Neurology 2002;59:867-873
© 2002 American Academy of Neurology
Volumetric MRI predicts rate of cognitive decline related to AD and cerebrovascular disease
D. Mungas, PhD,
B. R. Reed, PhD,
W. J. Jagust, MD,
C. DeCarli, MD,
W. J. Mack, PhD,
J. H. Kramer, PhD,
M. W. Weiner, MD,
N. Schuff, PhD and
H. C. Chui, MD
From the Department of Neurology (Drs. Mungas, Reed, Jagust, and DeCarli), School of Medicine, University of California, Davis; Veterans Administration Northern California Health Care System (Drs. Mungas, Reed, and Jagust); Departments of Preventive Medicine (Dr. Mack) and Neurology (Dr. Chui), School of Medicine, University of Southern California; Departments of Psychiatry (Drs. Kramer and Weiner) and Radiology (Drs. Weiner and Schuff), School of Medicine, University of California, San Francisco; and Magnetic Resonance Unit (Drs. Weiner and Schuff), Department of Veterans Affairs Medical Center, San Francisco, California.
Address correspondence and reprint requests to Dr. Dan Mungas, Department of Neurology, 4860 Y Street., Suite 3700, Sacramento, CA 95817; e-mail: dmmungas{at}ucdavis.edu
Objective: To examine volumetric MRI correlates of longitudinal cognitive decline in normal aging, AD, and subcortical cerebrovascular brain injury (SCVBI).
Background: Previous cross-sectional studies examining the relationship between cognitive impairment and dementia have shown that hippocampal and cortical gray matter atrophy are the most important predictors of cognitive impairment, even in cases with SCVBI. The authors hypothesized that hippocampal and cortical gray matter volume also would best predict rate of cognitive decline in cases with and without SCVBI.
Methods: Subjects were recruited for a multicenter study of contributions to dementia of AD and SCVBI. The sample (n = 120) included cognitively normal, cognitively impaired, and demented cases with and without lacunes identified by MRI. Cases with cortical strokes were excluded. Average length of follow-up was 3.0 years. Measures of hippocampal volume, volume of cortical gray matter, presence of subcortical lacunes, and volume of white matter hyperintensity were derived from MRI. Random effects modeling of longitudinal data was used to assess effects of baseline MRI variables on longitudinal change in a measure of global cognitive ability.
Results: Cortical gray matter atrophy predicted cognitive decline regardless of whether lacunes were present. Hippocampal atrophy predicted decline only in those without lacunes. Neither lacunes nor white matter hyperintensity independently predicted decline.
Conclusions: Results suggest that cortical atrophy is an index of disease severity in both AD and subcortical cerebrovascular brain injury and consequently predicts faster progression. Hippocampal volume may index disease severity and predict progression in AD. The absence of this effect in cases with lacunes suggests that this group is etiologically heterogeneous and is not composed simply of cases of AD with incidental stroke.
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Correspondence:
Read all Correspondence
- Volumetric MRI predicts rate of cognitive decline related to AD and cerebrovascular disease.
- Wiesje M. van der Flier, et al.
- Neurology Online, 30 Dec 2002
[Full text]
- Reply to van der Flier
- Dan Mungas
- Neurology Online, 16 Jan 2003
[Full text]
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