title: White matter hyperintensities on MRI in the neurologically nondiseased elderly. Analysis of cohorts of consecutive subjects aged 55 to 85 years living at home.
abstract: OBJECTIVE
  We undertook this study to evaluate the frequency and risk factors of white matter hyperintensities seen on T2-weighted MR imaging. We examined cohorts of neurologically nondiseased elderly subjects participating in a general-community study, the Helsinki (Finland) Aging Brain Study. Cohorts of consecutive subjects aged 55, 60, 65, 70, 75, 80, and 85 years (n = 20, 18, 20, 18, 19, 18, and 15, respectively; total, n = 128) were divided into a young-old (age < 75 years, n = 76) group and an old-old (age > or = 75 years, n = 52) group.
  
  
  METHODS
  Frequency of hyperintensities seen on T2-weighted axial and coronal MR images (0.02 T) was rated using a four-point scale in periventricular and centrum semiovale areas.
  
  
  RESULTS
  The majority of the subjects showed only mild white matter hyperintensities, which were more frequent in the periventricular areas. Age was the most important factor to explain the presence of hyperintensities. A logistic regression analysis related periventricular hyperintensities in the entire group to central atrophy (odds ratio [OR], 4.7; 95% confidence interval [CI], 1.7 to 12.9) and silent infarcts (OR, 5.6; 95% CI, 1.0 to 19.8); among the young-old, hyperintensities related to diabetes (OR, 17.0; 95% CI, 1.9 to 154.2) and central atrophy (OR, 14.7; 95% CI, 3.5 to 61.8). Centrum semiovale hyperintensities related in the entire group to cardiac arrhythmia (OR, 4.0; 95% CI, 1.0 to 15.5), central atrophy (OR, 3.9; 95% CI, 1.2 to 12.4), and silent infarcts (OR, 3.6; 95% CI, 1.0 to 12.5).
  
  
  CONCLUSIONS
  These mild white matter hyperintensities in the neurologically nondiseased elderly related especially to age and also to concomitant silent infarcts, atrophy, and some vascular risk factors. The known factors, however, explained only part of the variation. The young-old and old-old groups showed different associations. In contrast to former assumptions, the presence of white matter hyperintensities among the aged is likely to be linked to other as yet unidentified age-related factors.
authors.affiliation: Department of Neurology, University of Helsinki, Finland.
authors.forename: A
authors.initials: A
authors.lastname: Ylikoski
authors.forename: T
authors.initials: T
authors.lastname: Erkinjuntti
authors.forename: R
authors.initials: R
authors.lastname: Raininko
authors.forename: S
authors.initials: S
authors.lastname: Sarna
authors.forename: R
authors.initials: R
authors.lastname: Sulkava
authors.forename: R
authors.initials: R
authors.lastname: Tilvis
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000473:pathology*; D001145:Arrhythmias, Cardiac / Q000473:pathology; D001284:Atrophy; D001921:Brain / Q000473:pathology*; D002540:Cerebral Cortex / Q000473:pathology; D002544:Cerebral Infarction / Q000473:pathology; D002552:Cerebral Ventricles / Q000473:pathology; D015331:Cohort Studies; D003920:Diabetes Mellitus / Q000473:pathology; D005260:Female; D006798:Housing; D006801:Humans; D016015:Logistic Models; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009460:Neurologic Examination; D012307:Risk Factors