Publications by authors named "Uitdehaag B"

Aim: The REbif FLEXible dosing in early MS (REFLEX) study compared several brain MRI outcomes in patients presenting with clinically isolated syndromes suggestive of multiple sclerosis and treated with two dose-frequencies of subcutaneous interferon (IFN) β-1a or placebo.

Methods: Patients were randomised (1:1:1) to IFN β-1a, 44 µg subcutaneously three times a week or once a week, or placebo three times a week for up to 24 months. MRI scans were performed every 3 months, or every 6 months if the patient developed clinically definite multiple sclerosis.

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Previous studies showed that advanced neuroimaging measures (functional MRI, diffusion tensor imaging) could distinguish multiple sclerosis (MS) patients with and without cognitive impairment. Are these measures indeed better indicators for cognitive impairment or subjective cognitive complaints than conventional MRI? Fifty MS patients and 29 controls were investigated. Regression analysis, including socio-demographic data, disease characteristics, psychological measures, and (advanced) neuroimaging, showed that worse cognitive performance was associated with male sex, lower education, and lower gray matter volume.

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Following tumor resection, the majority of high-grade glioma (HGG) patients are treated with a combined modality regimen of radiotherapy and temozolomide. As a result of the tumor itself or as treatment-related neurotoxic side-effects, these patients may experience cognitive deficits. Additionally, radiological abnormalities expressed as white matter hyperintensities (WMH) and cerebral atrophy (CA) can develop.

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Background: Measuring impairments in "instrumental activities of daily living" (IADL) is important in dementia, but challenging due to the lack of reliable and valid instruments. We recently developed the Amsterdam Instrumental Activities of Daily Living Questionnaire (A-IADL-Q; note 1). We aim to investigate the diagnostic accuracy of the A-IADL-Q for dementia in a memory clinic setting.

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The application of spectral domain optical coherence tomography as a surrogate for neurodegeneration in a range of neurological disorders demands better understanding of the physiological variation of retinal layer thicknesses, which may mask any value of this emerging outcome measure. A prospective study compared retinal layer thicknesses between control subjects (n = 15) and runners (n = 27) participating in a 10-km charity run. Three scans were performed using an eye-tracking function (EBF) and automated scan registration for optimal precision at (1) baseline, (2) directly after the run, and (3) following a rehydration period.

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Background And Objectives: The Symbol Digit Modalities Test (SDMT) shows advantages over the Paced Auditory Serial Addition Test (PASAT) as a cognitive test in patients with multiple sclerosis (MS). To determine which of these tests is most valid and reliable over time as an indicator of the cognitive state of MS patients, long-term test results of both tests were compared in relation to scores of the Brief Repeatable Battery of Neuropsychological tests (BRBN).

Methods: For 485 MS patients visiting the VU University Medical Center Amsterdam for different research projects, a total number of 1078 visits with BRBN (including PASAT and SDMT) was planned.

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Background: Proxy respondents, partners of multiple sclerosis (MS) patients, can provide valuable information on the MS patients' disease. In an earlier publication we found relatively good agreement on patient reported outcomes (PROs) measuring physical impact and functioning, but we found large differences on (neuro)psychological scales.

Objective: We aim to identify patient and proxy related variables explaining differences between patients' and proxies' ratings on five PROs.

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The use of natalizumab in multiple sclerosis has been restricted by the risk of progressive multifocal leukoencephalopathy (PML). JC virus carriership, duration of natalizumab treatment and past immunosuppression are known risk factors. This has allowed for calculated risk assessment for individual patients to be implemented.

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The hypothalamus-pituitary-adrenal (HPA) axis is activated in most, but not all multiple sclerosis (MS) patients and is implicated in disease progression and comorbid mood disorders. In this post-mortem study, we investigated how HPA axis activity in MS is related to disease severity, neurodegeneration, depression, lesion pathology and gene expression in normal-appearing white matter (NAWM). In 42 MS patients, HPA axis activity was determined by measuring cortisol in cerebrospinal fluid (CSF) and counting hypothalamic corticotropin-releasing hormone (CRH)-expressing neurons.

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Background: This study describes the validation of a new instrument measuring instrumental activities of daily living (IADL), the Amsterdam IADL Questionnaire© (a registered copyright of the Alzheimer Center of the VU University Medical Center). This informant-based tool aimed at detecting IADL problems in incipient dementia was previously found to have a high internal consistency and test-retest reliability.

Methods: Patients and their informants who visited the Alzheimer Center of the VU University Medical Center were included in this study.

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Background: Visual hallucinations (VH) in Parkinson's disease (PD) are associated with PD dementia and have been related to cognitive impairments in non-demented PD patients. Reports on the specific cognitive domains affected are conflicting. The aim of the present study was to investigate the presence of specific cognitive impairments in non-demented PD patients with VH, compared to those without VH.

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Health-related quality of life (HRQOL) is a multidimensional concept used to measure patients' functioning and well-being. In recent decades, HRQOL has become an important (secondary) outcome measure in clinical trials for brain tumor patients. It could be questioned, however, whether HRQOL is the only useful outcome measure for assessing the level of functioning and well-being of these patients.

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Objective: To determine whether brain atrophy and lesion volumes predict subsequent 10 year clinical evolution in multiple sclerosis (MS).

Design: From eight MAGNIMS (MAGNetic resonance Imaging in MS) centres, we retrospectively included 261 MS patients with MR imaging at baseline and after 1-2 years, and Expanded Disability Status Scale (EDSS) scoring at baseline and after 10 years. Annualised whole brain atrophy, central brain atrophy rates and T2 lesion volumes were calculated.

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Objective: To investigate whether extent and severity of white matter (WM) damage, as measured with diffusion tensor imaging (DTI), can distinguish cognitively preserved (CP) from cognitively impaired (CI) multiple sclerosis (MS) patients.

Methods: Conventional MRI and DTI data were acquired from 55 MS patients (35 CP, 20 CI) and 30 healthy controls (HC). Voxelwise analyses were used to investigate fractional anisotropy (FA), mean diffusivity, radial diffusivity, and axial diffusivity of a WM skeleton.

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Purpose: Fatigue is a complex, multidimensional construct. Most questionnaires measuring fatigue do not meet the standards for good measurement properties. Therefore, the Neurological Fatigue Index for multiple sclerosis (NFI-MS) is recently developed using thorough methods.

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Background: In the end-of-life (EOL) phase, high-grade glioma (HGG) patients have a high symptom burden and often lose independence because of physical and cognitive dysfunction. This might affect the patient's personal dignity. We aimed to (a) assess the proportion of HGG patients dying with dignity as perceived by their relatives and (b) identify disease and care factors correlated with dying with dignity in HGG patients.

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Objective: Spinal cord (SC) lesions are frequently found in multiple sclerosis (MS), but are rare in healthy aging and cerebrovascular patients. Our aim was to analyze the contribution of SC involvement in clinically isolated syndrome (CIS) in diagnosing MS according the McDonald 2010 criteria and in predicting conversion to clinically definite MS (CDMS).

Methods: We prospectively followed monofocal, relapsing onset CIS patients with either SC or brain symptom onset (including optic neuritis).

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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.

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Background: Antibodies against natalizumab have been found in 4.5-14.1% of natalizumab-treated multiple sclerosis (MS) patients.

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Background: Depression in MS patients is frequent but often not treated adequately. An important underlying factor may be physical limitations that preclude face-to-face contact. Internet-based treatment showed to be effective for depressive symptoms in general and could thus be a promising tool for treatment in MS.

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Objective: To study the relationships between 1-2 year changes in well-known physician-rated measurements (Expanded Disability Status Scale (EDSS), Timed 25-Foot Walk (T25FW), 9-Hole Peg Test (9HPT)) and the long-term (≥ 5 years) outcome in patient-reported outcome (PRO) measures (Multiple Sclerosis Impact Scale (MSIS-29), Multiple Sclerosis Walking Scale (MSWS-12)) that reflect the patient-perceived impact of disease, in progressive MS.

Methods: We selected all progressive patients having at least two complete visits within 1-2 years, from a larger cohort of prospectively-followed MS patients. These were invited for another visit, at least 5 years later, consisting of another series of similar examinations, plus 2 PRO scales: the MSIS-29 and MSWS-12.

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Objective: To derive a simple score for estimating the long-term risk of osteoporotic and hip fracture in individual patients with MS.

Methods: Using the UK General Practice Research Database linked to the National Hospital Registry (1997-2008), we identified patients with incident MS (n = 5,494). They were matched 1:6 by year of birth, sex, and practice with patients without MS (control subjects).

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Neuroimaging measures hold promise for enhancing the detection of disease-related genetic variants. In this study, we use advanced multivariate regression methods to assess the predictive value of single nucleotide polymorphisms (SNPs) on several brain volumetric- and lesion-related neuroimaging measures in a well-characterized cohort of 326 patients with multiple sclerosis (MS). SNP selection was constrained to key epigenetic regulatory genes to further explore the emerging role of epigenetics in MS.

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A decline in everyday cognitive functioning is important for diagnosing dementia. Informant questionnaires, such as the informant questionnaire on cognitive decline in the elderly (IQCODE), are used to measure this. Previously, conflicting results on the IQCODEs ability to discriminate between Alzheimer's disease (AD), mild cognitive impairment (MCI), and cognitively healthy elderly were found.

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