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Neuropsychological differences between frontotemporal lobar degeneration and Alzheimer's disease

Diferenças neuropsicológicas entre degeneração lobar frontotemporal e doença de Alzheimer

Abstract

Memory impairment is the main clinical feature in Alzheimer disease (AD), whereas in frontotemporal lobar degeneration (FTLD) behavioral and language disorders predominate.

Objectives:

To investigate possible differences between the neuropsychological performance in FTLD and AD.

Methods:

Fifty-six AD patients (mean age=72.98±7.43; mean schooling=9.62±4.68; 35 women and 21 men), 17 FTLD patients (mean age=67.64±7.93; mean schooling=12.12±4.77; 9 women and 8 men), and 60 controls (mean age=68.90±7.48; mean schooling=10.72±4.74; 42 women and 18 men) were submitted to a Dementia Rating Scale (DRS) and a comprehensive neuropsychological evaluation composed of tasks assessing attention, visuoperceptual abilities, constructive abilities, executive functions, memory and language.

Results:

DRS total score and subscales were not able to differentiate FTLD from AD patients. However, FTLD and AD patients showed statistically significant differences in performance in tests of verbal (Logical Memory, Rey Auditory Verbal Learning Test) and visual (Visual Reproduction, recall of the Rey Complex Figure) episodic memory, verbal immediate memory (Logical Memory), attention with interference (Trail Making Test - Part B), verbal fluency (semantic and phonemic) and concept formation (WCST).

Conclusion:

Contrary to expectations, only a few tasks executive function tasks (Trail Making Test - Part B, F.A.S. and WCST) and two memory tests (verbal and visual episodic memory tests) were able to differentiate between FTLD and AD patients.

Key words:
neuropsychological assessment; memory; executive functions; Alzheimer disease; frontotemporal lobar degeneration.

Resumo

Comprometimento de memória é a principal característica clínica na doença de Alzheimer (DA), enquanto na degeneração lobar fronto-temporal (DLFT) alterações de linguagem e comportamentais são predominantes.

Objetivos:

Investigar possíveis diferenças entre o desempenho neuropsicológico de pacientes com DLFT e pacientes com DA.

Métodos:

56 pacientes com DA (média de idade=72,98±7,43; média de escolaridade=9,62±4,68; 35 mulheres e 21 homens), 17 pacientes com DLFT (média de idade=67,64±7,93; média de escolaridade=12,12±4,77; 9 mulheres e 8 homens) e 60 controles (média de idade=68,90±7,48; média de escolaridade=10,72±4,74; 42 mulheres e 18 homens) foram submetidos à Escala de Avaliação de Demência (Dementia Rating Scale - DRS) e à extensa avaliação neuropsicológica composta de tarefas que examinam atenção, habilidades visuais-perceptuais, habilidades construtivas, funções executivas, memória e linguagem.

Resultados:

O escore total e as subescalas da DRS não foram capazes de diferenciar pacientes com DA de DLFT. Pacientes com DLFT e DA demonstraram diferenças estatisticamente significativa em testes de memória episódica verbal (Memória Lógica, Teste de Aprendizagem Verbal Auditiva de Rey) e visual (Reprodução Visual e evocação da Figura Complexa de Rey), memória imediata verbal (Memória Lógica), atenção com interferência (Trail Making Test - Parte B) e fluência verbal (semântica e fonêmica).

Conclusão:

Ao contrário do esperado, somente algumas tarefas de função executiva (Trail Making Test - Parte B, F.A.S. e WCST) e dois testes de memória (testes de memória episódica verbal e visual) foram capazes de diferenciar pacientes com DLFT de pacientes com DA.

Palavras-chave:
avaliação neuropsicológica; memória; funções executivas; doença de Alzheimer; degeneração lobar frontotemporal.

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Publication Dates

  • Publication in this collection
    Jul-Sep 2008

History

  • Received
    07 July 2008
  • Accepted
    20 Aug 2008
Academia Brasileira de Neurologia, Departamento de Neurologia Cognitiva e Envelhecimento R. Vergueiro, 1353 sl.1404 - Ed. Top Towers Offices, Torre Norte, São Paulo, SP, Brazil, CEP 04101-000, Tel.: +55 11 5084-9463 | +55 11 5083-3876 - São Paulo - SP - Brazil
E-mail: revistadementia@abneuro.org.br | demneuropsy@uol.com.br