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Diagnostic Accuracy of Point-of-Care Gram Stains in Obstructive Pyelonephritis due to Ureteral Stones.
Hayano, Satoshi; Hidaka, Toshiya; Tadakuma, Risako; Kashima, Masayuki.
Afiliación
  • Hayano S; Department of Internal Medicine, Japanese Red Cross Kumamoto Hospital, Kumamoto, Japan.
  • Hidaka T; Department of Clinical Laboratory, Japanese Red Cross Kumamoto Hospital, Kumamoto, Japan.
  • Tadakuma R; Department of Clinical Laboratory, Japanese Red Cross Kumamoto Hospital, Kumamoto, Japan.
  • Kashima M; Department of Internal Medicine, Japanese Red Cross Kumamoto Hospital, Kumamoto, Japan.
Open Forum Infect Dis ; 11(3): ofae026, 2024 Mar.
Article en En | MEDLINE | ID: mdl-38444822
ABSTRACT

Background:

The diagnostic utility of point-of-care (POC) Gram stains for obstructive pyelonephritis with hydronephrosis is not well established. The current study aimed to assess the diagnostic accuracy of urine Gram stains in patients with obstructive pyelonephritis due to ureteral stones.

Methods:

A retrospective observational study was conducted on patients with obstructive pyelonephritis admitted to our hospital between January 2011 and December 2021. The diagnostic accuracy of Gram stains was evaluated based on the severity of hydronephrosis, including Gram stains performed by both trained physicians and microbiological technicians.

Results:

After analyzing 210 patients, POC Gram stains of bladder urine presented a sensitivity, specificity, positive predictive value, and negative predictive value of 86.8%, 81.8%, 93.7%, and 66.7%, respectively, for gram-negative rods and 65.7%, 83.4%, 48.9%, and 91.0%, respectively, for gram-positive cocci. The agreement between POC Gram stains and urine culture was good for gram-negative rods, with a kappa (κ) coefficient of 0.637 and agreement rate of 85.6%, and moderate for gram-positive cocci, with a κ coefficient of 0.435 and agreement rate of 80%. The agreement between POC Gram stains and bladder urine culture results for gram-negative rods was higher in the mild hydronephrosis group (κ coefficient = 0.677) than in the severe hydronephrosis group (κ coefficient = 0.466). Discrepancies in Gram stain results between physicians and technicians were observed in 21 of 180 cases (11.7%).

Conclusions:

POC Gram stains for gram-negative rods may be a useful diagnostic tool for obstructive pyelonephritis, particularly in cases of mild hydronephrosis.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Open Forum Infect Dis Año: 2024 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Open Forum Infect Dis Año: 2024 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Estados Unidos