The influence of ruptured cerebral aneurysm localization on the blood flowvelocity evaluated by transcranial Doppler ultrasonography

The relationship between changes of blood flow velocities in cerebral arter ies measured by transcranial Doppler ultrasonography and aneurysm localizat ion was investigated in a group of 165 patients after aneurysmal subarachno id hemorrhage (SAH). Mean blood flow velocities (MFV) in the middle cerebra l artery (MCA) and anterior cerebral artery (ACA) were registered. In patie nts with aneurysm of internal carotid artery and MCA (group A) statisticall y significant higher values of MFV from the Ist to the 5th day and on the 1 2th, 13th, 14th, 15th, and 19th day after SAH were found compared to patien ts with aneurysm of the anterior communicating artery, ACA, and pericallosa l artery (group B). Pathological values of MFV exceeding 120 cm sec(-1) in MCA were registered during 74 days in group A and during eight days in grou p B. Blood flow velocities in ACA were statistically significantly higher i n group B on the 2nd, 7th, 9th and 11 th day compared to group A. Pathologi cal values of MFV exceeding 90 cm sec(-1) in ACA were registered during nin e days in both groups. MFV differences between group A and group B in 38 pa tients subjected to delayed surgery were not observed The influence of aneu rysm localization was observed between the 7th and 14th day after SAH. Crit ical MFV values for vasospasm in the MCA should be 120 cm sec(-1) and in th e ACA 90 cm sec(-1).