Stroke, Vol 23, 1304-1310, Copyright © 1992 by American Heart Association
K Minematsu, L Li, CH Sotak, MA Davis and M Fisher
BACKGROUND AND PURPOSE: Diffusion-weighted magnetic resonance imaging (DWI)
can quantitatively display focal brain abnormalities within minutes after
the onset of ischemia. We performed the present study to determine the
effects of 1 and 2 hours of temporary ischemia on DWI. METHODS: We examined
DWI and T2-weighted magnetic resonance images (T2WI) during and after 1 and
2 hours of temporary middle cerebral artery occlusion in rats (n = 10 for
each group). In a subgroup of four animals from each group, we employed
perfusion magnetic resonance imaging to monitor cerebral perfusion.
Neurological outcome and infarct size after survival for 24 hours were
compared between the groups and correlated with DWI and T2WI studies.
RESULTS: Perfusion studies qualitatively documented hypoperfusion and
reperfusion during and after temporary occlusion. Lesion size on DWI during
reperfusion was significantly less than that during ischemia for 1 (55%
decline, p less than 0.02) but not 2 hours of occlusion. The DWI signal
intensity ratio (intensity compared with that in the contralateral
homologous area) just before withdrawal of the occluder was significantly
less in regions where the hyperintensity disappeared after withdrawal than
in regions with persistent hyperintensity (p less than 0.002). The T2WI
studies revealed few or no abnormalities, except after 2 hours of
occlusion. The neurological outcome was significantly better in the 1- hour
than in the 2-hour group (p less than 0.05). Postmortem infarct volume was
significantly smaller in the 1-hour group than in the 2-hour group (p less
than 0.05). The postwithdrawal DWI accurately predicted infarct size (R =
0.96, p less than 0.0001). CONCLUSIONS: The present study indicates that
DWI can rapidly display not only irreversible but also reversible ischemic
brain damage and enhances the importance of DWI as a diagnostic modality
for stroke.
ARTICLES
Reversible focal ischemic injury demonstrated by diffusion-weighted magnetic resonance imaging in rats
Department of Neurology, University of Massachusetts Medical School, Worcester.
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