An Informant-Based Simple Questionnaire for Language Assessment in Neurodegenerative Disorders.

BACKGROUND/AIMS: Language dysfunction is a crucial feature of brain disorders. This study investigated language dysfunction in patients with dementia with or without parkinsonism by using an informant-based simple questionnaire.

METHODS: Language dysfunction in normal controls (NCs), and patients with Parkinson disease (PD), Parkinson disease dementia (PDD), dementia with Lewy bodies (DLB), or Alzheimer disease (AD) were analyzed and compared.

RESULTS: A total of 1,662 individuals were studied: 285 NCs, 157 PD patients, 161 PDD patients, 248 DLB patients, and 811 AD patients. Patients with PD displayed higher frequency of language dysfunction in several language domains than NC. Patients with PDD and DLB showed higher frequency of language dysfunction in most of the language domains than those with AD. A composite score of our simple questionnaire was comparable with the score for the language domain of the Cognitive Abilities Screening Instrument (CASI) in different stages of dementia due to Lewy body diseases or not.

CONCLUSION: Our study showed that the informant-based simple questionnaire is a practical screening tool and is comparable with the language subscale of CASI. This tool can be applied in clinical practice and in the registration platform for rapid language dysfunction screening.