Fractional excretion of uric acid as a predictor for saline responsiveness in long-term kidney transplant patients.

Abstract:

BACKGROUND/AIMS:Subclinical hypovolemia may contribute to allograft dysfunction in long-term kidney transplant (KT) patients. In order to predict responsiveness to saline hydration, indices for tubular transport were investigated. METHODS:Fifty-four clinically euvolemic long-term KT patients with recently aggravated azotemia were given intravenous hydration as follows: 0.9% saline 5 ml/kg over 1 h, followed by 0.9% saline 1 ml/kg/h over 12 h and 1 liter of 0.45% saline over the next 24 h. Serum and urine data were collected and analyzed to assess responses. RESULTS:In all patients, saline hydration relieved azotemia, as shown by blood urea nitrogen (46.9 ± 17.2 vs. 39.3 ± 15.4 mg/dl; p < 0.01) and serum creatinine levels (2.9 ± 1.1 vs. 2.5 ± 1.1 mg/dl; p < 0.01) on day 0 versus day 2. In 38 patients, serum creatinine did not increase in the following month (70% responders). Compared with the nonresponders, the responders had a higher urine-to-plasma creatinine ratio and lower fractional excretion of sodium, uric acid and urea at admission. Multivariate logistic regression analysis revealed that responsiveness to saline hydration was independently associated with lower fractional excretion of uric acid. CONCLUSION:Subclinical hypovolemia should be considered in long-term KT patients with azotemia of unexplainable causes. Fractional excretion of uric acid may predict responsiveness to saline hydration.

journal_name

Kidney Blood Press Res

authors

Choi JW,Park JS,Koo TY,Lee CH,Kang CM,Kim GH

doi

10.1159/000341124

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

627-33

issue

6

eissn

1420-4096

issn

1423-0143

pii

000341124

journal_volume

35

pub_type

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