Quarter Horse

Malignant hyperthermia (MH) is a rare inherited disease that can cause a life-threatening condition triggered by anesthesia drugs.

Polysaccharide storage myopathy (PSSM) results in an abnormal accumulation of glycogen, the form of sugar stored in muscle, causing “tying up”.

Glycogen branching enzyme deficiency is a fatal disease of developing fetuses or newborn foals. It is inherited in some breeds and a genetic test is available.

MYHM describes two muscle diseases caused by a mutation in the MYH1 gene; immune mediated myositis and nonexertional rhabdomyolysis.

HYPP is a muscular disease caused by a genetic mutation that results in an excessive amount of potassium in the blood.

Hereditary equine regional dermal asthenia is an inherited degenerative skin disease in Quarter Horses and related breeds. A genetic test is available.