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Concept
Limb–girdle muscular dystrophy
Summary
Limb–girdle muscular dystrophy (LGMD) is a genetically heterogeneous group of rare muscular dystrophies that share a set of clinical characteristics. It is characterised by progressive muscle wasting which affects predominantly hip and shoulder muscles. LGMD usually has an autosomal pattern of inheritance. It currently has no known cure or treatment.
LGMD may be triggered or worsened in genetically susceptible individuals by statins, because of their effects on HMG-CoA reductase
By definition, all limb girdle muscular dystrophies (LGMD) cause progressive proximal weakness, meaning weakness of the muscles on or close to the torso that worsens over time. Explicitly, LGMD preferentially affects muscles of the hip girdle, thigh, shoulder girdle, and/or upper arm. The muscle weakness is generally symmetric. Usually, the hip girdle is the first area to exhibit weakness, manifesting as difficulty walking, going up and/or down stairs, rising from a chair, bending at the waist, or squatting. Because of these difficulties, falling can occur frequently. Weakness of the shoulder girdle can make lifting objects, or even elevating the arms, difficult or impossible. Rate of progression varies between patients. Eventually, the abilities to run and walk can deteriorate. The disease commonly leads to dependence on a wheelchair within years of symptom onset, although some patients maintain mobility. Eventually the disease can affect other muscles such as the ones located in the face.
By definition, LGMDs primarily affect skeletal muscles, although cardiac muscle can be affected to a lesser degree in select subtypes, which can cause palpitations
There can be significant variability in disease features and severity between LGMD subtypes, and even within any given LGMD subtype. Additional possible presentations include:
In most cases, pain is not present with LGMD, and mental function is not affected. LGMD can begin in childhood, adolescence, young adulthood or even later, the age of onset is usually between 10 and 30.
Official source
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