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Definition:

Muscle function loss is when a muscle doesn't work or move normally. The medical term for complete loss of muscle function is paralysis.



Alternative Names:

Paralysis; Paresis; Loss of movement; Motor dysfunction



Considerations:

Loss of muscle function may be caused by:

  • Injury such as a broken neck or back
  • Nerve damage (neuropathy)
  • Not using a muscle
  • Stroke or other brain injury

The loss of muscle function after these types of events can be severe, and often will not completely return.

Paralysis can be temporary or permanent. It can affect a small area (localized) or be widespread (generalized). It may affect one side (unilateral) or both sides (bilateral).

If the paralysis affects the lower half of the body and both legs it is called paraplegia. It if affects both arms and legs, it is called quadriplegia. If the paralysis affects the muscles that cause breathing, it is quickly life threatening.



Common Causes:

Causes of paralysis include:



Home Care:

Sudden loss of muscle function is a medical emergency. Seek immediate medical help.

After you have received medical treatment, your doctor may recommend some of the following measures:

  • Follow your prescribed therapy.
  • If the nerves to your face or head are damaged, you may have difficulty chewing and swallowing or closing your eyes. In these cases, a soft diet may be recommended. You will also need some form of eye protection, such as a patch over the eye while you are asleep.
  • Long-term immobility can cause serious complications. Change positions often and take care of your skin. Range-of-motion exercises may help to maintain some muscle tone.
  • Splints may help prevent muscle contractures , a condition in which a muscle becomes permanently shortened.


Call your health care provider if:

Muscle paralysis always requires immediate medical attention. If you notice gradual weakening or problems with a muscle, get medical attention as soon as possible.



What to expect at your health care provider's office:

The doctor will perform a physical examination and ask questions about your medical history and symptoms, including:

  • Location
    • What part(s) of the body are affected?
    • Does it affect one or both sides of the body?
    • Did it develop in a top-to-bottom pattern (descending paralysis), or a bottom-to-top pattern (ascending paralysis)?
    • Do you have difficulty getting out of a chair or climbing stairs?
    • Do you have difficulty lifting your arm above your head?
    • Do you have problems extending or lifting your wrist (wrist drop)?
    • Do you have difficulty gripping (grasping)?
  • Symptoms
  • Time pattern
    • Do episodes occur repeatedly (recurrent)?
    • How long do they last?
    • Is the muscle function loss getting worse (progressive)?
    • Is it progressing slowly or quickly?
    • Does it become worse over the course of the day?
  • Aggravating and relieving factors
    • What, if anything, makes the paralysis worse?
    • Does it get worse after you take potassium supplements by mouth?
    • Is it better after you rest?

Tests that may be performed include:

Intravenous feeding or feeding tubes may be required in severe cases. Physical therapy, occupational therapy, or speech therapy may be recommended.



References:

Griggs RC, Józefowicz RF, Aminoff MJ. Approach to the patient with neurologic disease. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa. Saunders Elsevier; 2007: chap 418.

Barohn RJ. Muscle diseases. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa. Saunders Elsevier; 2007: chap 447.




Review Date: 11/13/2008
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and Daniel B. Hoch, PhD, MD, Assistant Professor of Neurology, Harvard Medical School, Department of Neurology, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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