| 1. |
- De Guio, François, et al.
(författare)
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Reproducibility and variability of quantitative magnetic resonance imaging markers in cerebral small vessel disease
- 2016
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Ingår i: Journal of Cerebral Blood Flow and Metabolism. - 0271-678X. ; 36:8, s. 1319-1337
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Forskningsöversikt (refereegranskat)abstract
- Brain imaging is essential for the diagnosis and characterization of cerebral small vessel disease. Several magnetic resonance imaging markers have therefore emerged, providing new information on the diagnosis, progression, and mechanisms of small vessel disease. Yet, the reproducibility of these small vessel disease markers has received little attention despite being widely used in cross-sectional and longitudinal studies. This review focuses on the main small vessel disease-related markers on magnetic resonance imaging including: white matter hyperintensities, lacunes, dilated perivascular spaces, microbleeds, and brain volume. The aim is to summarize, for each marker, what is currently known about: (1) its reproducibility in studies with a scan-rescan procedure either in single or multicenter settings; (2) the acquisition-related sources of variability; and, (3) the techniques used to minimize this variability. Based on the results, we discuss technical and other challenges that need to be overcome in order for these markers to be reliably used as outcome measures in future clinical trials. We also highlight the key points that need to be considered when designing multicenter magnetic resonance imaging studies of small vessel disease.
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| 2. |
- Dichgans, Martin, et al.
(författare)
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METACOHORTS for the study of vascular disease and its contribution to cognitive decline and neurodegeneration : An initiative of the Joint Programme for Neurodegenerative Disease Research
- 2016
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Ingår i: Alzheimer's and Dementia. - : Wiley. - 1552-5260 .- 1552-5279. ; 12:12, s. 1235-1249
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Tidskriftsartikel (refereegranskat)abstract
- Dementia is a global problem and major target for health care providers. Although up to 45% of cases are primarily or partly due to cerebrovascular disease, little is known of these mechanisms or treatments because most dementia research still focuses on pure Alzheimer's disease. An improved understanding of the vascular contributions to neurodegeneration and dementia, particularly by small vessel disease, is hampered by imprecise data, including the incidence and prevalence of symptomatic and clinically “silent” cerebrovascular disease, long-term outcomes (cognitive, stroke, or functional), and risk factors. New large collaborative studies with long follow-up are expensive and time consuming, yet substantial data to advance the field are available. In an initiative funded by the Joint Programme for Neurodegenerative Disease Research, 55 international experts surveyed and assessed available data, starting with European cohorts, to promote data sharing to advance understanding of how vascular disease affects brain structure and function, optimize methods for cerebrovascular disease in neurodegeneration research, and focus future research on gaps in knowledge. Here, we summarize the results and recommendations from this initiative. We identified data from over 90 studies, including over 660,000 participants, many being additional to neurodegeneration data initiatives. The enthusiastic response means that cohorts from North America, Australasia, and the Asia Pacific Region are included, creating a truly global, collaborative, data sharing platform, linked to major national dementia initiatives. Furthermore, the revised World Health Organization International Classification of Diseases version 11 should facilitate recognition of vascular-related brain damage by creating one category for all cerebrovascular disease presentations and thus accelerate identification of targets for dementia prevention.
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| 3. |
- Gislason, Thorsteinn, et al.
(författare)
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Effect of diagnostic criteria on the prevalence of frontotemporal dementia in the elderly
- 2015
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Ingår i: Alzheimer's & Dementia. - : Wiley. - 1552-5260 .- 1552-5279. ; 11:4, s. 425-433
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Frontotemporal dementia (FTD) is believed to be rare in the elderly, and the influence of different criteria on the prevalence of FTD is unclear. METHODS: Population-based samples of 70- to 95-year-olds (n = 2462) in Gothenburg, Sweden, underwent neuropsychiatric examinations. Behavioral variant FTD (bvFTD) was diagnosed according to the International Behavioural Variant FTD Criteria Consortium (FTDC), the Frontotemporal Lobe Degeneration Consensus criteria, and the Lund-Manchester Research Criteria. A subset (n = 1074) underwent computerized tomography (CT) of the brain. RESULTS: The prevalence of bvFTD varied between 0.2% and 0.5% at age 70 to 79 years, between 2.5% and 3.6% at age 80 to 89 years, and between 1.7% and 2.2% at age 90 to 95 years. The agreement between different criteria was low to moderate (κ = 0.20-0.42). Among those with bvFTD according to FTDC, 93.3% had frontal and/or temporal lobar atrophy on CT, compared with 12.6% of those without bvFTD (P < .001). CONCLUSIONS: The prevalence of bvFTD was higher than expected in this population. To a large extent, different criteria captured different individuals.
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| 4. |
- Gudmundsson, Pia, 1978, et al.
(författare)
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White Matter Lesions and Temporal Lobe Atrophy Related to incidence of both Dementia and Major Depression in 70-year-olds followed over 10 years
- 2015
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Ingår i: European Journal of Neurology. - : Wiley. - 1351-5101 .- 1468-1331. ; 22:5, s. 781-788
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Tidskriftsartikel (refereegranskat)abstract
- Abstract Background: A number of studies have suggested associations between dementia and depression in older adults. One reason could be that these disorders share structural correlates, such as white matter lesions (WMLs) and cortical atrophy. No study has examined whether these lesions precede both dementia and depression independently of each other in the general population. Methods: We investigated whether WMLs and cortical atrophy on computed tomography (CT) predict dementia and depression in a population-based sample of 70-year-olds (n=380) followed over 10 years. Exclusion criteria were dementia, major depression, history of stroke and a Mini-Mental State Examination score below 26 at baseline in 2000-01. Dementia was diagnosed according to DSM-III-R and depression according to DSM-5. Primary outcomes included dementia and major depression at 10-year follow-up. Results: Adjusted logistic regression models, including both WMLs and temporal lobe atrophy, showed that moderate-to-severe WMLs (OR 3.96, 95% CI 1.23-12.76) and temporal lobe atrophy (OR 2.93, 95% CI 1.13-7.60) predicted dementia during 10-year follow-up independently of major depression. Similarly, both moderate-to-severe WMLs (OR 3.84, 95% CI 1.25-11.76) and temporal lobe atrophy (OR 2.52, 95% CI 1.06-5.96) predicted depression even after controlling for incident dementia. Conclusion: WMLs and temporal lobe atrophy preceded 10-year incidence of both dementia and depression in 70-year-olds. Shared structural correlates could explain the reported associations between dementia and depression. These brain changes may represent independent and complementary pathways to dementia and depression. Strategies to slow progression of vascular pathology and neurodegeneration could indirectly prevent both dementia and depression in older adults.
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