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Articles by Yolande A.L. Pijnenburg
Total Records ( 2 ) for Yolande A.L. Pijnenburg
  Sietske A.M. Sikkes , Elly S.M. de Lange-de Klerk , Yolande A.L. Pijnenburg , Freek Gillissen , Rolinka Romkes , Dirk L. Knol , Bernard M.J. Uitdehaag and Philip Scheltens
  Background Interference in everyday functioning is part of the diagnostic criteria for dementia. Questionnaires measuring ”instrumental activities of daily living“ (IADL) are used to measure this interference, but the psychometric quality of these questionnaires is often questioned. In addition, these questionnaires are less suited for early-onset patients. This is problematic, given the high frequency of relatively young patients in memory clinics. In this article, we describe the development and psychometric properties of a new informant-based IADL questionnaire aimed at detecting incipient dementia and appropriate for a broad age range. Methods We defined IADL in consensus with experts and constructed items based on existing items and suggestions from experts and informants. Informants of subjects (n = 206) who visited the Alzheimer Center of the VU University Medical Center completed the questionnaire. Factor structure was investigated using classical exploratory factor analysis and item response theory. We assessed test–retest reliability in 73 informants using weighted κ values. Results The questionnaire consisted of 75 items and was computerized to enhance ease of administration. Exploratory factor analysis supported a single-factor model, with 48.3% of the variance being explained by the first factor. We removed five items, as they did not fit the model. High internal consistency was demonstrated. Test–retest reliability showed that the majority of items (87.9%) had substantial-to-almost perfect κ values. Conclusion The Amsterdam IADL Questionnaire (Amsterdam IADL questionnaire is a registered trademark of Alzheimer Center VU University Medical Center, Amsterdam, The Netherlands) is a 70-item informant-based computerized questionnaire aimed at detecting early dementia and early-onset dementia. Initial results show that this questionnaire is a promising new tool.
  Esther L.G.E. Koedam , Annelies E. van der Vlies , Wiesje M. van der Flier , Nicolaas A. Verwey , Ted Koene , Philip Scheltens , Marinus A. Blankenstein and Yolande A.L. Pijnenburg
  Objective In this study we investigated the relationships between cerebrospinal fluid (CSF) biomarkers (tau and amyloid-β1-42 [Aβ1-42]) and cognition or behavior in patients with frontotemporal dementia (the behavioral variant, bvFTD). Methods We included 58 patients with bvFTD. All patients underwent a neuropsychological assessment and lumbar puncture. Relationships between CSF biomarkers and cognition or behavior were assessed with linear regression analysis. Results After correction for age, sex, and education, CSF tau levels were found to be negatively related to the Visual Association Test (standardized β = −0.3, P < .05), whereas CSF Aβ1-42 levels were found to be positively related to the Mini-Mental State Examination (β = 0.3, P < .05), the frontal assessment battery (β = 0.5, P < .05), and digit span backwards test (β = 0.3, P = .01). We did not find relations between CSF biomarkers and behavior (measured by the neuropsychiatric inventory). After excluding all patients with a CSF biomarker profile often seen in Alzheimer‘s disease (high levels of tau and low levels of Aβ1-42), we still found relations between CSF Aβ1-42 levels and Visual Association Test object naming (β = 0.4, P < .05), as well as between CSF Aβ1-42 levels and the frontal assessment battery (β = 0.5, P < .05, but there was no relation between CSF tau and cognition. Conclusion Low CSF Aβ1-42 levels are associated with worse general cognitive function and worse executive function in patients with bvFTD. Our results provide circumstantial evidence for a pathophysiological role of Aβ1-42 in bvFTD.
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