis.
Conclusions:
- Urine sodium and electrical conductivity are associated with diuretic success in ED patients.
- These easily measurable parameters show potential as predictive markers for diuretic response.
- Further studies are warranted to validate these findings.
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