<unk>  is a congenital neuromuscular channelopathy that affects skeletal muscles (muscles used for movement). It is a genetic disorder. The hallmark of the disease is the failure of initiated contraction to terminate, often referred to as delayed relaxation of the muscles (myotonia) and rigidity. Symptoms include delayed relaxation of the muscles after voluntary contraction (myotonia), and may also include stiffness, hypertrophy (enlargement), transient weakness in some forms of the disorder (from certain genetic mutations), severe masseter spasm, and cramping. The condition is sometimes referred to as fainting goat syndrome, as it is responsible for the eponymous 'fainting' seen in fainting goats when presented with a sudden stimulus. Of note,<unk>  has no association with malignant hyperthermia (MH).
Myotonia congenita
Myotonic dystrophy
Paramyotonia congenita
Periodic paralysis
Klumpke paralysis
Quadrigia
Cardiofaciocutaneous syndrome
Hyperkalemic periodic paralysis