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Assessment of Hemodynamics Changes after Middle Cerebral Artery Stenosis or Occlusion Using Transcranial Doppler Ultrasound

Li Yi~1, Gong Xiping~1, Li Yao~2, Chen Meimei~1, Wang Yongjun~1(1.Department of Neurology, Beijing Tiantan Hospital, Capital University of Medical Sciences;2.Department of Neurology, Beijing Sixth Hospital)  
Objective To investigate the relationship between anterior/posterior cerebral artery flow velocity and the collateral flow patterns in patients with middle cerebral artery stenosis or occlusion. Methods 49 patients with unilateral MCA stenosis/occlusion identified by DSA were selected. Calculating the ratio of ACA flow velocity in affected side with MCA flow velocity in unaffected side and ratio of bilateral PCA flow velocity, compared the data collected from the healthy controls. Results According to the data, we found the patients'dV_ ACA/nV_ MCA(1.117±0.298)is significantly higher than the controls(0.801±0.147), P=0.027. Logistic regression analysis showed that the stenosal extent and value of dV_ ACA/nV_ MCA are two independent predicting factors of whether ACA collatery recruited. Conclusion TCD findings can partly reflect the collateral patterns in patients with MCA stenosis or occlusion.
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