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DOI: 10.1055/s-0043-1763486
Elderly people with human T-cell leukemia virus type 1-associated myelopathy present an early impairment in cognitive skills
Idosos com mielopatia associada ao vírus da leucemia de células T humanas tipo 1apresentam comprometimento precoce em habilidades cognitivasAbstract
Background Cerebral changes occur in individuals with human T-cell leukemia virus type 1 (HTLV-1)-associated myelopathy (HAM) and seem to predominate in subcortical areas. Little is known about the cognitive decline in the elderly living with HTLV-1.
Objective To evaluate the cognitive aging of individuals infected with HTLV-1 aged ≥ 50 years.
Methods This is a cross-sectional study of former blood donors infected with HTLV-1 who have been followed in the cohort of the Interdisciplinary Research Group on HTLV-1 since 1997. The groups of study consisted of 79 HTLV-1 infected individuals aged ≥ 50 years, with 41 of them presenting symptomatic HAM and 38 being asymptomatic carriers, and 59 seronegative individuals (controls) aged ≥ 60 years. All were submitted to the P300 electrophysiological test and neuropsychological tests.
Results Individuals with HAM presented delayed P300 latency in relation to the other groups, and this latency delay increased progressively with aging. The performance of this group in the neuropsychological tests was also the worst. The HTLV-1- asymptomatic group performance was similar to that of the control group.
Conclusions Individuals with HAM presented cognitive decline that progressed with aging and, although HTLV-1-asymptomatic carriers appear to present cognitive aging similar to that of healthy elderly people, concern about a subclinical cognitive impairment is warranted in this population.
Resumo
Antecedentes Alterações cerebrais ocorrem em indivíduos com mielopatia associada ao vírus da leucemia de células T humanas tipo 1 (HTLV-1) (HAM) e parecem predominar em áreas subcorticais. Pouco se sabe sobre o declínio cognitivo em idosos vivendo com HTLV-1.
Objetivo Avaliar o envelhecimento cognitivo de indivíduos infectados pelo HTLV-1 com idade ≥ 50 anos.
Métodos Trata-se de um estudo transversal com ex-doadores de sangue infectados pelo HTLV-1 acompanhados na coorte do Grupo Interdisciplinar de Pesquisa em HTLV-1 há 20 anos. Os grupos de estudo foram compostos por 79 indivíduos infectados pelo HTLV-1 com idade ≥ 50 anos, sendo que 41 apresentavam HAM e 38 eram portadores assintomáticos, e 59 indivíduos soronegativos (controles) com idade ≥ 60 anos. Todos foram submetidos ao teste eletrofisiológico P300 e testes neuropsicológicos.
Resultados Indivíduos com HAM apresentaram atraso na latência do P300 em relação aos demais grupos, e esse atraso de latência aumentou progressivamente com o envelhecimento. O desempenho desse grupo nos testes neuropsicológicos também foi o pior. O desempenho do grupo HTLV-1- assintomático foi semelhante ao do grupo controle.
Conclusão Indivíduos com HAM apresentaram declínio cognitivo que progrediu com o envelhecimento e, embora os portadores assintomáticos do HTLV-1 pareçam apresentar envelhecimento cognitivo semelhante ao dos idosos saudáveis, justifica-se a preocupação com um comprometimento cognitivo subclínico nessa população.
Keywords
Aged - Human T-lymphotropic Virus 1 - Paraparesis, Tropical Spastic - Event-Related Potentials, P300 - Neuropsychological Tests - CognitionPalavras-chave
Idoso - Vírus Linfotrópico T Tipo 1 Humano - Paraparesia Espástica Tropical - Potenciais Evocados P300 - Testes Neuropsicológicos - CogniçãoAuthors' Contributions
BRMS: responsible for data curation, formal analysis, methodology, validation, visualization, writing, and approval of the final version to be published; LL: responsible for conceptualization, data curation, formal analysis, investigation, methodology, resources, supervision, writing, and approval of the final version to be published; MLD, NCBR: responsible for data curation, methodology, validation, visualization, writing, and approval of the final version to be published; DUG: responsible for conceptualization, formal analysis, funding acquisition, investigation, methodology, project administration, resources, supervision, validation, visualization, writing, and approval of the final version to be published.
Support
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq).
Publication History
Received: 17 August 2022
Accepted: 03 November 2022
Article published online:
14 April 2023
© 2023. Academia Brasileira de Neurologia. This is an open access article published by Thieme under the terms of the Creative Commons Attribution 4.0 International License, permitting copying and reproduction so long as the original work is given appropriate credit (https://creativecommons.org/licenses/by/4.0/)
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