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• W1990885249 abstract "Subarachnoid hemorrhage (SAH) causes an inflammatory reaction and may lead to ischemic brain damage. Experimental ischemia has been shown to be connected with the alarm-reaction cytokines interleukin-1 receptor antagonist (IL-1Ra) and tumor necrosis factor-alpha (TNF alpha). Increased levels of these cytokines, however, have not been detected thus far in patients following an SAH event. For this reason daily cerebrospinal fluid (CSF) samples were collected from 22 consecutively enrolled patients with SAH and from 10 non-SAH patients (controls). The CSF samples were studied using immunoassays for IL-1Ra and TNF alpha to investigate whether an SAH caused increased cytokine levels. The mean IL-1Ra levels were significantly higher in patients with SAH who were in poor clinical condition on admission than in those who were in good condition (318 pg/ml vs. 82 pg/ml, p < 0.02). The IL-1Ra levels increased during delayed ischemic episodes and after surgery in patients who were in poor clinical condition. Significant increases in IL-1Ra and TNF alpha were detected during Days 4 through 10 in patients suffering from SAH who eventually had a poor outcome (p < 0.05). Patients with good outcomes and control patients had low levels of these cytokines. The levels of IL-1Ra increased after surgery in patients with Hunt and Hess Grades III through V, but not in those with Grade I or II. This finding indicates that patients in poor clinical condition have a labile biochemical state in the brain that is reflected in increased cytokine levels following the surgical trauma. Both IL-1Ra and TNF alpha are known to induce fever, malaise, leukocytosis, and nitric oxide synthesis and to mediate ischemic and traumatic brain injuries. The present study shows that levels of these cytokines increase after SAH occurs and that high cytokine levels correlate with brain damage. It is therefore likely that fever, leukocytosis, and nitric oxide synthesis are also mediated by IL-1 in patients suffering from SAH and it is probable that the inflammatory mediators contribute to brain damage." @default.
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• W1990885249 date "1997-08-01" @default.
• W1990885249 modified "2023-09-30" @default.
• W1990885249 title "Cerebrospinal fluid interleukin-1 receptor antagonist and tumor necrosis factor—α following subarachnoid hemorrhage" @default.
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• W1990885249 doi "https://doi.org/10.3171/jns.1997.87.2.0215" @default.
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