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Kidney anatomy
Kidney anatomy


Membranoproliferative GN

Definition:

Membranoproliferative glomerulonephritis is a kidney disorder that involves inflammation and changes in the microscopic structure of kidney cells. It leads to disrupted kidney function.



Alternative Names:

Membranoproliferative GN I; Membranoproliferative GN II; Mesangiocapillary glomerulonephritis; Membranoproliferative glomerulonephritis; Lobular GN; Glomerulonephritis - membranoproliferative; MPGN type I; MPGN type II



Causes, incidence, and risk factors:

Glomerulonephritis is inflammation of the glomeruli, the inner structures of the kidney that help filter waste and fluids from the blood to form urine.

Membranoproliferative GN is a form of glomerulonephritis caused by an abnormal immune response . Deposits of antibodies build up in a part of the kidneys called the glomerular basement membrane. This membrane helps filter waste and extra fluid from the blood.

The changes in this membrane lead disrupt the body's ability to filter urine. Protein and fluid leak out of the blood vessels into body tissues, leading to swelling (edema ). Nitrogen waste products may build up in the blood (azotemia ) because of poor kidney functioning.

There are two forms of membranoproliferative GN:

  • Membranoproliferative GN I
  • Membranoproliferative GN II

Most cases are type I. Membranoproliferative GN II is much less common than Membranoproliferative GN I. It also tends to get worse faster than membranoproliferative GN I.

The conditions affect both men and women, mostly under age 30.



Symptoms:

Signs and tests:

The results of a physical examination vary depending on the symptoms. Swelling may be present along with signs of fluid overload, such as abnormal sounds when listening to the heart and lungs with a stethoscope.

Blood pressure is often high because of increased water and sodium (salt) retention and and increased production of renin , a hormone that controls blood pressure.

Membranoproliferative GN may present in several forms. It may be seen as acute nephritic syndrome , nephrotic syndrome , or an abnormal urinalysis without symptoms.

These tests help confirm the diagnosis:

A kidney biopsy confirms the diagnosis of membranoproliferative GN I.



Treatment:

Treatment depends on the symptoms. The goals of treatment are to reduce symptoms, prevent complications, and slow the progression of the disorder.

A change in diet may be needed. This may include limiting salt, fluids, or protein to help control high blood pressure, swelling, and the build up of waste products in the blood.

Medicines that may be prescribed include:

  • Blood pressure medications
  • Cytotoxic medications
  • Dipyridamole with or without aspirin
  • Diuretics
  • Steroids

Dialysis or kidney transplant may eventually be required to manage kidney failure.



Support Groups:



Expectations (prognosis):

The disorder often slowly gets worse and eventually results in chronic kidney failure . Fifty percent of cases lead to chronic renal failure within 10 years.



Calling your health care provider:

Call for an appointment with your health care provider if you have symptoms of this condition. Also call for an appointment with your health care provider if symptoms worsen or persist, or if new symptoms develop, including decreased urine output .



Prevention:

Prevention is often not possible.



References:

In: Brenner BM, ed. Brenner: Brenner and Rector's the Kidney. 8th ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 30.




Review Date: 8/12/2009
Reviewed By: Parul Patel, MD, Private Practice specializing in Nephrology and Kidney and Pancreas Transplantation, Affiliated with California Pacific Medical Center, Department of Transplantation, San Francisco, CA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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