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Cerebral interstitial tissue oxygen tension, pH, HCO3, CO2
F T Charbel1, W E Hoffman, M Misra
1Department of Neurosurgery, University of Illinois at Chicago 60612-7329, USA
Surgical Neurology
|October 7, 1997
Summary
Continuous monitoring of brain oxygenation and CO2 levels using the Paratrend 7 system is valuable for neurosurgical patients. This method effectively assesses tissue oxygen tension, aiding in recovery after brain injury.
Area of Science:
- Neuroscience
- Medical Technology
- Critical Care Medicine
Background:
- Monitoring the injured brain is crucial after trauma, subarachnoid hemorrhage, or surgery.
- Optimal recovery of injured cerebral tissue depends on oxygen and glucose delivery and metabolite clearance.
- These factors are influenced by tissue blood flow and metabolism.
Purpose of the Study:
- To evaluate the effectiveness of the Paratrend 7 sensor for continuous monitoring of brain tissue parameters.
- To establish normal and critical ranges for tissue oxygen tension (PO2), carbon dioxide tension (PCO2), and pH in neurosurgical patients.
Main Methods:
- Utilized a single, compact polyethylene sensor (Paratrend 7) for continuous measurement.
- Measured cerebral oxygen tension (PO2), CO2 (PCO2), pH, and temperature.
- Applied the sensor during surgery and in the intensive care unit for neurosurgical patients.
Main Results:
- Established normal ranges: PO2 33 +/- 11 mm Hg, PCO2 48 +/- 7 mm Hg, pH 7.19 +/- 0.11.
- Identified critical values: tissue PO2 < 10 mm Hg, PCO2 > 60 mm Hg, pH < 6.8.
- Reported no complications, with risks comparable to intracranial pressure monitors.
Conclusions:
- Assessment of interstitial cerebral oxygen saturation provides significant intraoperative and postoperative value.
- The Paratrend 7 system is an effective tool for measuring tissue cerebral oxygen tension, CO2, pH, and temperature.
- Continuous monitoring aids in managing neurosurgical patients and optimizing recovery.