NDLI: Functional magnetic resonance imaging of reorganization in rat brain after stroke.

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Functional magnetic resonance imaging of reorganization in rat brain after stroke.

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Functional magnetic resonance imaging of reorganization in rat brain after stroke.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Mandeville, J. B. Ozdag, F. M. Moskowitz, M. A. Ren, J. Rosen, B. R. Dijkhuizen, R. M. Wu, O. Finklestein, S. P.
Description	Author Affiliation: Dijkhuizen RM ( MGH-NMR Center, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, 13th Street, Building 149, Charlestown, MA 02129, USA. rickd@NMR.MGH.Harvard.edu);
Abstract	Functional recovery after stroke has been associated with brain plasticity; however, the exact relationship is unknown. We performed behavioral tests, functional MRI, and histology in a rat stroke model to assess the correlation between temporal changes in sensorimotor function, brain activation patterns, cerebral ischemic damage, and cerebrovascular reactivity. Unilateral stroke induced a large ipsilateral infarct and acute dysfunction of the contralateral forelimb, which significantly recovered at later stages. Forelimb impairment was accompanied by loss of stimulus-induced activation in the ipsilesional sensorimotor cortex; however, local tissue and perfusion were only moderately affected and cerebrovascular reactivity was preserved in this area. At 3 days after stroke, extensive activation-induced responses were detected in the contralesional hemisphere. After 14 days, we found reduced involvement of the contralesional hemisphere, and significant responses in the infarction periphery. Our data suggest that limb dysfunction is related to loss of brain activation in the ipsilesional sensorimotor cortex and that restoration of function is associated with biphasic recruitment of peri- and contralesional functional fields in the brain.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	22
Volume Number	98
Language	English
Publisher	National Academy of Sciences
Publisher Date	2001-10-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Brain Physiopathology Magnetic Resonance Imaging Stroke Animals Blood Volume Pathology Cerebrovascular Circulation Rats, Sprague-Dawley Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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