Stattin Norinder B, Sandberg T, Norrby R. Renal concentrating capacity in female outpatients with symptomatic urinary tract infection.
ACTA ACUST UNITED AC 2006;
39:483-7. [PMID:
16303725 DOI:
10.1080/00365590500342950]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
OBJECTIVE
Renal concentrating capacity (RCC) has been used as a tool in the diagnosis of the site of urinary tract infection (UTI). In this study, RCC was measured in women with symptoms of UTI in relation to the clinical picture and the bacterial species isolated.
MATERIAL AND METHODS
In 633 outpatients aged > or =18 years with symptoms of UTI, a renal concentration test with desmopressin was performed at baseline. The test was repeated after antibiotic treatment in a subset of patients with osmolality values below the reference levels at entry. The bacterial species were identified and patients were classified as having either pyelonephritis or cystitis.
RESULTS
RCC was reduced in patients infected with Escherichia coli or Staphylococcus saprophyticus compared to those who had negative urine cultures and increased after antibiotic treatment. Patients with symptoms of both pyelonephritis and cystitis had reduced RCC: 44/68 (65%) and 205/457 (45%), respectively.
CONCLUSIONS
These findings demonstrate a considerable overlap in RCC between patients with pyelonephritis and cystitis, making the osmolality test unreliable for the purpose of diagnosis of the site of UTI.
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