单侧大脑中动脉狭窄或闭塞侧支循环与脑缺血的关系

目的探讨单侧大脑中动脉(MCA)狭窄或闭塞患者侧支循环代偿与脑缺血的关系。方法将27例单侧大脑中动脉狭窄或闭塞患者根据有无侧支代偿分为2组,分别对2组患者的脑血流灌注显像结果进行对比分析。结果17例单侧大脑中动脉狭窄患者中4例有侧支代偿,13例无侧支代偿。10例单侧大脑中动脉闭塞患者中7例有侧支代偿,3例无侧支代偿。当大脑中动脉受阻时,侧支代偿多见于血管闭塞患者,而无侧支代偿多见于动脉狭窄患者(χ2=5.632,P=0.018)。2组患者额、颞、顶、枕叶及基底节的血流灌注差异无统计学意义,但2组患者丘脑的血流灌注差异有统计学意义(t=-2.393,P=0.025)。结论当单侧大脑中动脉狭窄或闭塞时,由于侧支循环的存在,脑灌注损伤与血管狭窄程度表现不一致,联合应用2种脑血管造影和脑血流灌注方法可对MCA受阻有全面认识。

Study on the Relation between Collateral Circulation and Cerebral Ischemia in Patients with Unilateral Middle Cerebral Artery Stenosis or Occlusion

Objective To study the relation between collateral circulation and ischemic brain lesions in patients with unilateral middle cerebral artery stenosis or occlusion.Methods Twenty-seven patients with unilateral middle cerebral artery stenosis or occlusion were divided into two groups according the status of collateral circulation.Comparisons were made between the results of the two groups in cerebral blood flow perfusion imaging.Results In 4 patients with unilateral middle cerebral artery stenosis and 7 patie...