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(Stroke. 2008;39:2596.)
© 2008 American Heart Association, Inc.

Original Contributions

Temporal MRI Assessment of Intracerebral Hemorrhage in Rats

Robert A. Knight, PhD; Yuxia Han, BS; Tavarekere N. Nagaraja, PhD; Polly Whitton, MS; Jennifer Ding; Michael Chopp, PhD Donald M. Seyfried, MD

From the Departments of Neurology (R.A.K., P.W., M.C.), Neurosurgery (Y.H., J.D., D.M.S.), and Anesthesiology (T.N.N.), Henry Ford Hospital, Detroit, Mich; and the Department of Physics (R.A.K., M.C.), Oakland University, Rochester, Mich.

Correspondence to Robert A. Knight, PhD, Henry Ford Hospital, Department of Neurology–NMR Research, 2799 West Grand Blvd, Detroit, MI 48202. E-mail knight{at}neurnis.neuro.hfh.edu

Background and Purpose— MRI was used to evaluate the effects of experimental intracerebral hemorrhage (ICH) on brain tissue injury and recovery.

Methods— Primary ICH was induced in rats (n=6) by direct infusion of autologous blood into the striatum. The evolution of ICH damage was assessed by MRI estimates of T₂ and T_1sat relaxation times, cerebral blood flow, vascular permeability, and susceptibility-weighted imaging before surgery (baseline) and at 2 hours and 1, 7, and 14 days post-ICH. Behavioral testing was done before and at 1, 7, and 14 days post-ICH. Animals were euthanized for histology at 14 days.

Results— The MRI appearance of the hemorrhage and surrounding regions changed in a consistent manner over time. Two primary regions of interest were identified based on T₂ values. These included a core, corresponding to the bulk of the hemorrhage, and an adjacent rim; both varied with time. The core was associated with significantly lower cerebral blood flow values at all post-ICH time points, whereas cerebral blood flow varied in the rim. Increases in vascular permeability were noted at 1, 7, and 14 days. Changes in T_1sat were similar to those of T₂. MRI and histological estimates of tissue loss were well correlated and showed approximately 9% hemispheric tissue loss.

Conclusions— Although the cerebral blood flow changes observed with this ICH model may not exactly mimic the clinical situation, our results suggest that the evolution of ICH injury can be accurately characterized with MRI. These methods may be useful to evaluate therapeutic interventions after experimental ICH and eventually in humans.

Key Words: edema • intracerebral hemorrhage • MRI

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