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Related Experiment Videos

Perfused microvascular morphometry during middle cerebral artery occlusion.

E Buchweitz-Milton1, H R Weiss

  • 1Department of Physiology and Biophysics, University of Medicine and Dentistry of New Jersey Robert Wood Johnson Medical School, Piscataway 08854.

The American Journal of Physiology
|September 1, 1988
PubMed
Summary
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Cerebral blood flow is reduced in ischemic rat cortex after middle cerebral artery ligation. Microvascular perfusion decreases significantly, indicating altered blood flow patterns, not vessel blockage.

Area of Science:

  • Neuroscience
  • Cerebrovascular Research
  • Ischemic Stroke Models

Background:

  • Middle cerebral artery (MCA) ligation is a common model for studying ischemic stroke.
  • Understanding microvascular changes is crucial for developing effective stroke therapies.

Purpose of the Study:

  • To compare arteriolar and capillary bed perfusion in ischemic versus contralateral cortex post-MCA ligation.
  • To investigate the structural and functional changes in the cerebral microvasculature during ischemia.

Main Methods:

  • Used fluorescein isothiocyanate (FITC)-dextran to identify perfused vascular beds.
  • Monitored regional cerebral blood flow (CBF) using [14C]iodoantipyrine.
  • Determined morphometric parameters by comparing FITC-labeled vessels with alkaline phosphatase-stained total microvasculature.

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Main Results:

  • Regional CBF was significantly lower in the MCA-occluded cortex (31 ml/min/100g) compared to the contralateral cortex (54 ml/min/100g).
  • No significant structural differences were found in the total microvascular bed.
  • The percentage of perfused arteriolar and capillary volume was significantly lower in the ischemic cortex.

Conclusions:

  • Reduced microvascular perfusion in the ischemic cortex is not due to vessel blockade.
  • Altered perfusion patterns may result from changes in perfusion cycles, pathway length, vasoconstriction, or partial obstruction.