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建立了一类具有阶段结构并且含有出生函数的SIRS传染病模型,通过定性分析,得到了传染病最终消失和成为地方病的阈值,并且证明了无病平衡点的全局稳定性和正平衡点的局部稳定性. 相似文献
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Objective To study the relationships between cognitive impairment in patients with lacunar infarcts and quantitative CT measures and to determine the independent correlative factors of cognitive impairment. Methods Neuropsychological examination was conducted for 128 patients with acute lacunar infarct. Number, location, and volume of infarcts, cerebral atrophy index and severity of white matter lesions （WMLs） were measured and recorded. Results The number of lacunar infarcts in cognitive impairment （CI） group was significantly larger than that in cognitive normal （CN） group. Mean width of sulcns and sylvian fissure, index of frontal horn and ventricular-brain ratio （VBR） were significantly different in both groups. There were more patients with 3 grades or 4 grades WMLs in CI group （62%） than those in CN group （22%）. The total volume of lacunar infarcts showed no statistically significant difference. Logistic regression analysis indicated that the number of lacunar infarcts in frontal subcortex and thalamus, the volume of infarcts in anterior periventricular white matter, width of cerebral sulcns and sylvian fissure were correlated with cognitive impairment respectively. Additionally, age and education were correlative factors of cognitive impairment in patients with lacunar infarct. Conclusion Correlative factors of cognitive impairment in patients with lacunar infarct are not merely one feature, but a combination of infarct features （number, location, and volume）, cortical atrophy and host factors （age and education）. 相似文献
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Patients with lacunar infarcts are thought tohave an increased risk of cognitive i mpair ment anddementia[1].Cognitive i mpair ment is a predictor ofpoor functional outcome in stroke survivors[2].However,in patients with lacunar infarcts,thepathway leading to cognitive i mpair ment is notclear.According to the lacunar hypothesis,cogni-tive i mpair ment results fromincreased number andvolume of lacunes,especially whenlocated strategi-cally within frontal subcortical loops[3];while Feinet al[4]f… 相似文献
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