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Statin-associated autoimmune myopathy (SAAM), also known as anti-HMGCR myopathy, is a very rare form of muscle damage caused by the immune system in people who take statin medications. [1] However, there are cases of SAAM in patients who have not taken statin medication, and this can be explained by the exposure to natural sources of statin ...
Other statins have a small risk of 0.44 cases per 10 000 person-years. [9] Previous chronic kidney disease and hypothyroidism increase the risk of myopathy due to statins. It is also more common in the elderly, those who are severely disabled, and when statins are used in combination with particular other medicines, such as ciclosporin. [14] [9]
Common types of myopathy due to statins include myalgia, myositis, and rhabdomyolysis. Statins induce myopathy by inhibiting protein synthesis within the muscle. [6] Statin therapy tends to not show any histopathological differences, and thus a biopsy does not reveal too much about the damage. Often, the damage is found within the mitochondria.
Statin-induced hepatotoxicity can cause autoimmune hepatitis and an elevation in serum levels of hepatic enzymes such as alanine aminotransferase, impairing liver function. [20] Myotoxicity is commonly presented with statin-associated muscle symptoms (SAMS), which include myalgia and myositis. [21]
Part of the power of statins lies in the fact that they cause few side effects. “Generally, about 90 out of 100 people have no trouble with a stain,” says Dr. Blumenthal.
Metabolic myopathies, which affect the production of ATP within the muscle cell, typically present with dynamic (exercise-induced) rather than static symptoms. [4] Most of the inflammatory myopathies can have a chance association with malignant lesion; the incidence appears to be specifically increased only in patients with dermatomyositis.
Distal muscular dystrophy, also called distal myopathy, is essentially any muscle disease that preferentially affects the hands and/or feet, a much less common pattern than proximal muscle weakness. Late adult-onset type 1; Late adult-onset type 2a; Late adult-onset type 2b; Early adult-onset type 1; Early adult-onset type 2; Early adult-onset ...
The presence of anti HMG-CoA reductase antibodies is seen in people with statin-associated autoimmune myopathy, which is a very rare form of muscle damage caused by the immune system in people who take statin medications. [24] The exact mechanism is unclear.