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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 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.
Rhabdomyolysis (shortened as rhabdo) is a condition in which damaged skeletal muscle breaks down rapidly, often due to high intensity exercise over a short period. [6] [4] [5] Symptoms may include muscle pains, weakness, vomiting, and confusion. [3] [4] There may be tea-colored urine or an irregular heartbeat.
First symptoms are usually muscular weakness, soreness and stiffness causing problems with walking and breathing. Within hours of first symptoms horse may be unable to stand and in 72 hours of the onset of signs mortalities may occur. [16] [13] [1] The mortality rate of atypical myopathy is high; only 30-40% of affected horses survive. [9]
Equine exertional rhabdomyolysis; Equine gastric ulcer syndrome; Equid alphaherpesvirus 1; Equid alphaherpesvirus 3; Equine infectious anemia; Equine influenza; Equine melanoma; Equine multinodular pulmonary fibrosis; Equine polysaccharide storage myopathy; Equine protozoal myeloencephalitis; Equine proximal enteritis; Equine recurrent uveitis ...
Horses initially experience stiffness, weakness, and a decreased appetite followed by the rapid loss of 40% of muscle mass within 72 hours. The second presentation of MYHM is Nonexertional Rhabdomyolysis (compare to PSSM, below) and often presents as stiffness and possible swelling of muscles along the back and haunches without exercise.
Myoglobinuria is the presence of myoglobin in the urine, which usually results from rhabdomyolysis or muscle injury. [1] Myoglobin is present in muscle cells as a reserve of oxygen . Signs and symptoms
This inherited disease is characterized by violent muscle twitching and substantial muscle weakness or paralysis among affected horses. HYPP is a dominant genetic disorder; therefore, heterozygotes bred to genotypically normal horses have a statistic probability of producing clinically affected offspring 50% of the time.