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中文摘要：
目的探讨脑血管储备能力（cerebrovascular reserve，cVR）与一侧颈内动脉狭窄程度的关系。方法选择脑梗死患者85例，其中颈内动脉狭窄组59例，对照组26例。分别通过吸入5％CO2和95％O2混合气体诱发高碳酸血症，计算大脑中动脉血流速度变化。结果颈内动脉狭窄组患者CVR较对照组明显降低[（22．47±12．45）％vs（37．25±11．77）％，P〈0．01]。cVR与颈内动脉狭窄程度呈负相关（CI=-0．6587，P〈0．01）。颈内动脉狭窄是CVR下降的独立危险因素（OR=5．149，95％CI：2．682～9．858，P〈0．01）。结论颈内动脉狭窄是影响CVR的独立危险因素，检测cVR可能预测颈内动脉狭窄程度。
英文摘要：
Objective To study the relation between cerebrovascular reserve（CVR） and unilateral internal carotid artery（ICA） stenosis. Methods Eighty-five patients with cerebral infarction（ineluding 59 patients with ICA stenosis） served as an ICA stenosis group and 26 patients without ICA stenosis served as a control group in this study. Hypercapnia was induced by inhaling 5% CO2 and 95%O2 mixed gas. The blood flow rate in middle cerebral artery was measured. Results The CVR was significantly lower in ICA stenosis group than in control group （22.47%± 12.45% vs 37.25%±11.77% ,P〈0. 01）. The CVR was positively correlated with the severity of ICA stenosis（CI=-0. 6587, P〈0.01）, indicating that ICA stenosis is an independent factor for the reduced CVR（OR=5.149,95%CI：2. 682--9. 858,P〈0. 01）. Conclusion ICA stenosis is an independent factor for CVR and detection of CVR can predict the severity of ICA stenosis.
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