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renal vein thrombosis
Renal vein thrombosis (RVT) is the formation of a clot in the vein that drains blood from the kidneys, ultimately leading to a reduction in the drainage of one or both kidneys and the possible migration of the clot to other parts of the body.〔(【引用サイトリンク】url=http://www.nlm.nih.gov/medlineplus/ency/article/000513.htm )〕 First described by German pathologist Friedrich Daniel von Recklinghausen in 1861, RVT most commonly affects two subpopulations: newly born infants with blood clotting abnormalities or dehydration and adults with nephrotic syndrome. Nephrotic syndrome, a kidney disorder, causes excessive loss of protein in the urine, hypoalbuminemia, hypercholesterolemia and edema, triggering a hypercoagulable state and increasing chances of clot formation. Other less common causes include hypercoagulable state, cancer, renal transplantation, behcet syndrome, antiphospholipid antibody syndrome or blunt trauma to the back or abdomen. Treatment of RVT mainly focuses on preventing further blood clots in the kidneys and maintaining stable renal function. The use of anticoagulants has become the standard treatment in treating this abnormality.〔 Membranous Glomerulonephritis, the most common cause for nephrotic syndrome in adults, peaks in people ages 40–60 years old and It is twice as likely to occur in men than in women. Since nephrotic syndrome is the most common cause of RVT, people over 40 years old and men are most at risk to develop a renal vein thrombosis.〔
==Mechanism==
The mechanism behind RVT is no different from other types of blood clots in other parts of the body. Rudolf Virchow, was the first to describe the physiological mechanism behind venous thrombosis (blood clots) using three related factors, known as Virchow's Triad; damage to the blood vessel (endothelial damage), decrease in blood flow (stasis) and increased coagulability of the blood (thrombophilia or hypercoagulability). it is possible for one of these factors alone to cause a blood clot, but in most cases, a combination or all of these factors induce the formation of a blood clot. Decreased urine output or renal function may be the only observable symptoms caused by a blood clot renal vein. Other less common causes include hypercoagulable state, invasion by renal cell cancer, renal transplantation, behcet syndrome, antiphospholipid antibody syndrome or blunt trauma to the back or abdomen.〔
Blood clot diagram
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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