Urinary protein binding does not affect response to furosemide in patients with nephrotic syndrome

Rajiv Agarwal, J. Christopher Gorski, Kimberly Sundblad, D. Craig Brater

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Response to loop diuretics in patients with nephrotic syndrome (NS) is subnormal. Studies in animal models of NS have suggested that binding of diuretic to urinary albumin is one of the mechanisms that may be operative in this diuretic resistance. To explore this hypothesis, 12 patients with NS were studied to determine whether displacement from urinary protein binding with sulfisoxazole would restore response to 120 mg of furosemide. The study was stopped after treating seven patients because it was clear that sulfisoxazole had no effect. Sodium excretion (mean ± SD) from furosemide alone was 239 ± 90 versus 240 ± 115 mEq/8 h with sulfisoxazole. Sulfisoxazole had modest effects on serum pharmacokinetics of furosemide but had no effect on either the time course of furosemide urinary excretion or overall amount excreted: 49 ± 15 mg versus 54 ± 12 mg for furosemide alone and furosemide plus sulfisoxazole, respectively. It is concluded that urinary protein binding of loop diuretics is not a major mechanism for the diuretic resistance of NS. In turn, strategies aimed at displacing such binding are unlikely to be clinically helpful.

Original languageEnglish
Pages (from-to)1100-1105
Number of pages6
JournalJournal of the American Society of Nephrology
Volume11
Issue number6
StatePublished - Jun 2000

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Sulfisoxazole
Furosemide
Nephrotic Syndrome
Protein Binding
Diuretics
Sodium Potassium Chloride Symporter Inhibitors
Albumins
Animal Models
Pharmacokinetics
Sodium
Serum

ASJC Scopus subject areas

  • Nephrology

Cite this

Urinary protein binding does not affect response to furosemide in patients with nephrotic syndrome. / Agarwal, Rajiv; Gorski, J. Christopher; Sundblad, Kimberly; Brater, D. Craig.

In: Journal of the American Society of Nephrology, Vol. 11, No. 6, 06.2000, p. 1100-1105.

Research output: Contribution to journalArticle

Agarwal, Rajiv ; Gorski, J. Christopher ; Sundblad, Kimberly ; Brater, D. Craig. / Urinary protein binding does not affect response to furosemide in patients with nephrotic syndrome. In: Journal of the American Society of Nephrology. 2000 ; Vol. 11, No. 6. pp. 1100-1105.
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