Evaluation of posterior cerebral artery flow velocity by transcranial color-coded real-time sonography

Using transcranial color-coded real-time sonography (TCCS), we measured pea k-systolic how velocities (PSVs) in segment P2 of 102 posterior cerebral ar teries (PCAs) in 61 patients, with angiography. We divided 102 PCAs into fo ur groups: control group (n = 70) with no significant stenotic lesions; PCS group (n = 7) with stenosis greater than or equal to 50% of P2 segment; Co l (+) group (n = 13) and Col (-) group (n = 12) had occlusive lesions in th e carotid system with or without collateral how from PCA to the middle cere bral artery through the leptomeningeal anastomosis, In the PCS group, PSV ( 255.7 +/- 67.2 cm/s) was higher than in the other three groups (p < 0.0001) . PSV was higher in the Col (+) group (127.6 +/- 31.2) than in the Col (-) (86.6 +/- 20.1) and control (83.8 +/- 24.8) groups (p < 0.001). The measure ment of PSV in the P2 segment of PCA using TCCS may help to identify a sign ificant stenosis in PCA, (C) 2000 World Federation for Ultrasound in Medici ne & Biology.