PMID: 9192379Jun 1, 1997Paper

Multiparametric continuous monitoring of brain metabolism and substrate delivery in neurosurgical patients

Neurological Research
Alois ZaunerR Bullock

Abstract

Brain function and tissue integrity are highly dependent on continuous oxygen supply and clearance of CO2. Aerobic metabolism is the major energy source to normal brain, however, during hypoxia and ischemia, lactate accumulation may sometimes be seen, indicating anaerobic glycolysis after severe head injury. Current monitoring techniques often fail to detect such events which can affect substrate delivery to the injured brain. We have recently adapted a method for continuous monitoring of brain tissue pO2, pCO2, pH and temperature, using a single sensor. The multiparameter sensor is inserted into brain tissue, via a new three lumen bolt, together with a standard ventriculostomy catheter and a microdialysis probe. The system has been left in place as long as needed, but never more than 7 days. All readings were compared to clinical parameters, and outcome. Stable measurements could be obtained in the first group of 20 patients, after calibration and rigid fixation, using the new bolt. Severely head injured patients had brain oxygen levels of less than 25-30 mmHg for the first hours after injury. Thereafter two patterns could be seen. Patients with favorable outcome had a slow increase in brain oxygen, and brain CO2 decreased to ...Continue Reading

Citations

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