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Microsurgical Clip Obliteration of Middle Cerebral Aneurysm Using Intraoperative Flow Assessment
18:50

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Recirculation usually precedes malignant edema in middle cerebral artery infarcts

T H Nielsen1, N Ståhl, W Schalén

  • 1Department of Neurosurgery, Odense University Hospital, Odense, Denmark. troels.nielsen@ouh.regionsyddanmark.dk

Acta Neurologica Scandinavica
|April 13, 2012
PubMed
Abstract

Insights

Brain swelling in large strokes may start after blood flow returns, as indicated by normal glucose and high lactate/pyruvate ratios in affected brain tissue. This suggests potential mitochondrial dysfunction during stroke recovery.

Area of Science:

  • Neuroscience
  • Cerebrovascular Medicine
  • Metabolic Research

Background:

  • Large middle cerebral artery (MCA) infarcts can lead to severe brain swelling, cerebral herniation, and death, typically peaking 2-5 days post-stroke.
  • Understanding the metabolic changes in infarcted brain tissue is crucial for managing malignant brain swelling.

Purpose of the Study:

  • To investigate the metabolic profile, specifically compounds related to cerebral energy metabolism, within infarcted brain tissue in patients with large MCA infarcts.

Main Methods:

  • Forty-four patients undergoing decompressive hemicraniectomy (DHC) for malignant MCA infarcts were studied.
  • Cerebral energy metabolism was monitored using microdialysis in the infarcted and, in some cases, non-infarcted hemispheres.
  • Middle cerebral artery (MCA) blood-flow velocity was assessed bilaterally using transcranial Doppler ultrasound.

Main Results:

  • Interstitial glucose levels remained normal in both hemispheres throughout monitoring.
  • A significantly elevated lactate/pyruvate (LP) ratio was observed in the infarcted tissue immediately after DHC, persisting throughout the study.
  • MCA blood-flow velocities increased in the infarcted hemisphere post-DHC.

Conclusions:

  • Normal glucose levels and increased MCA blood flow suggest that malignant brain swelling may initiate after reperfusion, once the initial clot is resolved.
  • The sustained high LP ratio in the infarcted hemisphere points towards potential mitochondrial dysfunction contributing to brain swelling.

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