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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.
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.
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]
In the 1960s, a syndrome dubbed "segmental myelitis" was first reported in horses in the US by Rooney and colleagues. [3] Later, in the 1970s, it was recognized by Mayhew and colleagues that the syndrome was associated with an infection by protozoa, and the current name of the disease, "equine protozoal myeloencephalitis", was coined. [3]
Neospora hughesi is an obligate protozoan apicomplexan parasite that causes myelitis and equine protozoal myeloencephalitis (EPM) in horses, and has only been documented in North America. [1] EPM is a neurological disease from lesions in the spinal cord, brain stem, or brain from parasites such as N. hughesi or Sarcocystis neurona. [2]
Lameness is most commonly caused by pain, but may also be the result of neuromuscular disease or mechanical restriction. Lameness itself is a clinical sign, and not a diagnosis. [2] Trauma is a common cause of lameness in horses.
Shivers, or equine shivering, is a rare, progressive neuromuscular disorder of horses. It is characterized by muscle tremors, difficulty holding up the hind limbs, and an unusual gait when the horse is asked to move backwards. Shivers is poorly understood and no effective treatment is available at this time.
Hyperkalemic periodic paralysis (HYPP, HyperKPP) is a genetic disorder that occurs in horses. It is also known as Impressive syndrome, after an index case in a horse named Impressive. It is an inherited autosomal dominant disorder that affects sodium channels in muscle cells and the ability to regulate potassium levels in the blood.