Abstract
Objective: The aim of our study was to examine the relationship between corticostriatal Aβ- amyloid deposition and cognitive dysfunction in a cohort of patients with Parkinson disease (PD) at risk for dementia. Methods: This was a cross-sectional study of 40 patients with PD with mild cognitive impairment (MCI) or other known dementia risk factors. Subjects underwent dynamic Aβ-amyloid and vesicular monoamine transporter 2 PET imaging using [11C] Pittsburgh compound B (PiB) and [11C] dihydrotetrabenazine (DTBZ), respectively, and neuropsychological assessment. PiB and DTBZ PET data were analyzed using the Logan graphical method to determine cerebral PiB deposition relative to the cerebellar hemispheres and striatal DTBZ binding relative to occipital neocortex. Component z scores were calculated for individual cognitive domains (memory, visuospatial processing, working memory/attention, and executive function) and combined linearly for global estimation of cognition. Correlation of cognitive function and cortical PiB binding was investigated. Results: Elevated cerebral PiB binding at levels seen in patients with AD was infrequent (6 of 40 subjects). Mean cortical PiB binding in the entire cohort was 1.16 ± 0.16 (distribution volume ratio; range 0.96-1.78). A significant correlation was noted between cortical PiB binding and global composite cognitive function (r=-0.55, p <0.005) as well as the Wechsler Adult Intelligence Scale score (r=-0.54, p = 0.0004). Conclusion: Elevated cerebral A-amyloid deposition at levels seen in Alzheimer disease is uncommon in subjects with PD at risk for dementia. In our sample, the prevalence of markedly elevated PiB binding was significantly lower than that found in prior studies of cognitively normal elderly individuals. Neocortical PiB binding correlated robustly with measures of cognitive impairment in our cohort.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1161-1167 |
| Number of pages | 7 |
| Journal | Neurology |
| Volume | 79 |
| Issue number | 11 |
| DOIs | |
| State | Published - Sep 11 2012 |
Fingerprint
ASJC Scopus subject areas
- Clinical Neurology
- Arts and Humanities (miscellaneous)
Cite this
Aβ-Amyloid deposition in patients with parkinson disease at risk for development of dementia. / Petrou, Myria; Bohnen, Nicolaas I.; Müller, Martijn L T M; Koeppe, Robert A.; Albin, Roger L.; Frey, Kirk A.
In: Neurology, Vol. 79, No. 11, 11.09.2012, p. 1161-1167.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Aβ-Amyloid deposition in patients with parkinson disease at risk for development of dementia
AU - Petrou, Myria
AU - Bohnen, Nicolaas I.
AU - Müller, Martijn L T M
AU - Koeppe, Robert A.
AU - Albin, Roger L.
AU - Frey, Kirk A.
PY - 2012/9/11
Y1 - 2012/9/11
N2 - Objective: The aim of our study was to examine the relationship between corticostriatal Aβ- amyloid deposition and cognitive dysfunction in a cohort of patients with Parkinson disease (PD) at risk for dementia. Methods: This was a cross-sectional study of 40 patients with PD with mild cognitive impairment (MCI) or other known dementia risk factors. Subjects underwent dynamic Aβ-amyloid and vesicular monoamine transporter 2 PET imaging using [11C] Pittsburgh compound B (PiB) and [11C] dihydrotetrabenazine (DTBZ), respectively, and neuropsychological assessment. PiB and DTBZ PET data were analyzed using the Logan graphical method to determine cerebral PiB deposition relative to the cerebellar hemispheres and striatal DTBZ binding relative to occipital neocortex. Component z scores were calculated for individual cognitive domains (memory, visuospatial processing, working memory/attention, and executive function) and combined linearly for global estimation of cognition. Correlation of cognitive function and cortical PiB binding was investigated. Results: Elevated cerebral PiB binding at levels seen in patients with AD was infrequent (6 of 40 subjects). Mean cortical PiB binding in the entire cohort was 1.16 ± 0.16 (distribution volume ratio; range 0.96-1.78). A significant correlation was noted between cortical PiB binding and global composite cognitive function (r=-0.55, p <0.005) as well as the Wechsler Adult Intelligence Scale score (r=-0.54, p = 0.0004). Conclusion: Elevated cerebral A-amyloid deposition at levels seen in Alzheimer disease is uncommon in subjects with PD at risk for dementia. In our sample, the prevalence of markedly elevated PiB binding was significantly lower than that found in prior studies of cognitively normal elderly individuals. Neocortical PiB binding correlated robustly with measures of cognitive impairment in our cohort.
AB - Objective: The aim of our study was to examine the relationship between corticostriatal Aβ- amyloid deposition and cognitive dysfunction in a cohort of patients with Parkinson disease (PD) at risk for dementia. Methods: This was a cross-sectional study of 40 patients with PD with mild cognitive impairment (MCI) or other known dementia risk factors. Subjects underwent dynamic Aβ-amyloid and vesicular monoamine transporter 2 PET imaging using [11C] Pittsburgh compound B (PiB) and [11C] dihydrotetrabenazine (DTBZ), respectively, and neuropsychological assessment. PiB and DTBZ PET data were analyzed using the Logan graphical method to determine cerebral PiB deposition relative to the cerebellar hemispheres and striatal DTBZ binding relative to occipital neocortex. Component z scores were calculated for individual cognitive domains (memory, visuospatial processing, working memory/attention, and executive function) and combined linearly for global estimation of cognition. Correlation of cognitive function and cortical PiB binding was investigated. Results: Elevated cerebral PiB binding at levels seen in patients with AD was infrequent (6 of 40 subjects). Mean cortical PiB binding in the entire cohort was 1.16 ± 0.16 (distribution volume ratio; range 0.96-1.78). A significant correlation was noted between cortical PiB binding and global composite cognitive function (r=-0.55, p <0.005) as well as the Wechsler Adult Intelligence Scale score (r=-0.54, p = 0.0004). Conclusion: Elevated cerebral A-amyloid deposition at levels seen in Alzheimer disease is uncommon in subjects with PD at risk for dementia. In our sample, the prevalence of markedly elevated PiB binding was significantly lower than that found in prior studies of cognitively normal elderly individuals. Neocortical PiB binding correlated robustly with measures of cognitive impairment in our cohort.
UR - http://www.scopus.com/inward/record.url?scp=84867510729&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84867510729&partnerID=8YFLogxK
U2 - 10.1212/WNL.0b013e3182698d4a
DO - 10.1212/WNL.0b013e3182698d4a
M3 - Article
VL - 79
SP - 1161
EP - 1167
JO - Neurology
JF - Neurology
SN - 0028-3878
IS - 11
ER -