YKL-40 levels in cerebrospinal fluid serve as a diagnostic biomarker for post-neurosurgical bacterial meningitis in patients with stroke.

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Previous studies have reported that YKL-40 can serve as a biomarker of infectious diseases and different stroke types. However, evidence supporting its role in diagnosing post-neurosurgical bacterial meningitis (PNBM) remains lacking METHODS: A total of 110 patients with stroke who underwent neurosurgical treatment were recruited. Among these, 36 were diagnosed with PNBM based on the results of bacterial culture/Gram staining or cerebrospinal fluid (CSF) characteristics. CSF levels of YKL-40 and other biomarkers with potential diagnostic utility for PNBM were statistically analysed using univariate and logistic regression models. Receiver operating characteristic (ROC) analysis was performed to investigate diagnostic efficiency. According to univariate analysis, CSF levels of glucose, total protein, white blood cells, polymorphocytes, and YKL-40, as well as the CSF-to-blood glucose ratio, were significantly different between the PNBM and non-PNBM groups. Logistic regression analysis revealed that glucose (p = 0.026), total protein (p = 0.028), and YKL-40 (p = 0.006) levels in the CSF may have independent diagnostic utility for PNBM. Among the three biomarkers, CSF-to-blood glucose (area under the receiver operating characteristic curve [AUC] 0.9208) and YKL-40 (AUC 0.9587) demonstrated strong diagnostic utility. CSF levels of YKL-40, glucose, and total protein played independent roles in the diagnosis of PNBM in patients with stroke.