Progressive muscular dystrophy

Progressive muscular dystrophy (Orphanet code 206644) is a broad grouping term encompassing a heterogeneous set of inherited muscular dystrophies characterized by progressive skeletal muscle weakness and degeneration. These conditions affect the musculoskeletal system primarily, leading to increasing difficulty with movement, ambulation, and in many cases respiratory and cardiac function over time. The hallmark feature across this group is the gradual loss of muscle mass and strength, which may begin in proximal or distal muscle groups depending on the specific subtype. Patients may experience difficulty walking, frequent falls, contractures of joints, scoliosis, respiratory insufficiency, and in some forms, cardiomyopathy. Because this Orphanet entry represents a classification grouping rather than a single discrete disease entity, it encompasses multiple subtypes of muscular dystrophy including but not limited to Duchenne, Becker, limb-girdle, Emery-Dreifuss, and facioscapulohumeral muscular dystrophies, among others. Each subtype has its own specific genetic cause, inheritance pattern, age of onset, and clinical trajectory. Diagnosis typically involves clinical evaluation, serum creatine kinase levels, electromyography, muscle biopsy, and increasingly, genetic testing to identify the specific causative mutation. Treatment is largely supportive and varies by subtype. Corticosteroids (such as deflazacort or prednisone) are used in Duchenne muscular dystrophy to slow disease progression. Physical therapy, orthopedic interventions, respiratory support, and cardiac monitoring are cornerstones of management across subtypes. Gene-targeted therapies, including exon-skipping antisense oligonucleotides and gene replacement strategies, have been approved or are under investigation for specific forms. Multidisciplinary care involving neurologists, pulmonologists, cardiologists, and rehabilitation specialists is essential to optimize quality of life and longevity.

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