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94 Associations Between African Neuropsychological Tests of Memory and Medial Temporal Lobe Structures in Older Congolese Adults with Suspected Dementia

Published online by Cambridge University Press:  21 December 2023

Jean Ikanga
Affiliation:
Department of Rehabilitation Medicine, Emory University School of Medicine, Atlanta, GA, USA. Department of Psychiatry, University of Kinshasa and Catholic University of Congo, Kinshasa, the Democratic Republic of the Congo.
Sabrina D. Hickle*
Affiliation:
Department of Rehabilitation Medicine, Emory University School of Medicine, Atlanta, GA, USA.
Megan Schwinne
Affiliation:
Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA, USA.
Emmanuel Epenge
Affiliation:
Department of Neurology, University of Kinshasa, Kinshasa, the Democratic Republic of the Congo.
Guy Gikelekele
Affiliation:
Department of Psychiatry, University of Kinshasa and Catholic University of Congo, Kinshasa, the Democratic Republic of the Congo.
Immaculee Kavugho
Affiliation:
Memory Clinic of Kinshasa, Kinshasa, the Democratic Republic of the Congo.
Nathan Tshengele
Affiliation:
Department of Psychiatry, University of Kinshasa and Catholic University of Congo, Kinshasa, the Democratic Republic of the Congo.
Mampunza Samuel
Affiliation:
Department of Psychiatry, University of Kinshasa and Catholic University of Congo, Kinshasa, the Democratic Republic of the Congo.
Liping Zhao
Affiliation:
Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, GA, USA.
Deqiang Qiu
Affiliation:
Department of Radiology and Imaging Sciences & Department of Biomedical Engineering, Emory University, School of Medicine, Atlanta, GA, USA.
Anthony Stringer
Affiliation:
Department of Rehabilitation Medicine, Emory University School of Medicine, Atlanta, GA, USA.
Amit M. Saindane
Affiliation:
Department of Radiology and Imaging Sciences and Neurosurgery, Emory University, School of Medicine, Atlanta, GA, USA.
Alvaro Alonso
Affiliation:
Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA, USA.
Daniel L. Drane
Affiliation:
Department of Neurology and Pediatrics, Emory University, School of Medicine, Atlanta, GA, USA
*
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Abstract

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Objective:

Hippocampal and medial temporal lobe structure atrophy is commonly observed in patients with mild neurocognitive disorders and dementias of various neurodegenerative conditions, with the degree of atrophy in these regions correlating with cognitive performance on memory tasks. This research has been conducted largely in western and educated countries. As cognitive aging, risk factors, clinical course, and neuropathology can differ between individuals of different races and ethnicities, our goal is to determine whether these findings also generalize to patients with suspected dementias living in the Democratic Republic of the Congo (DRC).

Participants and Methods:

Neuroimaging and cognitive data have been collected on 40 subjects with probable dementia from the DRC and 40 age-, education-, and gender-matched controls. Patients were classified into groups based on scores on the Community Screening Instrument and the Alzheimer's Questionnaire. All participants completed the African Neuropsychological Battery. T1 MPRAGE images were acquired on Siemens 1.5T scanner. Freesurfer was used to derive volumes and cortical thickness of medial temporal lobe regions. Volumes of structures were divided by intracranial vault volumes to adjust for head size. T-tests were used to compare hippocampal volumes, entorhinal cortex thickness, and perirhinal cortex thickness between subjects with probable dementia compared to healthy age-, gender-, and education-matched controls. Bivariate correlations were conducted to determine whether the volumes of these structures correlate significantly with learning and memory measures on the ANB.

Results:

Results will be determined by the methods described previously.

Conclusions:

Results from this study will demonstrate whether structural brain changes commonly seen in individuals with dementia living in western and educated countries also are observed in the DRC. Results will also demonstrate whether these brain changes coincide with the degree of impairments on tasks of memory, and whether these structures can be used to aid in clinical diagnosis of patients with dementia and support the use of the ANB and neuroimaging in clinical detection of dementias in the DRC.

Type
Poster Session 03: Dementia | Amnesia | Memory | Language | Executive Functions
Copyright
Copyright © INS. Published by Cambridge University Press, 2023