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DeSalles, A A; Kontos, H A; Ward, J D; Marmarou, A; Becker, D P
Neurosurgery 20, Številka: 2Journal Article
It is well established that low cerebrospinal fluid (CSF) pH and high CSF lactate concentration indicate the development of brain acidosis after severe human head injury. However, there is no direct evidence that tissue acidosis actually occurs. We measured brain extracellular pH (pHe) in three patients undergoing operation for the evacuation of acute subdural hematomas. A pH-sensitive polymer membrane electrode was inserted 500 micron into the cerebral cortex close to the damaged area. The pHe values obtained were correlated with ventricular CSF acid-based parameters and extension of the brain lesion. The CSF pH was higher than the pHe in all cases; the pHe was particularly low in areas of contusion or compression by mass lesion. The effect of focal brain tissue acidosis on clinical course after severe head injury is discussed.
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in: SICRIS
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