Cognitive impairment in adult myotonic dystrophies: a longitudinal study.
The clinical relevance and extent of cognitive impairment in adult myotonic dystrophy type 1 ( DM1) and 2 (DM2) is still unclear. The aim of this study was to determine whether previously reported cognitive abnormalities progress over time and if this occurs in DM2 as it does in DM1. Fifty-six patients with DM1 and 29 patients with DM2 were subjected to muscle strength assessment, and to a complete battery of neuropsychological tests. Repeated assessment was performed in 20 DM1 and 13 DM2 over time ( DM1 mean follow-up: 7.3+/-2.7 years; DM2 mean follow- up: 9.5+/-2.4 years). Muscle strength and test scores for frontal lobe functions worsened significantly over time (p<0.01), in both DM1 and DM2. DM2 is a progressive muscle disorder, although less severe than DM1. In both DM1 and DM2 frontal cognitive impairment (attentional) worsens over time but does not extend to additional areas of cognition.[1]References
- Cognitive impairment in adult myotonic dystrophies: a longitudinal study. Sansone, V., Gandossini, S., Cotelli, M., Calabria, M., Zanetti, O., Meola, G. Neurol. Sci. (2007) [Pubmed]
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