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Rehabilitation in semantic dementia: Study of the effectiveness of lexical reacquisition in three patients

Reabilitação na demência semântica: estudo da eficácia da reaquisição lexical em três pacientes

Abstract

Although language rehabilitation in patients with primary progressive aphasia (PPA) is recommended, rehabilitation studies in this clinical syndrome are scarce. Specifically, in relation to semantic dementia (SD), few studies have shown the possibility of lexical relearning. Objective: To analyze the effectiveness of rehabilitation for lexical reacquisition in SD. Methods: Three SD patients were submitted to training for lexical reacquisition based on principles of errorless learning. Comparisons between naming performance of treated items (pre and post-training) and non-treated items of the Boston Naming Test (BNT) were made. Results: All patients improved their performance in naming treated words after intervention. However, decline in performance in naming of non-treated items was observed. Case 1 named zero items at baseline while her performance post-training was 29.4% correct responses without cueing, and 90.7% correct with and without cueing. Case 2 named 6.9% of items correctly at baseline and his performance in post-training was 52.9% without cueing and 87.3%, with and without cueing. Case 3 named zero items at baseline and his performance in post-training was 100% correct responses without cueing. Considering the performance in naming the non-treated items of the BNT, the percentages of correct responses in the first evaluation and in the re-evaluation, respectively were: 16.7% and 8.3% (case 1; 14 month-interval); 26.7% and 11.6% (case 2; 18 month-interval) and 11.6% and 8.3% (case 3; 6 month-interval). Conclusions: The reacquisition of lost vocabulary may be possible in SD despite progressive semantic deterioration.

Key words:
semantic dementia, semantic memory, primary progressive aphasia, rehabilitation; lexical reacquisition

Resumo

Apesar de recomendada reabilitação da linguagem na afasia progressiva primária (APP), há poucos estudos sobre reabilitação nesta síndrome. Especificamente, quanto à demência semântica (DS), os poucos estudos têm mostrado possibilidade de reaprendizado lexical. Objetivo: Analisar a eficácia da reabilitação para reaquisição lexical na DS. Métodos: Três pacientes com DS foram submetidos à reabilitação para reaquisição lexical baseada nos princípios do aprendizado sem erro. Comparações entre desempenhos na nomeação de itens treinados (pré e pós-tratamento) e de itens não-treinados do Teste de Nomeação de Boston (TNB) foram realizadas. Resultados: Os pacientes obtiveram melhor desempenho na nomeação das palavras treinadas após intervenção. Por outro lado, houve declínio no desempenho dos itens não-treinados. O caso 1 não nomeou nenhum item na linha de base (pré-tratamento) e seu desempenho após o tratamento foi de 29,4% de acertos sem pistas e 90,7% com e sem pistas. O caso 2 nomeou corretamente 6,9% na linha de base e sua performance, pós-treinamento, foi de 52,9% sem pistas e 87,3%, com e sem pistas. O caso 3 não nomeou nenhum item na linha de base e após o treinamento nomeou 100% dos itens sem pista. Considerando a nomeação dos itens lexicais não-treinados do TNB, as porcentagens de acertos na primeira e segunda avaliações foram respectivamente: 16,7% e 8,3% (caso 1; 14 meses de intervalo); 26,7% e 11,6% (caso 2; 18 meses de intervalo) e 11,6% e 8,3% (caso 3; 6 meses de intervalo). Conclusões: A reaquisição do vocabulário perdido pode ser possível na DS apesar da progressiva deterioração semântica.

Palavras-chave:
demência semântica; memória semântica; afasia progressiva primária; reabilitação; reaquisição lexical

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Publication Dates

  • Publication in this collection
    Oct-Dec 2010

History

  • Received
    10 Mar 2010
  • Accepted
    11 Aug 2010
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
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