What is Kennedy Disease
Kennedy disease, also known as spinal bulbar
muscular atrophy or SBMA, is an inherited neurological disorder.
Kennedy disease affects the lower motor neurons, which are
responsible for movement of the arms. It also affects the nerves
which supply the bulbar muscles, which control breathing,
swallowing, and talking. Kennedy disease can also affect the
endocrine system and the regulation of fats (lipids) in the blood.
Kennedy disease is caused by a genetic defect on the X (female)
chromosome. Since males have only one X chromsome, they are most
severely affected by the disorder. Females, who have two X
chromsomes, may carry the defective gene on one X chromsome, but
the other normal X chromsome lessens or hides the symptoms of the
disorder. Kennedy disease is estimated to occur in 1 in 40,000
individuals worldwide.
Symptoms
On average, symptoms begin in individuals aged 40-60 years.
Symptoms come on slowly, and may include:
Weakness and muscle cramps in the arms and legs
Weakness of the face, mouth, and tongue muscles. The chin may
twitch or quiver, and the voice may become more nasal.
Twitching of small muscles which can be seen under the skin.
Tremors or trembling with certain positions. The hands may tremble
when trying to pick up or hold something.
Numbness or loss of sensation over certain areas of the body.
Kennedy disease may have other effects on the body, including:
Gynecomastia, meaning enlargement of breast tissue in males
Disorders of fats (lipids) in the blood
Diabetes mellitus (blood sugar problems).
Diagnosis
There are a number of neuromuscular disorders with symptoms
similar to Kennedy disease, so misdiagnosis or underdiagnosis is
common.
Treatmnet
Kennedy disease does not affect life expectancy, so treatment is
focused on maintaining the individual's optimum muscle function
throughout his life. Physical therapy, occupational therapy, and
speech therapy are important for maintaining an individual's
abilities and for adapting to the progression of the disease.
Adaptive equipment can help maintain mobility and independence.
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