[Reference values for measures of blood flow velocities and impedance indexes in healthy individuals through conventional transcranial Doppler].
OBJECTIVE
To establish reference values for measures of blood flow velocities and impedance indexes in healthy individuals through conventional transcranial Doppler (TCD) and to observe their variations in relation to the age and sex.


METHODS
88 asymptomatic volunteers were examined without antecedents of cardiac, peripheral or cerebrovascular diseases. The TCD were accomplished by the same examiner. The middle, anterior and posterior cerebral arteries were studied through the temporal acoustic window and the vertebral and basilar arteries through the suboccipital acoustic window. The values of mean velocity (MV), peak-systolic velocity (PSV), final diastolic velocity (FDV), resistance index (RI) and pulsatility index (PI) of each examined arterial segment were filed.


RESULTS
The reference limits found by us were similar to the described by other authors for all of the studied parameters. There was tendency of the flow velocities decrease and of the impedance indexes increase with moving forward of the age. The values of velocities in the women were superior to the found in men.


CONCLUSIONS
TCD was shown useful in the evaluation of hemodynamic cerebral for our population. Our results are similar to the other studies, so much in the reference values as in relationship with the age and the sex.
Barbosa
Maurício Fregonesi
MF
Departamento de Diagnóstico por Imagem, Universidade Federal de São Paulo, SP, Brazil. maufbarbosa@hotmail.com
Abdala
Nitamar
N
Carrete
Henrique
H
Nogueira
Roberto Gomes
RG
Nalli
Darcio Roberto
DR
Fonseca
José Roberto Falco
JR
Szejnfeld
Jacob
J
D000293:Adolescent; D000328:Adult; D000368:Aged; D001783:Blood Flow Velocity / Q000502:physiology*; D001921:Brain / Q000098:blood supply*; D002536:Cerebral Arteries / Q000000981:diagnostic imaging* / Q000502:physiology; D002560:Cerebrovascular Circulation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012016:Reference Values; D017585:Ultrasonography, Doppler, Transcranial