Types of Spinal Muscular Atrophy: Symptoms and Prognosis
Spinal muscular atrophy, or SMA, is a group of genetic disorders that affects muscle movement. This happens due to a loss of nerve cells in the spinal cord and brainstem, which causes weakness and muscle wasting. SMA is both a type of motor neuron disease and a neurological condition. There are some types of SMA that can be fatal, while other types may have mild symptoms. The various types of SMA, their symptoms, and prognosis include the following: 1. SMA1 Type Onset The onset of this condition occurs within the first six months after birth. Symptoms Muscle weakness is the main symptom and difficulty in moving the muscles become apparent. The child can never sit on its own. The floppy limbs give it the name “floppy baby syndrome.” The main problem with this type of SMA is difficulty with swallowing and breathing. Prognosis The lifespan may be around two years for around 68% of patients. Moreover, the lifespan for around 82% of patients is around four years. However, proper respiratory care and treatment can help extend their lifespan. One of the severe types of spinal muscular atrophy (SMA) is SMA 0 (which is a variant of SMA1). The babies affected face severe symptoms and breathing problems that can be fatal.