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目的探讨颈内动脉狭窄时各侧支循环途径出现的概率及与脑梗死的关系。资料与方法将脑血管造影(DSA)发现颈内动脉狭窄>70%的43例患者作为研究对象,并将其中23例脑梗塞患者作为症状组;20例无脑梗死患者作为无症状组。观察侧支循环的组成、Willis环是否变异及其组成血管的管径,分析侧支循环与脑梗死的关系。结果 Willis环代偿是主要的侧支循环,症状组前、后环的变异率大于无症状组,症状组前交通动脉的管径为(1.2540±0.1438)mm,小于无症状组(1.4306±0.2199)mm(P=0.006)。结论颈内动脉狭窄患者是否出现缺血性症状与Willis环的代偿能力相关,Willis环的代偿潜能与Willis环是否存在变异及前交通动脉、后交通动脉的管径有关。
Objective To explore the probability of occurrence of collateral circulation and its relationship with cerebral infarction in patients with internal carotid artery stenosis. Materials and Methods Forty-three patients with cerebral infarction who were diagnosed as having cerebral infarction by cerebral angiography (DSA)> 70% were included in the study. Twenty patients without cerebral infarction were selected as the asymptomatic group. To observe the composition of the collateral circulation, the Willis ring whether the variation and the diameter of the constituent blood vessels, analyze the relationship between collateral circulation and cerebral infarction. Results Willis annulus compensation was the main collateral circulation. The variation rate of anterior and posterior ring of the symptom group was higher than that of the asymptomatic group. The diameter of the anterior communicating artery in the symptom group was (1.2540 ± 0.1438) mm, less than that in the asymptomatic group (1.4306 ± 0.2199) ) mm (P = 0.006). Conclusions Whether ischemic symptoms occur in patients with internal carotid artery stenosis is related to the compensatory ability of Willis ring. The compensatory potential of Willis ring is related to the presence or absence of Willis ring and the diameter of anterior communicating artery and posterior communicating artery.