Predictive Value of Mean Flow Velocity by TCD in Early Cerebral Vasospasm in Aneurysmal Subarachnoid Hemorrhage

"TCD examination was performed using DWL-EZ-Dop machine Compumedics GmbH, Singen, Germany. TCD utilizes low-frequency pulsed insonation (2 MHz) to measure blood flow velocity within proximal cerebral arteries, obtaining systolic and diastolic peaks and mean flow velocities (MFV). MFV is defined as (systolic + diastolic)/3 + diastolic velocities, according to Alexandrov et al..~Initial TCD examination was done after admission serving as a baseline state for cerebral circulation. Follow-up TCD examinations was done at fixed intervals on the first, third, fifth, seventh and tenth days of the onset of SAH."