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(Stroke. 1996;27:2312-2320.)
© 1996 American Heart Association, Inc.
Articles |
Experimental Intracerebral Hemorrhage in Rats
Magnetic Resonance Imaging and Histopathological Correlates
the Departments of Pathology (M.R. Del B.) and Radiology and Pharmacology (H.-J.Y., R.B., J.P.), The University of Manitoba and Health Sciences Centre (Winnipeg).
Correspondence to Dr J. Peeling, Department of Pharmacology and Therapeutics, University of Manitoba, 770 Bannatyne Ave, Winnipeg, Manitoba, R3E 0W3, Canada. E-mail jim@bionmr.mrrl.umanitoba.ca.
Background and Purpose Intracerebral hemorrhage is associated with a considerable proportion of strokes and head injuries. The mechanism of brain cell injury associated with hemorrhage may be different from that due to pure ischemia. Therefore, it is essential that models of intracerebral hemorrhage be developed and well characterized. The purpose of this study was to obtain high-field MR images of rat brain at progressive times after induction of intracerebral hemorrhage and to correlate the images with behavior and histological evolution.
Methods Intracerebral hemorrhage was induced in rats by injection of bacterial collagenase and heparin into the caudate nucleus. Histopathological changes and corresponding MR images were studied from 30 minutes to 3 weeks after injection. Behavioral changes were also followed for 3 weeks.
Results Histological correlation showed that MR is capable of resolving the accumulation and degeneration of the hematoma, a centripetal wave of neutrophils infiltrating from the surrounding tissue beginning at 12 hours, and centripetal invasion of macrophages beginning at 48 hours. Widespread white matter edema was clearly evident on MR images for 1 week after the hemorrhage. Medium-sized striatal neurons were lost in the tissue surrounding the hematoma. Behavioral improvement was rapid during resolution of the edema but incomplete at 3 weeks.
Conclusions MR images correlate very well with histological changes in this experimental model of intracerebral hemorrhage and can therefore be used to follow changes due to drug treatments in vivo. The intense neutrophilic response to this lesion may contribute to neuronal injury at the periphery of the hematoma.
Editorial Comment
Magnetic Resonance Imaging and Histopathological Correlates
Department of Molecular and Experimental MedicineThe Scripps Research InstituteLa Jolla, Calif
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