期刊
JOURNAL OF CEREBRAL BLOOD FLOW AND METABOLISM
卷 33, 期 10, 页码 1556-1563出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/jcbfm.2013.107
关键词
animal models; diffusion-weighted MRI; focal ischemia; glucose; hyperglycemia
资金
- Chief Scientist Office (Scotland)
- Medical Research Council, UK
- Scottish Imaging Network: A Platform for Scientific Excellence
- Medical Research Council PhD studentship
- Chief Scientist Office [CZB/4/746] Funding Source: researchfish
Poststroke hyperglycemia is associated with a poor outcome yet clinical management is inadequately informed. We sought to determine whether clinically relevant levels of hyperglycemia exert detrimental effects on the early evolution of focal ischemic brain damage, as determined by magnetic resonance imaging, in normal rats and in those modeling the 'metabolic syndrome'. Wistar Kyoto (WKY) or fructose-fed spontaneously hypertensive stroke-prone (ffSHRSP) rats were randomly allocated to groups for glucose or vehicle administration before permanent middle cerebral artery occlusion. Diffusion-weighted imaging was carried out over the first 4 hours after middle cerebral artery occlusion and lesion volume calculated from apparent diffusion coefficient maps. Infarct volume and immunostaining for markers of oxidative stress were measured in the fixed brain sections at 24 hours. Hyperglycemia rapidly exacerbated early ischemic damage in both WKY and ffSHRSP rats but increased infarct volume only in WKY rats. There was only limited evidence of oxidative stress in hyperglycemic animals. Acute hyperglycemia, at clinically relevant levels, exacerbates early ischemic damage in both normal and metabolic syndrome rats. Management of hyperglycemia may have greatest benefit when performed in the acute phase after stroke in the absence or presence of comorbidities.
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