Differences in the evolution of the ischemic penumbra in stroke-prone spontaneously hypertensive and Wistar-Kyoto rats

McCabe, C. , Gallagher, L., Gsell, W., Graham, D. , Dominiczak, A. F. and Macrae, I. M. (2009) Differences in the evolution of the ischemic penumbra in stroke-prone spontaneously hypertensive and Wistar-Kyoto rats. Stroke, 40(12), pp. 3864-3868. (doi:10.1161/STROKEAHA.109.559021)

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Publisher's URL: http://dx.doi.org/10.1161/STROKEAHA.109.559021

Abstract

<p><b>Background and Purpose:</b> Stroke-prone spontaneously hypertensive rats (SHRSP) are a highly pertinent stroke model with increased sensitivity to focal ischemia compared with the normotensive reference strain (Wistar-Kyoto rats; WKY). Study aims were to investigate temporal changes in the ischemic penumbra in SHRSP compared with WKY.</p> <p><b>Methods:</b> Permanent middle cerebral artery occlusion was induced with an intraluminal filament. Diffusion- (DWI) and perfusion- (PWI) weighted magnetic resonance imaging was performed from 1 to 6 hours after stroke, with the PWI-DWI mismatch used to define the penumbra and thresholded apparent diffusion coefficient (ADC) maps used to define ischemic damage.</p> <p><b>Results:</b> There was significantly more ischemic damage in SHRSP than in WKY from 1 to 6 hours after stroke. The perfusion deficit remained unchanged in WKY (39.9±6 mm<sup>2</sup> at 1 hour, 39.6±5.3 mm<sup>2</sup> at 6 hours) but surprisingly increased in SHRSP (43.9±9.2 mm<sup>2</sup> at 1 hour, 48.5±7.4 mm<sup>2</sup> at 6 hours; P=0.01). One hour after stroke, SHRSP had a significantly smaller penumbra (3.4±5.8 mm<sup>2</sup>) than did WKY (9.7±3.8, P=0.03). In WKY, 56% of the 1-hour penumbra area was incorporated into the ADC lesion by 6 hours, whereas in SHRSP, the small penumbra remained static owing to the temporal increase in both ADC lesion size and perfusion deficit.</p> <p><b>Conclusions:</b> First, SHRSP have significantly more ischemic damage and a smaller penumbra than do WKY within 1 hour of stroke; second, the penumbra is recruited into the ADC abnormality over time in both strains; and third, the expanding perfusion deficit in SHRSP predicts more tissue at risk of infarction. These results have important implications for management of stroke patients with preexisting hypertension and suggest ischemic damage could progress at a faster rate and over a longer time frame in the presence of hypertension.</p>

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Gallagher, Mrs Lindsay and Macrae, Professor I Mhairi and Graham, Dr Delyth and Dominiczak, Professor Anna and McCabe, Dr Chris
Authors: McCabe, C., Gallagher, L., Gsell, W., Graham, D., Dominiczak, A. F., and Macrae, I. M.
Subjects:R Medicine > R Medicine (General)
College/School:College of Medical Veterinary and Life Sciences > Institute of Cardiovascular and Medical Sciences
College of Medical Veterinary and Life Sciences > Institute of Neuroscience and Psychology
Journal Name:Stroke
Publisher:American Heart Association
ISSN:0039-2499
ISSN (Online):1524-4628
Published Online:24 September 2009
Copyright Holders:Copyright © 2009 American Heart Association
First Published:First published in Stroke 40(12): 3864-3868
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
464051Genomics and proteomics of hypertension and its vascular complications: the pathwayomic strategies.Anna DominiczakBritish Heart Foundation (BHF)RG/07/005/23633Institute of Cardiovascular and Medical Sciences
455001Imaging the ischaemic penumbra using BOLD MRI with oxygen challenge as a biotracerI MacraeMedical Research Council (MRC)G0700439Institute of Neuroscience and Psychology