Stroke, Vol 25, 390-396, Copyright © 1994 by American Heart Association
PJ Martin, DH Evans and AR Naylor
BACKGROUND AND PURPOSE: Transcranial color-coded sonography is a new
development in noninvasive cerebral vascular imaging. Reference data using
this technique are described. METHODS: Blood velocities and pulsatility and
resistance indices were determined in the anterior cerebral, middle
cerebral, posterior cerebral, vertebral, and basilar arteries in 115
volunteers after correction for the angle of insonation. RESULTS: Of 1265
basal arterial segments, 1053 were insonated (83%). The vertebral (98%),
basilar (92%), middle cerebral (84%), and posterior (P1) cerebral arteries
(84%) were the most successfully insonated, with the anterior (73%) and
posterior (P2) cerebral arteries (72%) the least successfully insonated.
Mean and end- diastolic blood velocities decreased significantly with age
in all vessels (middle cerebral artery mean velocity: 20 to 39 years, 74
cm/s [71-76]; > 60 years, 58 cm/s [55-61], P < .0001; mean with 95%
confidence intervals), and peak systolic velocity decreased significantly
except in the posterior (P2) cerebral artery. Blood velocities were higher
in women except in the > 60-year group. Velocities showed the least
interhemispheric asymmetry in the middle cerebral artery (r = .85 and r =
.83, peak and mean velocities, respectively) and the greatest asymmetry in
the posterior (P2) cerebral artery (r = .58 and r = .59, peak and mean
velocities, respectively). Pulsatility and resistance indices increased
significantly with age in all vessels (middle cerebral artery pulsatility
index: 20 to 39 years, 0.84 [0.82-0.87], > 60 years, 0.97 [0.93-1.02], P
< .0001; middle cerebral artery resistance index: 20 to 39 years, 0.55
[0.54-0.56], > 60 years, 0.62 [0.60-0.64], P < .0001). CONCLUSIONS:
Transcranial color- coded sonography can image the basal cerebral arteries
and distinguish vertebral from basilar artery flow and enables pulsed
Doppler interrogation with correction for the angle of insonation.
ARTICLES
Transcranial color-coded sonography of the basal cerebral circulation. Reference data from 115 volunteers
Department of Neurology, Leicester Royal Infirmary, UK.
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