Assessment of the Hemodynamic Changes in Arteriovenous Malformations by Transcranial Doppler sonography

概要

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We assessed the hemodynamic changes of AVM by calculating the blood flow (BF) of the middle cerebral artery (MCA) and the common carotid artery (CCA) in 16 supratentorial arteriovenous malformations (AVMs) and 7 in controls. Flow velocity (FV) was measured by transcranial Doppler sonography (TCD) and the diameter of the artery (R) was measured from the carotid angiography. The blood flow (BF) in MCA and CCA was calculated from the equation FV×πR<SUP>2</SUP>. Sequential changes of blood flow volume and flow velocity were evaluated before operation and after surgery in 6 patients. FV and BF of MCA were increased proportionally to the size of AVM, but BF of MCA showed greater increase than flow velocity, especialy in large AVMs, because the feeding artery of MCA was still dilated after excision of AVM. FV and BF of CCA showed the same tendency, but their increase was much less than that of MCA. In large AVMs, FV of MCA was increased 7 times and FV of CCA, 3 times as much as the controls. From the above findings, it may be concluded that the measurement of BF in the feeding artery can give more information on the hemodynamic changes in AVM than FV.
日本脳神経超音波学会の論文