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Bilateral Common Carotid Artery Occlusion as an Adequate Preconditioning Stimulus to Induce Early Ischemic Tolerance to Focal Cerebral Ischemia
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The importance of cerebral ischemia during carotid endarterectomy

E Zampella1, R B Morawetz, H A McDowell

  • 1Division of Neurosurgery, University of Alabama Medical Center, Birmingham.

Neurosurgery
|November 11, 1991
PubMed

Insights

Cerebral ischemia during carotid endarterectomy is monitored using Xenon-133 (133Xe) clearance and electroencephalogram (EEG). Ischemia depth correlated with EEG abnormalities, but not directly with complications.

Area of Science:

  • Neurosurgery
  • Neurology
  • Vascular Surgery

Background:

  • Cerebral ischemia during carotid endarterectomy is a significant concern.
  • The predictive value of intraoperative ischemia for post-operative complications is debated.

Purpose of the Study:

  • To investigate the relationship between cerebral ischemia, electroencephalogram (EEG) changes, and complications during carotid endarterectomy.
  • To assess the utility of Xenon-133 (133Xe) clearance and EEG monitoring in predicting outcomes.

Main Methods:

  • Studied 369 patients undergoing 431 carotid endarterectomies without shunts.
  • Utilized Xenon-133 (133Xe) clearance for cerebral blood flow assessment.
  • Employed electroencephalogram (EEG) monitoring to detect cerebral dysfunction.

Main Results:

  • 133Xe clearance indicating ischemia severity did not predict complications (P=0.841).
  • A strong correlation was found between 133Xe clearance and EEG abnormalities (P<0.0001).
  • In patients with EEG changes, higher blood flow during occlusion correlated with increased complication risk (P<0.002).

Conclusions:

  • Cerebral ischemia depth, measured by 133Xe clearance, does not directly predict complications after carotid endarterectomy.
  • EEG monitoring is crucial for identifying cerebral ischemia during the procedure.
  • The interplay between blood flow reduction, EEG changes, and complication development requires further investigation.

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