Σφακιανάκης Αλέξανδρος
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Πέμπτη 17 Αυγούστου 2017

The cognitive profile of myotonic dystrophy type 1 A systematic review and meta-analysis

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Publication date: Available online 16 August 2017
Source:Cortex
Author(s): Kees Okkersen, Melanie Buskes, Johannes Groenewoud, Roy P.C. Kessels, Hans Knoop, Baziel van Engelen, Joost Raaphorst
ObjectiveTo examine the cognitive profile of patients with myotonic dystrophy type 1 (DM1) on the basis of a systematic review and meta-analysis of the literature.MethodsEmbase, Medline and PsycInfo were searched for studies reporting ≥1 neuropsychological test in both DM1 patients and healthy controls. Search, data extraction and risk of bias analysis were independently performed by two authors to minimize error. Neuropsychological tests were categorized into 12 cognitive domains and effect sizes (Hedges' g) were calculated for each domain and for tests administered in ≥5 studies.ResultsDM1 participants demonstrated a significantly worse performance compared to controls in all cognitive domains. Effect sizes ranged from -0.33 (small) for verbal memory to -1.01 (large) for visuospatial perception. Except for the domains global cognition, intelligence and social cognition, wide confidence intervals were associated with moderate to marked statistical heterogeneity that necessitates careful interpretation of results. Out of the individual tests, the Rey-Osterrieth complex figure-copy (both non-verbal memory and visuoconstruction) showed consistent impairment with acceptable heterogeneity.ConclusionIn DM1 patients, cognitive deficits may include a variable combination of global cognitive impairment with involvement across different domains, including social cognition, memory and visuospatial functioning. Although DM1 is a heterogeneous disorder, our study shows that meta-analysis is feasible, contributes to the understanding of brain involvement and may direct bedside testing. The protocol for this study has been registered in PROSPERO (International prospective register of systematic reviews) under ID: 42016037415.



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