Transcranial cytokine gradients in patients requiring intensive care after acute brain injury

British Journal of Anaesthesia
E G McKeatingLuciana Mascia

Abstract

After acute brain injury there may be increased intracranial production of cytokines, with activation of inflammatory cascades. We have sought to determine if a transcranial cytokine gradient was demonstrable in paired sera of 32 patients requiring intensive care after acute brain injury. The difference between concentrations of IL-1 beta, IL-6, IL-8 and TNF alpha in jugular venous and arterial serum was measured on admission, and at 24, 48 and 96 h after the primary injury. There were no differences in IL-1 beta, IL-8 or TNF alpha, but median gradients of 6.7 and 11.5 pg ml-1 for IL-6 were demonstrated in the traumatic brain injury (n = 22) and subarachnoid haemorrhage (n = 10) groups, respectively (normal values in serum < 4.7 pg ml-1; P < 0.001 both groups). This suggests that there is significant production of IL-6 by intracranial cells after acute brain injury. Therapy directed towards combatting the negative effects of IL-6 may potentially benefit patients who have sustained an acute brain injury.

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