Muscular Dystrophy

(MD)

Definition

Muscular dystrophy is a group of inherited, progressive muscle disorders. All forms cause progressive weakness and degeneration of the muscles that control movement. Some also affect the heart or other organs. Age of onset is between infancy to adulthood. The different forms include:
  • Duchenne dystrophy, which is the most common
  • Becker dystrophy, which is a milder form of Duchenne dystrophy
  • Myotonic muscular dystrophy, which can begin in late adulthood
  • Facioscapulohumeral muscular dystrophy, which affects the muscles of the face, shoulder blades, and upper arms
  • Congenital muscular dystrophy, which is diagnosed on or near birth and results in overall muscle weakness
  • Distal muscular dystrophy, which affects the distal muscles of the lower arms, hands, lower legs, and feet
  • Emery-Dreifuss muscular dystrophy, which affects the muscles of the shoulders, upper-arms, and calf muscles
  • Limb-girdle muscular dystrophy, which affects the muscles around the hips and shoulders
  • Oculopharyngeal muscular dystrophy, which affects swallowing and the ability to keep the eyes open

Causes

This condition is caused by defects in genes that control muscle development and function. In some cases, the genes are passed from parent to child. In other cases, the genetic mutation occurs spontaneously.

Risk Factors

These factors increase your chance of developing muscular dystrophy. Tell your doctor if you have any of these risk factors:
  • Family member with muscular dystrophy
  • Sex: males are at increased risk for Duchenne dystrophy and Becker dystrophy

Symptoms

Each type of muscular dystrophy has its own unique symptoms. For example, the muscles that are affected may differ depending upon the type.Symptoms common to most forms of muscular dystrophy may include:Initial symptoms:
  • Progressive weakening of muscles
  • Enlargement of muscles as they weaken
  • Muscle cramping
  • Clumsiness
  • Frequent falling and difficulty getting up
Later symptoms:
  • Muscle contraction and stiffening
  • Muscle deterioration
Severe Muscle Contraction of the Hand
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Symptoms specific to Duchenne and Becker dystrophy include:
  • Initial symptoms:
    • Usually muscles closest to the trunk become weak first. Then, muscles further away weaken as the disease advances.
    • Enlargement of calf muscles as they weaken
  • Later symptoms
    • Abnormally curved spine
    • Respiratory infections
    • Severe muscle deterioration, usually leading to use of a wheelchair
    • Difficulty breathing
    • Muscle contraction and stiffening—often severe
    • Distortion of the body
    • Reduced intelligence
Symptoms specific to myotonic muscular dystrophy include:
  • Difficulty letting go after a handshake
  • Reduced intelligence
  • Excessive sleeping
Symptoms usually become worse over time. In many forms, life expectancy is shortened.

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