Correlation of early reduction in the apparent diffusion coefficient of water with blood flow reduction during middle cerebral artery occlusion in rats

Anthony Mancuso, Hiroshi Karibe, William D. Rooney, Gregory J. Zarow, Steven H. Graham, Michael W. Weiner, Philip R. Weinstein

Research output: Contribution to journalArticle

44 Scopus citations

Abstract

To determine the relationship between reductions in the apparent diffusion coefficient of water (ADC) and in cerebral blood flow (CBF) during focal ischemia, we used diffusion‐weighted magnetic resonance (D‐MR) imaging and autoradiographic CBF analysis to examine rats subjected to 30 or 90 min of permanent middle cerebral artery (MCA) occlusion. In the 30‐min occlusion group (n = 10), the area with substantially reduced ADC (15% or more below the contralateral level [ADC15]) corresponded best to the area with CBF below 25 ml/100 g/min and was significantly smaller than the area with CBF below 50 ml/100 g/min (CBF50), a level associated with reduced protein synthesis and delayed necrosis (40 ± 13% versus 74 ± 8% of the ischemic hemisphere; P < 0.0001). In the 90‐min occlusion group (n = 6), the ADC15 area corresponded best to the CBF30 to CBF35 area and was again significantly smaller than the CBF50 area (54 ± 13% versus 73 ± 20%, P < 0.05). Thus, the area of substantially reduced ADC at 30 and 90 min represents only 53% and 74%, respectively, of the tissue at risk for infarction. These findings indicate a potential limitation in using early D‐MR imaging to predict stroke outcome.

Original languageEnglish (US)
Pages (from-to)368-377
Number of pages10
JournalMagnetic Resonance in Medicine
Volume34
Issue number3
DOIs
StatePublished - Sep 1995

Keywords

  • cerebral blood flow
  • diffusion‐weighted MRI
  • focal cerebral ischemia
  • rat

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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