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Official publication of the Indian Society of Nephrology
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Daily Urinary Sodium Excretion Monitoring in Critical Care Setting: A Simple Method for an Early Detection of Acute Kidney Injury

1 Ageing Biology Unit, Hospital Italiano de Buenos Aires, Argentina; Facultad de Ciencias de la Salud, Universidad Simón Bolívar, Barranquilla, Colombia
2 Clínica de la Costa - Barranquilla, Colombia
3 Family Medicine Division, Hospital Italiano de Buenos Aires, Argentina
4 Facultad de Ciencias de la Salud, Universidad Simón Bolívar, Barranquilla; Doctorado en Ciencias Biomédicas, Universidad del Valle, Cali, Colombia
5 Facultad de Ciencias de la Salud, Universidad Simón Bolívar; Clínica de la Costa - Barranquilla, Colombia

Correspondence Address:
Carlos G Musso,
Potosí 4265, Ciudad Autónoma de Buenos Aires- C1199

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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ijn.IJN_53_20

Introduction: Making an early diagnosis of acute kidney injury (AKI) is crucial. Classical biomarkers are not capable of early detection of AKI, but novel biomarkers that do have this capability are expensive and not universally available. This prospective study attempts to mitigate these limitations through the evaluation of daily urine analysis on patient admitted to a critical care unit in order to detect early AKI. Methods: Daily urinary indices were measured on every patient admitted to the intensive care unit (ICU) from the time of admission until his/her discharge from the ICU or death. This renal monitoring consisted of daily blood and spot morning urine samples in order to measure creatinine, urea, sodium, chloride and potassium in order to calculate the fractional excretion of sodium (FENa), chloride, urea and potassium. The data collected on these patients in the previous days was analyzed to determine whether or not there was a significant statistical difference in the urinary indices one day before the clinical diagnosis of AKI (day – 1) and 2 days before the diagnosis (day – 2). The statistical test applied was a single rank test, using as a limit of significance a value of P < 0.05. Results: Of the 203 patients included, 61 developed AKI. A statistical significant difference was documented only in the value of urinary sodium (UNa) and FENa between day-1 (one day before AKI clinical diagnosis) and day-2 (two days before AKI clinical diagnosis). Conclusion: Daily monitoring of UNa and FENa detected a significant change in their basal values 24 hours before clinical diagnosis of AKI was made.

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Indian Journal of Nephrology
Published by Wolters Kluwer - Medknow
Online since 20th Sept '07