Abstract
Myotonic dystrophy type 1 (DM1) is the most frequent muscular dystrophy in adult. The aim of this study was to investigate the natural history of skeletal muscle weakness in adults, in a cross-sectional, retrospective study. In a cohort of 204 adult DM1 patients, we quantified muscle impairment, handgrip force and physical disability. Muscle strength was similarly affected in the legs and in the arms, the right and left side, and distally more than proximally in patients. The earliest and the most affected skeletal muscles were the digit flexors, foot dorsiflexors and neck flexors; whereas the elbow and knee extensors and flexors were the least affected muscle groups. The rate of decline of the muscle strength was −0.111 units/year. The handgrip values were lower in DM1 patients than the normative values and the rate of decline in handgrip force per year was −0.24 kg. Limitation in mobility or walking is observed in 84 % of DM1 patients but requirement of wheelchair is infrequent (3 %). The decrease in muscle strength, handgrip force and the increase in physical disability were highly correlated with duration of the disease and the number of CTG repeats in the blood. Significant association was found between decline in muscle strength and the age at onset, physical disability and the age of patients at evaluation, handgrip force and gender. Decline in muscle weakness is very slow and although limitation when walking is a common manifestation of DM1 in patients, the requirement of wheelchair is infrequent.
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Acknowledgments
The authors thank the patients for participating. They also thank Sun Makosso-Kallyth from the department of Biostatistics of the CHU de Québec for his very valuable statistical advice. The French muscular association against myopathies (AFM) and the “Réseau de Médecine Génétique Appliquée du FRSQ” (RMGA) provided funding for this study. Integrity of Research and reporting.
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The authors declare that they have no conflict of interest.
Ethical standard
All patients gave an informed consent to participate to the registry, which was approved by the local medical ethics committee. This study has been performed in accordance with the ethical standards laid down in the 1965 Declaration of Helsinski and its later amendments.
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Bouchard, JP., Cossette, L., Bassez, G. et al. Natural history of skeletal muscle involvement in myotonic dystrophy type 1: a retrospective study in 204 cases. J Neurol 262, 285–293 (2015). https://doi.org/10.1007/s00415-014-7570-x
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DOI: https://doi.org/10.1007/s00415-014-7570-x