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Distinct patterns of medial temporal impairment in degenerative dementia: a brain SPECT perfusion study in Alzheimer's disease and frontotemporal dementia.
- Source :
-
European journal of nuclear medicine and molecular imaging [Eur J Nucl Med Mol Imaging] 2013 Jun; Vol. 40 (6), pp. 932-42. Date of Electronic Publication: 2013 Apr 04. - Publication Year :
- 2013
-
Abstract
- Purpose: Medial temporal impairment can be detected clinically and by morphological imaging during Alzheimer's disease (AD), but the existence of a functional impairment in this area seems to be less well established. Yet such functional impairment is classically found in other degenerative cortical dementias, such as the frontal variant of frontotemporal dementia (fv-FTD). The aim of this study was to characterize and compare brain SPECT perfusion of the medial temporal lobe in AD and fv-FTD.<br />Methods: Voxel-based comparisons were performed using SPM8 between cerebral SPECT images from 85 AD patients, 25 fv-FTD patients and 12 healthy controls at the whole-brain level and the medial temporal lobe level using a region of interest approach (p < 0.001, corrected for the cluster).<br />Results: In the free and cued selective reminding test, used to evaluate medial temporal memory function, AD patients had significantly lower scores than the fv-FTD patients (p < 0.005). AD and fv-FTD patients showed hypoperfused medial temporal structures in comparison to normal controls. However, fv-FTD patients had more pronounced hypoperfusion in this area, with a different topography, more anterior and more parahippocampal.<br />Conclusion: These results show that medial temporal hypoperfusion can be detected in degenerative dementias by SPECT. Paradoxically, the hypoperfusion is more severe in fv-FTD than in AD patients, even though the mnesic profile of AD is more altered, suggesting the existence of inefficient compensatory mechanisms.
- Subjects :
- Aged
Aged, 80 and over
Alzheimer Disease diagnosis
Case-Control Studies
Female
Frontotemporal Dementia diagnosis
Hippocampus pathology
Humans
Male
Middle Aged
Perfusion
ROC Curve
Time Factors
Alzheimer Disease diagnostic imaging
Brain pathology
Dementia diagnosis
Dementia pathology
Frontotemporal Dementia diagnostic imaging
Tomography, Emission-Computed, Single-Photon
Subjects
Details
- Language :
- English
- ISSN :
- 1619-7089
- Volume :
- 40
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- European journal of nuclear medicine and molecular imaging
- Publication Type :
- Academic Journal
- Accession number :
- 23553080
- Full Text :
- https://doi.org/10.1007/s00259-013-2389-8