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Regional ischemia during cerebral bypass surgery
W E Hoffman1, F T Charbel, C Abood
1Anesthesiology Department, University of Illinois at Chicago, USA.
Surgical Neurology
|May 1, 1997
Summary
This study monitored brain tissue oxygen (PO2), carbon dioxide (PCO2), and pH during temporary artery occlusion. Multiple sensors effectively detected watershed ischemia, outperforming jugular bulb measurements.
Area of Science:
- Neuroscience
- Cerebrovascular Research
- Medical Technology
Background:
- Assessing brain tissue oxygen pressure (PO2), carbon dioxide pressure (PCO2), and pH is crucial for understanding regional ischemia.
- Cerebral occlusive disease necessitates advanced monitoring techniques during surgical interventions like superficial temporal artery (STA) to middle cerebral artery (MCA) bypass.
Observation:
- Two Paratrend 7 sensors were used to measure cortical PO2, PCO2, and pH in the MCA distribution.
- Jugular bulb oxygen saturation, MCA blood flow, and local perfusion were also monitored.
- Tissue responses were recorded during 100% oxygen ventilation, hypercapnia, and MCA occlusion.
Findings:
- Baseline measurements indicated ischemia in both monitored regions.
- Tissue PO2 increased during 100% oxygen ventilation, but hypercapnia did not improve local perfusion in one region.
- MCA occlusion led to ischemic changes (PO2, PCO2, pH) and an 80% decrease in local perfusion in one region, demonstrating watershed ischemia.
Implications:
- Changes in tissue PO2, PCO2, and pH correlate with local cerebral perfusion.
- Utilizing multiple tissue sensors offers superior detection of watershed ischemia compared to traditional jugular bulb oximetry.
- This monitoring approach can enhance intraoperative management and understanding of cerebral ischemia during neurovascular procedures.