1. Local Cerebral Blood Flow during the First Hour Following Acute Ligation of Multiple Arterioles in Rat Whisker Barrel Cortex
- Author
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Ling Wei, Kimberley Craven, Joseph Erinjeri, Griffith E. Liang, Daniel Bereczki, Carl M. Rovainen, Thomas A. Woolsey, and Joseph D. Fenstermacher
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AV transit time ,ischemia ,optical imaging ,quantitative autoradiography ,red blood cell flux ,somatosensory cortex. ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Abstract
The objectives are to measure the early time-course of the flows of blood, red cells, and plasma in brain tissue destined to infarct following arterial occlusion. The flux of fluorescent red blood cells (fRBCs) through venules and the arteriovenous transit times (AVTT) of fluorescein-labeled plasma albumin were periodically monitored in anesthetized adult Wistar rats before and up to 60 min after permanent ligations of several small branches of the middle cerebral artery. Of note, fRBC is a function of venular erythrocyte flow and volume, whereas AVTT is a function of plasma flow and volume in visible arteriole–capillary–venule units. In another group of anesthetized rats, local cerebral blood flow (lCBF) was measured 1 h after permanent arterial occlusion by [14C]iodoantipyrine (IAP) autoradiography. With this model of focal ischemia, the lesion is highly reproducible and involves part of the whisker barrel cortex. Infarction of this area was observed in 12 of 13 rats. From 10 to 60 min after arterial occlusion, AVTT was nearly four times longer in the ischemic barrel cortex than at the same site before ligations, and fRBC flux was 25%. Neither parameter changed appreciably over this time. After 60 min of ischemia, lCBF on the ipsilateral barrel cortex was 18% of that on the contralateral side and 15% of the sham control value for the same area of the barrel cortex. Since whole blood flow in the ischemic barrel cortex was
- Published
- 1998
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