Advanced

AJNR - American Journal of Neuroradiology

This Article Abstract Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Krejza, J. Articles by Melhem, E. R. Search for Related Content PubMed PubMed Citation Articles by Krejza, J. Articles by Melhem, E. R.

Age and Sex Variability and Normal Reference Values for the V_MCA/V_ICA Index

Jaroslaw Krejza^a,c, Piotr Szydlik^c, David S. Liebeskind^b, Jan Kochanowicz^a,c, Oleg Bronov^a, Zenon Mariak^c and Elias R. Melhem^a

^a Department of Radiology, University of Pennsylvania, Philadelphia
^b Department of Neurology, University of Pennsylvania, Philadelphia
^c Department of Radiology, Bialystok Medical Academy, Poland
^d Department of Neurosurgery, Bialystok Medical Academy, Poland

View larger version (23K): [in a new window]   FIG 1. Distribution of values of the VMCA/VICA index, calculated from the mean MCA and ipsilateral extracranial ICA velocities in women and men in three age groups (<40, 40–60, and >60 years) and in 304 healthy subjects. In women, median value of the index increases with age to 60 years, whereas in men, it is relatively stable. The minimum and maximum values of the variable are indicated by the whiskers (solid lines) of each diagram. The median value is indicated by a central horizontal and the lower and upper qualities by the corresponding horizontal ends of the box. *Indicates outlying value, inconsistent with other points in the sample.

View larger version (28K): [in a new window]   FIG 2. Distribution of mean blood flow velocities in the MCA for women and men in the three age groups and in 304 healthy subjects. Mean velocity is higher in women up to the age of 60 years, and in older subjects, mean velocities are substantially lower and similar in both sexes. A description of box-and-whisker plot is provided in Figure 1.

View larger version (27K): [in a new window]   FIG 3. Distribution of mean blood flow velocities in the extracranial ICA for women and for men in the three age groups and in all 304 healthy subjects. Mean velocity is substantially high in women up to the age of 60 years; after this time, velocity decreases significantly. A different pattern of age dependence is seen in men: flow velocity is almost stable throughout the life span. A description of box-and-whisker plot is provided in Figure 1.