spinal muscle atrophy (redirected from Spinal muscle atrophy-Types)

spinal muscle atrophy

Werdnig-Hoffmann disease Neurology A group of conditions that cause progressive muscle degeneration and weakness; SMA is the 2^nd most common fatal AR disorder after cystic fibrosis, affecting 1:6000-20,000 newborns/yr–US; SMAs selectively affect the α motor neuron, and are characterized by anterior horn cell degeneration, accompanied by muscle weakness, atrophy, progressive symmetrical limb and trunk paralysis; in type I, the most severe form, infants have weak muscles, feeding and breathing problems, death usually occurs before age 3; other types affect increasingly older Pts

Spinal muscle atrophy–Types

I Acute/infantile onset form of Werdig-Hoffmann

II Intermediate/childhood onset form

III Juvenile onset form of Kugelberg-Welander

IV Adult onset form