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Patterns of cerebral hypoperfusion in amnestic and dysexecutive MCI
Linda L Chao1, Judy Pa, Audrey Duarte
1Center for Imaging of Neurodegenerative Diseases, San Francisco VA Medical Center, 4150 Clement Street, San Francisco, CA 94121, USA. linda.chao@ucsf.edu
Abstract:
Although early studies on mild cognitive impairment (MCI) focused on memory dysfunction; more recent studies suggest that MCI is clinically heterogeneous. The objective of this study is to examine patterns of cerebral perfusion in anmestic (N=12) and nonamnestic (N=12) single-domain MCI patients from 4 a priori regions of interest: middle and superior frontal cortex, posterior cingulate, and precuneus, to compare them relative to healthy controls (N=12), and to correlate perfusion with neuropsychologic measures. Relative to controls, all MCI patients had hypoperfusion in the posterior cingulate, bilaterally. MCI patients with executive dysfunctions also showed hypoperfusion in bilateral middle frontal cortex and the left precuneus relative to controls and in the left middle frontal cortex, left posterior cingulate, and left precuneus relative to amnestic MCI patients. Perfusion in the posterior cingulate correlated positively with memory performance whereas perfusion in all 4 a priori regions of interest, predominantly on the left side, correlated with executive function performance. The finding that single-domain MCI patients with prominent deficits in different cognitive domains exhibited different patterns of hypoperfusion relative to controls supports the existence of distinct subgroups of MCI. These data further suggest that cognitive impairment in MCI is related to cerebral hypoperfusion.
Insights
Mild cognitive impairment (MCI) is heterogeneous. Distinct cerebral hypoperfusion patterns in amnestic and nonamnestic MCI patients suggest different subgroups, linking cognitive decline to reduced brain blood flow.
Area of Science:
- Neuroscience
- Neurology
- Medical Imaging
Background:
- Mild cognitive impairment (MCI) is increasingly recognized as clinically heterogeneous, extending beyond initial memory dysfunction.
- Understanding distinct MCI subtypes is crucial for accurate diagnosis and targeted interventions.
Purpose of the Study:
- To investigate cerebral perfusion patterns in amnestic and nonamnestic single-domain MCI patients.
- To compare these patterns with healthy controls.
- To correlate cerebral perfusion with neuropsychological measures.
Main Methods:
- Utilized single-photon emission computed tomography (SPECT) or similar neuroimaging technique to assess cerebral blood flow.
- Focused analysis on four key brain regions: middle frontal cortex, superior frontal cortex, posterior cingulate, and precuneus.
- Compared perfusion in 12 amnestic MCI, 12 nonamnestic MCI, and 12 healthy control participants.
Main Results:
- All MCI patients exhibited bilateral hypoperfusion in the posterior cingulate compared to controls.
- MCI patients with executive dysfunction showed additional hypoperfusion in the bilateral middle frontal cortex and left precuneus.
- Posterior cingulate perfusion correlated positively with memory, while perfusion in all studied regions correlated with executive function.
Conclusions:
- Distinct patterns of cerebral hypoperfusion in single-domain MCI subtypes support the existence of clinically heterogeneous groups.
- Cognitive impairments in MCI are associated with specific regional cerebral hypoperfusion.
- Neuroimaging of cerebral perfusion may aid in differentiating MCI subtypes and understanding disease mechanisms.
