Abstract
The correlation between hearing and cognition is well established in dementia, but not in mild cognitive impairment (MCI). Objective: The aim of the present study was to define the prevalence of hearing impairment in elderly patients with MCI and in controls. Methods: Twenty-nine patients with MCI and 24 control subjects were analyzed. We evaluated memory and hearing impairments through clinical tests, including the Mini Mental Status Examination, Clinical Dementia Rating (CDR) and Hearing Handicap Inventory for the Elderly Screening (HHIE-S). Audiometries were performed in 22 patients with MCI and 19 subjects in a control group. Results: MCI patients showed more hearing complaints (68.9%) compared to the control group (25%) (p=0.001). No differences in the intensity of hearing complaints, measured by the HHIE-S, were detected. Nonetheless, differences between mean hearing threshold (MCI group=23.4±11.3 dB and control group=16.0±10.1dB) (p=0.03) were identified. Conclusions: There is a significant association between MCI and hearing impairment. Hearing impairment in MCI patients may be a contributory factor to cognitive decline. This may however be related to the same neuropathological process, due to lesions of cortical areas related to hearing. The early diagnosis of hearing impairment in MCI patients may offer a more appropriate approach to this disease.
Key words:
dementia; memory; hearing; audiometry; elderly; aged.
Resumo
A relação entre audição e cognição está bem estabelecida em demências, porém não no comprometimento cognitivo leve (CCL). Objetivo: Propomos um estudo para determinar a prevalência de deficit auditivo em idosos portadores de CCL e controles. Métodos: Foram avaliados 29 pacientes com CCL e 24 controles. Analisamos as perdas de memória e de audição através de testes, como o Mini Exame do Estado Mental, o Escore Clínico de Demência e o HHIE-S (Hearing Handicap Inventory for the Elderly Screening). Vinte e dois pacientes com CCL e 19 controles foram submetidos a audiometrias. Resultados: O grupo CCL apresentou mais queixas auditivas (68,9%) se comparado com o controle (25%) (p=0.001). Não foram encontradas diferenças na intensidade da queixa auditiva, medida pelo HHIE-S. Foram detectadas diferenças entre a média dos limiares auditivos de pacientes com CCL (23,4±11,3 dB) e de controles (16,0±10,1 dB) (p=0,03). Conclusões: Existe significativa associação entre CCL e perdas auditivas. O deficit auditivo em pacientes com CCL pode ser um fator contribuinte para o declínio cognitivo ou estar relacionado a um mesmo processo neuropatológico, devido à lesão de áreas corticais relacionadas à audição. O diagnóstico precoce de perdas auditivas em pacientes com CCL pode permitir uma abordagem mais adequada desta doença.
Palavras-chave:
demência; memória; audição; audiometria; idosos.
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Publication Dates
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Publication in this collection
Jul-Sep 2007