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10 things you should know about Stiff-Person Syndrome

Stiff-person syndrome (SPS) is a rare neurological disorder with features of an autoimmune disease.

Stiff-person syndrome (formerly called stiff-man syndrome) affects mainly the brain and spinal cord (the central nervous system), but it causes symptoms similar to those of some peripheral nerve disorders.

The characteristic findings associated with SPS are progressive, fluctuating muscular rigidity that occurs along with muscle spasms. The severity and progression of SPS can vary from one person to another. The symptoms usually develop over a period of months and may remain stable for many years or slowly worsen.

Below are 10 things women should know about Stiff-Person Syndrome:

1. SPS is characterized by fluctuating muscle rigidity in the trunk and limbs and a heightened sensitivity to stimuli such as noise, touch, and emotional distress, which can set off muscle spasms. Abnormal postures, often hunched over and stiffened, are characteristic of the disorder.

2. People with SPS can be too disabled to walk or move, or they are afraid to leave the house because street noises, such as the sound of a horn, can trigger spasms and falls.

3. SPS affects twice as many women as men.

4. It is frequently associated with other autoimmune diseases such as diabetes, thyroiditis, vitiligo, and pernicious anemia.

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5. Scientists don’t yet understand what causes SPS, but research indicates that it is the result of an autoimmune response gone awry in the brain and spinal cord.

6. The disorder is often misdiagnosed as Parkinson’s disease, multiple sclerosis, fibromyalgia, psychosomatic illness, or anxiety and phobia.

7. A definitive diagnosis can be made with a blood test that measures the level of glutamic acid decarboxylase (GAD) antibodies in the blood.  People with SPS have elevated levels of GAD, an antibody that works against an enzyme involved in the synthesis of an important neurotransmitter in the brain.

8. A recent study funded by the NINDS demonstrated the effectiveness of intravenous immunoglobulin (IVIg) treatment in reducing stiffness and lowering sensitivity to noise, touch, and stress in people with SPS.

9. Treatment with IVIg, anti-anxiety drugs, muscle relaxants, anti-convulsants, and pain relievers will improve the symptoms of SPS, but will not cure the disorder.  Most individuals with SPS have frequent falls and because they lack the normal defensive reflexes; injuries can be severe.  With appropriate treatment, the symptoms are usually well controlled.

10. The life expectancy for people with Stiff-Person Syndrome ranges from 6 to 28 years from the onset of the condition.

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