Often, weakness is first noted in the shoulder muscles and proximal leg muscles. Weakness is progressive and will eventually become profound, but children may survive into early adulthood. There is no treatment for the progressive weakness caused by the disease. Supportive care is important. Attention must be paid to the respiratory system as affected people have difficulty clearing secretions and respiratory complications are common.
Physiotherapy is important to prevent contractures and scoliosis .
Bracing may be necessary. The most severe form of spinal muscular atrophy is fatal early on. The less severe form is compatible with a longer lifespan. However, progressive weakness and debility are present in all forms. Call your health care provider if your child appears weak, has difficulty feeding, or develops any other of the symptoms of spinal muscular atrophy.