Marcel G. M. Olde Rikkert

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BACKGROUND Alzheimer's disease (AD) pathology is common in patients with amnestic mild cognitive impairment (aMCI) without dementia, but the prevalence of AD pathology in patients with subjective cognitive impairment (SCI) and non-amnestic mild cognitive impairment (naMCI) is unknown. AD is characterised by decreased CSF concentrations of Abeta(42) and(More)
Frailty is the most problematic expression of population ageing. It is a state of vulnerability to poor resolution of homoeostasis after a stressor event and is a consequence of cumulative decline in many physiological systems during a lifetime. This cumulative decline depletes homoeostatic reserves until minor stressor events trigger disproportionate(More)
BACKGROUND Amyloid beta(40) (Abeta(40)) is the most abundant Abeta peptide in the brain. The cerebrospinal fluid (CSF) level of Abeta(40) might therefore be considered to most closely reflect the total Abeta load in the brain. Both in Alzheimer's disease (AD) and in normal aging the Abeta load in the brain has a large inter-individual variability. Relating(More)
Frailty is one of the greatest challenges for healthcare professionals. The level of frailty depends on several interrelated factors and can change over time while different interventions seem to be able to influence the level of frailty. Therefore, an outcome instrument to measure frailty with sound clinimetric properties is needed. A systematic review on(More)
IMPORTANCE Increasing evidence suggests a relationship between poor sleep and the risk of developing Alzheimer disease. A previous study found an effect of sleep on β-amyloid (Aβ), which is a key protein in Alzheimer disease pathology. OBJECTIVE To determine the effect of 1 night of total sleep deprivation on cerebrospinal fluid Aβ42 protein levels in(More)
OBJECTIVES The objectives of this study are to determine the prevalence of potentially inappropriate prescribing including potentially inappropriate medications (PIMs) and potential prescription omissions (PPOs) and to assess related risk factors in older people with major psychiatric illness. METHODS This was a cross-sectional study of older patients(More)
BACKGROUND The recently introduced diagnostic label of Mild Cognitive Impairment (MCI) identifies patients with a cognitive decline that is more pronounced than is usual for a person's age and educational level but does not notably interfere with activities of daily living (ADL). The natural course of the syndrome is uncertain although MCI sufferers have a(More)
Neprilysin, a zinc-metalloendopeptidase, has important roles in the physiology and pathology of many diseases such as hypertension, cancer and Alzheimer's disease. We have developed an immunocapture assay to measure the specific enzyme activity of neprilysin in brain tissue homogenates and cerebrospinal fluid (CSF). The assay uses a neprilysin-specific(More)
OBJECTIVE To investigate the effect of a medical food on cognitive function in people with mild Alzheimer's disease (AD). METHODS A total of 225 drug-naïve AD patients participated in this randomized, double-blind controlled trial. Patients were randomized to active product, Souvenaid, or a control drink, taken once-daily for 12 weeks. Primary outcome(More)