Investigating the clinico-anatomical dissociation in the behavioral variant of Alzheimer disease
- Vrije Univ., Amsterdam (Netherlands). Amsterdam Neuroscience. Dept. of Neurology. Alzheimer Center Amsterdam
- Vrije Univ., Amsterdam (Netherlands). Amsterdam Neuroscience. Dept. of Neurology. Alzheimer Center Amsterdam
- King's College, London (United Kingdom). School of Biomedical Engineering and Imaging Sciences
- Vrije Univ., Amsterdam (Netherlands). Dept. of Radiology and Nuclear Medicine; Univ. College London (United Kingdom). Dept. of Medical Physics and Biomedical Engineering. Center for Medical Image Computing
- Univ. of California, San Francisco, CA (United States). Dept. of Neurology, Memory and Aging Center
- King's College, London (United Kingdom). School of Biomedical Engineering and Imaging Sciences; Univ. College London (United Kingdom). Department of Medical Physics and Biomedical Engineering. CMIC. Translational Imaging Group
- Erasmus Univ. Medical Center, Rotterdam (Netherlands). Dept. of Neurology; Erasmus Univ. Medical Center, Rotterdam (Netherlands). Dept. of Radiology
- Univ. of California, San Francisco, CA (United States). Dept. of Neurology, Memory and Aging Center; Univ. of California, San Francisco, CA (United States). Dept. of Radiology and Biomedical Imaging; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Biophysics and Integrated Bioimaging Division; Univ. of California, Berkeley, CA (United States). Helen Wills Neurosciecne Inst.
- Vrije Univ., Amsterdam (Netherlands). Amsterdam Neuroscience. Dept. of Neurology. Alzheimer Center Amsterdam; Lund Univ. (Sweden). Clinical Memory Research Unit
We previously found temporoparietal-predominant atrophy patterns in the behavioral variant of Alzheimer’s disease (bvAD), with relative sparing of frontal regions. Here, we aimed to understand the clinico-anatomical dissociation in bvAD based on alternative neuroimaging markers. We retrospectively included 150 participants, including 29 bvAD, 28 “typical” amnestic-predominant AD (tAD), 28 behavioral variant of frontotemporal dementia (bvFTD), and 65 cognitively normal participants. Patients with bvAD were compared with other diagnostic groups on glucose metabolism and metabolic connectivity measured by [18F]FDG-PET, and on subcortical gray matter and white matter hyperintensity (WMH) volumes measured by MRI. A receiver-operating-characteristic-analysis was performed to determine the neuroimaging measures with highest diagnostic accuracy. bvAD and tAD showed predominant temporoparietal hypometabolism compared to controls, and did not differ in direct contrasts. However, overlaying statistical maps from contrasts between patients and controls revealed broader frontoinsular hypometabolism in bvAD than tAD, partially overlapping with bvFTD. bvAD showed greater anterior default mode network (DMN) involvement than tAD, mimicking bvFTD, and reduced connectivity of the posterior cingulate cortex with prefrontal regions. Analyses of WMH and subcortical volume showed closer resemblance of bvAD to tAD than to bvFTD, and larger amygdalar volumes in bvAD than tAD respectively. The top-3 discriminators for bvAD vs. bvFTD were FDG posterior-DMN-ratios (bvADbvFTD, area under the curve [AUC] range 0.85–0.91, all p < 0.001). The top-3 for bvAD vs. tAD were amygdalar volume (bvAD>tAD), MRI anterior-DMN-ratios (bvAD
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1816073
- Journal Information:
- Alzheimer's Research & Therapy, Vol. 12, Issue 1; ISSN 1758-9193
- Publisher:
- BioMed CentralCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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