Abstract
Objectives
To investigate the volumetric alterations of hippocampal subfields and identify which subfields contribute to mild cognitive impairment (MCI) in multiple system atrophy (MSA) and Parkinson’s disease (PD).
Methods
Thirty MSA-MCI, 26 PD-MCI, and 30 healthy controls were administered cognitive assessment, along with hippocampal segmentation using FreeSurfer 6.0 after a 3-T MRI scan. Regression analyses were performed between the volumes of hippocampal subfields and cognitive variables.
Results
Compared with healthy controls, the volume of the hippocampal fissure was enlarged in PD-MCI patients, while left Cornu Ammonis (CA2–CA3), bilateral molecular layer, bilateral hippocampus–amygdala transition area, right subiculum, right CA1, right presubiculum, right parasubiculum, and bilateral whole hippocampus were reduced in the MSA-MCI group. Moreover, volumetric reductions of the bilateral hippocampal tail, bilateral CA1, bilateral presubiculum, bilateral molecular layer, left CA2–CA3, left hippocampus–amygdala transition area, right parasubiculum, and bilateral whole hippocampus were found in MSA-MCI relative to the PD-MCI group. The volumes of the left CA2–CA3 (B = − 11.34, p = 0.006) and left parasubiculum (B = 4.63, p = 0.01) were respectively correlated with language and abstraction functions. The volumes of the left fimbria (B = 6.99, p = 0.002) and left hippocampus–amygdala transition area (B = 2.28, p = 0.009) were correlated with visuospatial/executive function.
Conclusions
The MSA-MCI patients showed more widespread impairment of hippocampal subfields compared with the PD-MCI group, involving trisynaptic loop and amygdala–hippocampus interactions. The alteration of CA, hippocampus–amygdala transition area, and fimbria still requires further comparison between the two patient groups.
Key Points
• The atrophy patterns of hippocampal subfields differed between MSA and PD patients.
• MSA has widespread change in trisynaptic loop and amygdala–hippocampus interactions.
• The atrophy patterns may help to understand the differences of cognitive impairment in MSA and PD.
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Abbreviations
- CA:
-
Cornu Ammonis
- H-Y:
-
Hoehn and Yahr
- HC:
-
Healthy controls
- MCI:
-
Mild cognitive impairment
- MMSE:
-
Mini-Mental State Examination
- MoCA:
-
Montreal Cognitive Assessment
- MPRAGE:
-
Magnetization-prepared rapid acquisition gradient echo
- MSA-MCI:
-
MSA patients with MCI
- MSA:
-
Multiple system atrophy
- PD-MCI:
-
PD patients with MCI
- PD-NCI:
-
PD patients with no CI
- PD:
-
Parkinson’s disease
- PDD:
-
Parkinson’s disease dementia
- UPDRS-III:
-
The Unified Parkinson’s Disease Rating Scale
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The scientific guarantor of this publication is Dr. GuoGuang Fan.
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Dr. XiaoGuang Luo kindly provided statistical advice for this manuscript.
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Wang, N., Zhang, L., Yang, H. et al. Do multiple system atrophy and Parkinson’s disease show distinct patterns of volumetric alterations across hippocampal subfields? An exploratory study. Eur Radiol 29, 4948–4956 (2019). https://doi.org/10.1007/s00330-019-06043-9
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DOI: https://doi.org/10.1007/s00330-019-06043-9