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Equine polysaccharide storage myopathy (EPSM, PSSM, EPSSM) is a hereditary glycogen storage disease of horses that causes exertional rhabdomyolysis.It is currently known to affect the following breeds American Quarter Horses, American Paint Horses, Warmbloods, Cobs, Dales Ponies, Thoroughbreds, Arabians, New Forest ponies, and a large number of Heavy horse breeds.
[4] [3] On single-fiber examination, features may include increased jitter (seen in other diseases of neuromuscular transmission) and blocking. [ 4 ] Blood tests may be performed to exclude other causes of muscle disease (elevated creatine kinase may indicate a myositis , and abnormal thyroid function tests may indicate thyrotoxic myopathy ).
Limb girdle muscular dystrophies (LGMD) as defined by the European Neuromuscular Centre in 2018. [1] [2] They are named by the following system: LGMD, recessive or dominant inheritance (R or D), order of discovery (number), affected protein. [1] LGMD D1 DNAJB6-related; LGMD D2 TNP03-related; LGMD D3 HNRNPDL-related; LGMD D4 calpain3-related
However, any horse that can store excess amounts of glycogen, usually genetic, can develop this form of ER. [1] Recurrent Exertional Rhabdomyolysis (RER) is commonly found in breeds that are high strung such as Arabians and thoroughbreds. However, any horse can develop this type of ER if it displays abnormal muscle contractions. [1]
Equine protozoal myeloencephalitis in various stages. Equine protozoal myeloencephalitis (EPM) is a disease that affects the central nervous system of horses.It is caused by a protozoal infection that is brought about by the apicomplexan parasites Sarcocystis neurona or Neospora hughesi.
Glycogen-branching enzyme deficiency (GBED) is an inheritable glycogen storage disease affecting American Quarter Horses and American Paint Horses. It leads to abortion, stillbirths, or early death of affected animals. The human form of the disease is known as glycogen storage disease type IV.
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Additionally, horses with a hind limb lameness will tend to reduce the degree of leg use. To do so, some horses will reduce the contraction time of the gluteals on the side of the lame leg, leading to a "hip roll" or "hip dip" and appearance that the hip drops a greater degree on the side of the lame leg. [10]