Li Y, Cai M, Li N, Zhang H, Huang E, Zhao J, Jin M, Zhang L. The value of slough in wounds for the diagnosis of microbiology cultivation.
Wound Repair Regen 2025;
33:e70002. [PMID:
39924720 DOI:
10.1111/wrr.70002]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2024] [Revised: 01/05/2025] [Accepted: 01/31/2025] [Indexed: 02/11/2025]
Abstract
Slough is not currently a recommended microbiology culture specimen. The aim of our work is to analyse the concordance of results between slough and swab samples for cultures. A single-centre, retrospective, cross-sectional study involving patients (n = 131) with hard to heal wounds was conducted from October 2022 to October 2023. Pairs of slough and swab samples were collected for microbiological analysis and subdivided depending on whether a relatively clean wound bed was obtained. Swab samples were collected using the Levine and deep pus methods, Cohen's κ coefficients calculated to evaluate concordance, and microbiological agreement analysed. Gram-stain results did not differ significantly between slough and swab samples (𝜒2 = 329.287, p = 0.688; concordance, κ = 0.879, p < 0.001); microbiological agreement was 90.1%. Samples from 87 patients with relatively clean wound beds generated excellent concordance between slough and Levine technique (κ = 0.867, p < 0.001; microbiological agreement, 89.7%). In 44 patients with slough and deep pus swab where a relatively clean wound bed could not be obtained, Gram-stain also demonstrated excellent concordance (κ = 0.898, p < 0.001; microbiology agreement, 90.9%). Our data provide evidence that slough is a reliable wound specimen from hard to heal wounds for microbiology culture.
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