Age accounts for racial differences in ischemic stroke volume in a population-based study.
BACKGROUND
The stroke volume among black ischemic stroke patients in phase I of the population-based Greater Cincinnati/Northern Kentucky Stroke Study (GCNKSS) was smaller than reported among acute stroke studies, with a median stroke volume of 2.5 cm. However, it is not known if stroke volume was similar between black and white patients within the same study population.


METHODS
Phase II of the GCNKSS identified all ischemic strokes between July 1993 and June 1994. The stroke volume was estimated by study physicians using the modified ellipsoid method. Analysis of stroke volume by race, sex and age was performed for strokes with a measurable lesion of >or=0.5 cm(3).


RESULTS
Among verified cases of ischemic stroke, 334 patients were eligible for this analysis. There were 191 whites (57%) and 143 blacks (43%). The mean age was 69.4 years. The median stroke volume for all patients was 8.8 cm(3) (range 0.5-540), with a mean of 36.4 cm(3). Stroke volume was not different between men and women, and it tended to increase with age. Although stroke volume was significantly higher among whites, age was a confounding factor. Subsequent analysis of stroke volume stratified by age showed no difference between blacks and whites in any age group.


CONCLUSIONS
Our data show that most ischemic stroke lesions, regardless of the race, are of small size, and this may be an important reason for the low percentage of strokes treated currently with tissue-type plasminogen activator. The association of age with stroke volume requires further study.
Zakaria
Tarek
T
Department of Neurology, University of Cincinnati, Cincinnati, Ohio 45267-0525, USA.
Lindsell
Christopher J
CJ
Kleindorfer
Dawn
D
Alwell
Kathleen
K
Moomaw
Charles J
CJ
Woo
Daniel
D
Szaflarski
Jerzy P
JP
Khoury
Jane
J
Miller
Rosie
R
Broderick
Joseph P
JP
Kissela
Brett
B
D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D017668:Age of Onset; D000368:Aged; D000369:Aged, 80 and over; D044383:Black People / Q000706:statistics & numerical data*; D002545:Brain Ischemia / Q000208:ethnology*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007629:Kentucky / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D009820:Ohio / Q000453:epidemiology; D017678:Sex Distribution; D020521:Stroke / Q000208:ethnology*; D044465:White People / Q000706:statistics & numerical data*; D055815:Young Adult; D001741:Black or African American