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Facioscapulohumeral muscular dystrophy: a prospective study of weakness and functional impairment

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Abstract

Only isolated prospective studies have attempted to chart the natural history of facioascapulohumeral muscular dystrophy (FSHD), a benign myopathy with notoriously variable clinical manifestations and progression. This 10-year prospective study was performed to document by simple clinical methods the natural history of 16 patients with moderately advanced FSHD. Limb strength was evaluated by the bedside manual muscle test. Global weakness was documented as a composite average muscle score (AMS). Limb function was evaluated by a non-linear grading system of important functional milestones. A scale of activities of daily living (ADL) was used to assess disability across multiple functional domains in a home environment. Six-monthly evaluations determined a linear deterioration of the mean AMS that reached statistical significance from baseline at the 5-year interval. Half of patients showed a functional decline of the arms by one grade. All patients maintained useful hand function. Three quarters of patients suffered functional decline of the legs, commonly by one grade. All patients remained ambulant. Interval analyses showed a linear deterioration of the mean ADL score that reached statistical significance from baseline at the 5-year interval. Functional deterioration was mostly due to impaired shoulder girdle activities. This study of a relatively homogeneous subgroup of FSHD patients showed a predictable rate of clinical progression in a muscle disease with a notoriously variable clinical presentation and outcome. Natural history data obtained in this study could serve as positive controls for future therapeutic trials in this patient population. The chosen clinical parameters proved useful tools for charting clinical disease progression. Functional tests proved advantageous, because decline was based partly on patient self-reports, thereby improving time and cost effectiveness.

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Acknowledgments

This study was supported by the Phyllis Knocker/Bradlow Award from The College of Medicine of South Africa.

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Authors and Affiliations

  1. Department of Neurology, University of Pretoria, Pretoria, South Africa

    Joerg-Patrick Stübgen

  2. Department of Rehabilitation Medicine, University of Pretoria, Pretoria, South Africa

    Annette Stipp

  3. Department of Neurology and Neuroscience, Cornell University Medical College, New York Presbyterian Hospital, 525 East 68th Street, New York, NY, 10065-4885, USA

    Joerg-Patrick Stübgen

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  1. Joerg-Patrick Stübgen
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  2. Annette Stipp
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Correspondence to Joerg-Patrick Stübgen.

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Stübgen, JP., Stipp, A. Facioscapulohumeral muscular dystrophy: a prospective study of weakness and functional impairment. J Neurol 257, 1457–1464 (2010). https://doi.org/10.1007/s00415-010-5544-1

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  • DOI: https://doi.org/10.1007/s00415-010-5544-1

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