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Orphanet Journal of Rare Diseases
Published in: Orphanet Journal of Rare Diseases 1/2018

Open Access 01-12-2018 | Research

Distinguishing neurocognitive deficits in adult patients with NP-C from early onset Alzheimer’s dementia

Authors: Andreas Johnen, Matthias Pawlowski, Thomas Duning

Published in: Orphanet Journal of Rare Diseases | Issue 1/2018

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Abstract

Background

Niemann-Pick disease type C (NP-C) is a rare, progressive neurodegenerative disease caused by mutations in the NPC1 or the NPC2 gene. Neurocognitive deficits are common in NP-C, particularly in patients with the adolescent/adult-onset form. As a disease-specific therapy is available, it is important to distinguish clinically between the cognitive profiles in NP-C and primary dementia (e.g., early Alzheimer’s disease; eAD).

Methods

In a prospective observational study, we directly compared the neurocognitive profiles of patients with confirmed NP-C (n = 7) and eAD (n = 15). All patients underwent neurocognitive assessment using dementia screening tests (mini-mental status examination [MMSE] and frontal assessment battery [FAB]) and an extensive battery of tests assessing verbal memory, visuoconstructive abilities, visual memory, executive functions and verbal fluency.

Results

Overall cognitive impairment (MMSE) was significantly greater in eAD vs. NP-C (p = 0.010). The frequency of patients classified as cognitively ‘impaired’ was also significantly greater in eAD vs. NP-C (p = 0.025). Patients with NP-C showed relatively preserved verbal memory, but frequent impairment in visual memory, visuoconstruction, executive functions and in particular, verbal fluency. In the eAD group, a wider profile of more frequent and more severe neurocognitive deficits was seen, primarily featuring severe verbal and visual memory deficits along with major executive impairment. Delayed verbal memory recall was a particularly strong distinguishing factor between the two groups.

Conclusion

A combination of detailed yet easy-to-apply neurocognitive tests assessing verbal memory, executive functions and verbal fluency may help distinguish NP-C cases from those with primary dementia due to eAD.
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Metadata
Title
Distinguishing neurocognitive deficits in adult patients with NP-C from early onset Alzheimer’s dementia
Authors
Andreas Johnen
Matthias Pawlowski
Thomas Duning
Publication date
01-12-2018
Publisher
BioMed Central
Published in
Orphanet Journal of Rare Diseases / Issue 1/2018
Electronic ISSN: 1750-1172
DOI
https://doi.org/10.1186/s13023-018-0833-3

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