Understanding Spinal Muscular Atrophy
There are over three lakh children with spinal muscular atrophy (SMA) in India, but awareness about the disease is poor. SMA is a disease that robs people of physical strength. It affects the motor nerve cells in the spinal cord, and takes away the ability to walk, eat, or breathe.
It is the number one genetic cause of death for infants.
Why SMA happens
SMA is caused by a mutation in the survival motor neuron gene 1 (SMN1). In a healthy person, this gene produces a protein that is critical to the function of the nerves that control our muscles. Without it, those nerve cells cannot properly function and eventually die, leading to debilitating and often fatal muscle weakness.
People with SMA find it hard to swallow, breathe, and perform other basic functions. However, it does not affect the ability to think, learn, and form bonds.
Types of SMA
There are four types of SMA and each come with a different set of challenges.The earlier the symptoms develop, the more severe the condition.
- Type 1 – Also known as Werdnig-Hoffmann Disease, this is the most common and the most severe as well and is typically diagnosed in the first six months after birth. Babies face many challenges, which include muscle weakness, breathing difficulty, coughing, and swallowing. They may need breathing assistance or a feeding tube. This is often fatal early in life and is the most common type.
- Type 2 – Usually diagnosed between seven to 18 months. Children cannot stand on their own and feel a weakness in the muscles of the arms and legs. They may also have weakened breathing muscles.
- Type 3 – Also known as Kugelberg-Welander Disease. Usually diagnosed by the age of three but can come later in life. This is less severe than the others. The child may have trouble standing up, balancing, using the stairs, or running. They may also lose the ability to walk later in life.
- Type 4 – This is very rare and usually surfaces in adulthood. Leads to mild motor impairment. Symptoms can begin as early as age 18 as well.
Challenges of SMA
SMA affects all aspects of daily life, making the child completely dependent in almost all aspects. There is a risk of complications as well. “Staying informed about the condition is important to give the child what they need to live a fulfilling and healthy life,” says Archana Panda, Co-founder, Cure SMA Foundation of India, parent to a child with the condition.
The two major complications related to Types 1 and 2 are breathing and spinal curvature. A child with SMA is at higher risk of developing severe respiratory infections and respiratory muscle weakness is generally the cause of death in children these types of SMA.
Scoliosis also develops as the muscles supporting the spine are often weak. This is very common in type 2. The first signs are seen when the child reaches the age of 8 or 9.
Diagnosis & Treatment
Diagnosis requires a genetic test and this is performed only in a few hospitals in India. Doctors in India know little, making support a challenge. In the United States, there is a drug called Spinraza, which is seen as effective but hard for parents in India to access given the high costs. Specialized physiotherapist trained in neuromuscular conditions is required.
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