Skeletal muscle weakness with fasciculations is a hallmark of spinal muscular atrophy (SMA), a genetic disorder that affects nerve cells responsible for controlling voluntary muscle movement.
Caused by mutations in the survival motor neuron 1 (SMN1) gene, SMA is characterized by progressive muscle weakness and wasting, leading to respiratory failure, loss of mobility, and decreased life expectancy.
Causes and Risk Factors
SMA is caused by a mutation in the SMN1 gene, which codes for a protein essential for the production of myelin, the fatty substance that surrounds and protects nerve fibers.
- Family history of SMA or other muscular dystrophies
- Pregnancy complications, such as preterm birth or low birth weight
- Maternal age over 35 years
Symptoms and Diagnosis
Symptoms of SMA may vary depending on the severity of the mutation and the age at which symptoms appear.
- Progressive muscle weakness, particularly in the lower limbs
- Fasciculations (muscle twitching) visible under the skin
- Loss of reflexes
- Short stature and delayed puberty
- Respiratory failure and loss of mobility
Diagnosis is typically made through genetic testing, imaging studies (e.g., MRI), and electromyography (EMG) to assess muscle strength and reflexes.
Treatment Options
There are currently three FDA-approved treatments for SMA: nusinersen (Spinraza), onasemnogene abeparvovec-xioi (Zolgensma), and risdiplam (Evrysdi).
- Nusinersen (Spinraza): injectable treatment that increases SMN protein production
- Onasemnogene abeparvovec-xioi (Zolgensma): gene therapy that replaces the mutated SMN1 gene
- Risdiplam (Evrysdi): oral treatment that raises SMN protein levels in nerve cells
Lifestyle Changes and Support
While there is no cure for SMA, early diagnosis and treatment can significantly improve quality of life.
Patients with SMA may benefit from physical therapy, occupational therapy, and respiratory support to manage symptoms and maintain mobility.
Get Support Today
If you or a loved one is affected by spinal muscular atrophy, please contact us to learn more about treatment options and lifestyle changes that can help manage the condition.
Call us now at +256 752 333 444 or email [info@michoesmedicalcentre.com](mailto:info@michoesmedicalcentre.com) to schedule a consultation with our expert team.
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