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Male urinary system
Male urinary system


Definition:

Lupus nephritis is a kidney disorder that is a complication of systemic lupus erythematosus .



Alternative Names:

Nephritis - lupus; Lupus glomerular disease



Causes, incidence, and risk factors:

Lupus nephritis occurs when antibodies (antinuclear antibody and others) and complement build up in the kidneys, causing inflammation. It often causes nephrotic syndrome (excessive protein excretion) and may progress rapidly to renal failure . Nitrogen waste products build up in the bloodstream.

Systemic lupus erythematosus (SLE) causes various disorders of the internal structures of the kidney, including interstitial nephritis and membranous GN . Lupus nephritis affects approximately 3 out of 10,000 people. In children with SLE, about half will have some form or degree of kidney involvement.

SLE is most common in women 20-40 years old. For more information, see the general article on systemic lupus erythematosus .



Symptoms:

Symptoms of lupus nephritis include:

For general lupus symptoms, see the article on SLE .



Signs and tests:

A physical exam shows signs of decreased kidney functioning with edema . Blood pressure may be high. Abnormal sounds may be heard when the doctor listens to the heart and lungs, indicating fluid overload.

Lupus nephritis is usually discovered during investigation of the causes of reduced kidney function. Fewer than half of patients have other symptoms of SLE at the time of diagnosis of lupus nephritis.

Tests that may be done include:

A kidney biopsy is not used to diagnose lupus nephritis, but to determine what treatment is appropriate.

This disease may also alter the results of the following tests:

Treatment:

The goal of treatment is to improve of kidney function. Medicines may include corticosteroids or other immunosuppressive medications.

Dialysis may be needed to control symptoms of kidney failure. A kidney transplant may be recommended. (People with active lupus should not have a transplant.)



Support Groups:



Expectations (prognosis):

The outcome varies depending on the specific form of lupus nephritis. Patients may have acute flare-ups with alternating symptom-free periods.

Some cases of lupus nephritis may progress to chronic kidney failure.

Although lupus nephritis may return in a transplanted kidney, it rarely leads to end stage kidney disease.



Calling your health care provider:

Call your health care provider if blood in the urine or swelling of the body develops.

If you have lupus nephritis, call your health care provider if there is decreased urine output .



Prevention:

There is no known prevention for lupus nephritis.



References:

Harris ED. Budd RC, Genovese MC, Firestein GS, Sargent JS, Sledge CB. Kelley's Textbook of Rheumatology. 7th ed. St. Louis, Mo: WB Saunders; 2005.

Noble J. Textbook of Primary Care Medicine. 3rd ed. St. Louis, Mo: Mosby; 2001.




Review Date: 8/14/2007
Reviewed By: Charles Silberberg, DO, Private Practice specializing in Nephrology, Affiliated with New York Medical College, Division of Nephrology, Valhalla, NY. Review provided by VeriMed Healthcare Network.

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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