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Definition Renal vein thrombosis develops when a blood clot forms in the renal vein, which carries blood from the kidneys back to the heart. The disorder is not common. Description Renal vein thrombosis occurs in both infants and adults. Onset of the disorder can be rapid (acute) or gradual. The number of people who suffer from renal vein thrombosis is difficult to determine, as many people do not show symptoms, and the disorder is diagnosed only by specific tests. Ninety percent of childhood cases occur in children under one year old, and 75% occur in infants under one month of age. In adult women, oral contraceptive use increases the risk of renal vein thrombosis. Causes and symptoms In children, renal vein thrombosis almost always occurs rapidly after an episode of severe dehydration. Severe dehydration decreases blood volume and causes the blood to clot more readily. In adults, renal vein thrombosis can be caused by injury to the abdomen or back, as a result of malignant kidney tumors growing into the renal vein, or as a result of kidney diseases that cause degenerative changes in the cells of the renal tubules (nephrotic syndrome). Acute onset of renal vein thrombosis at any age causes pain in the lower back and side, fever, bloody urine, decreased urine output, and sometimes kidney failure. In adults, when the onset of the disorder is gradual, there is a slow decrease in kidney function, and protein appears in the urine. Many adults with renal vein thrombosis show few symptoms. Diagnosis Renal venography, where a contrast material (dye) is injected into the renal vein before x rays are taken, is one of the best ways to detect renal vein thrombosis. Other useful tests to detect a clot include computed tomography scans (CT scans), magnetic resonance imaging (MRI), and ultrasound. Treatment One of the major goals of treatment is to prevent the blood clot in the renal vein from detaching and moving into the lungs, where it can cause serious complications as a pulmonary embolism. The enzyme streptokinase may be given to help dissolve the renal clot. Anticoagulant medications are usually prescribed to prevent clots from recurring. Rarely, when there is a complete blockage of the renal vein in infants, the kidney must be surgically removed. Prognosis Most cases of renal vein thrombosis resolve without any permanent damage. Death from renal vein thrombosis is rare, and is often caused by the blood clot detaching and lodging in the heart or lungs. Prevention There is no specific prevention for renal vein thrombosis. Preventing dehydration reduces the risk that it will occur. For Your Information Books - "Vascular Diseases of Acute Onset: Renal Vein Thrombosis." In The Merck Manual of Diagnosis and Therapy. 16th ed. Ed. Robert Berkow. Rahway, NJ: Merck Research Laboratories, 1992.
Organizations- National Kidney Foundation. 30 East 33rd St., New York, NY 10016. (800) 622-9010.http://www.kidney.org
Other- "Renal Vein Thrombosis." HealthAnswers.com.
Source: Gale Encyclopedia of Medicine, Published December, 2002 by the Gale Group
The Essay Author is Tish Davidson A.M..
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