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Spinal muscular atrophy (SMA) life expectancy varies between types. The most severe types of SMA have a life expectancy of less than 2 years, while less severe types do not impact life...
Spinal muscular atrophy (SMA) is a genetic, progressive disease that affects the nervous system and muscles. The life expectancy for people with SMA depends on the type of their disease and symptom severity. For some types, SMA life expectancy is very short — from soon after birth to about 2 years old.
Spinal muscular atrophy (SMA) is a genetic condition that causes worsening muscle weakness. There are five subtypes, which range in severity and age of onset. There’s no cure for SMA, but certain therapies and medications can help manage symptoms.
The life expectancy and prognosis of spinal muscular atrophy (SMA) vary widely between types. People with the most severe types may only live a few months. People with the mildest types have a normal lifespan.
There are four main subtypes of spinal muscular atrophy defined by the age of onset and severity with type 0 presenting in utero and causing death within the first months of life and type 4 in adulthood, causing mild weakness and no effect on lifespan.
The most common form of SMA is caused by changes in a gene known as the survival motor neuron gene 1 (SMN1). Traditionally, there are five types of this form of SMA, which are classified based on the average age of onset and severity of symptoms.
What Is the Life Expectancy of Someone with Spinal Muscular Atrophy? What Happens? The survival rate for children with SMA type 1 is about 7 years old with a mortality rate of 95 percent by 18 months old. Spinal muscular atrophy (SMA) is a hereditary disorder characterized by progressive muscle weakening and atrophy (when the muscles get smaller).
Spinal muscular atrophy (SMA) is characterized by muscle weakness and atrophy resulting from progressive degeneration and irreversible loss of the anterior horn cells in the spinal cord (i.e., lower motor neurons) and the brain stem nuclei.
In the most common form of SMA (chromosome 5 SMA, or SMN-related SMA), there is wide variability in age of onset, symptoms, and rate of progression. In order to account for these differences, chromosome 5-related SMA, which often is autosomal recessive, is classified into types 1 through 4.
At present, there is no cure for SMA. Those affected by the disorder can work with their health care providers to manage SMA symptoms and prevent complications, which can contribute to quality of life.