Renal artery stenosis
What are the kidneys?
The kidneys are two fist-sized organs located on either side of the spine behind the abdominal cavity. Each kidney receives blood from the aorta through each of the major blood vessels, renal arteries.
In the kidney, separated waste and small amounts of fluid from the blood to form urine. In this way, rid the body of harmful substances. The kidneys have an important function by regulating the fluid in the body. When we drink a lot, makes the kidneys more urine than when we drink very little. This keeps the body about the same amount of fluid intake is, however. For wastes to be separated, even though, we should drink at least 1-2 liters of water every day.
In addition, the kidney contributes to the production of some hormones that help regulate blood pressure in the body. These hormones are called renin, angiotensin and aldosterone and is formed when there is little blood to a kidney. Increased secretion of these hormone's results in reduced urine production and contraction of a number of blood vessels in the body. This leads to increased blood pressure. In some situations, such as severe water shortages, this is beneficial. However, in other situations, it can lead to harmful high blood pressure that sometimes required treatment.
In renal artery, stenosis is a narrowing of one or both renal arteries. There are two main reasons for this narrowing:
In young people, you will typically about an overgrowth of muscle tissue of the vessel wall. This is called fibromuskulær dysplasia. You know not the cause of this growth, but it has nothing to do with cancer.
In elderly people, there is often a matter of calcium deposits in the renal arteries. Have calcium deposits in many of the blood vessels in the body, known as hardening of the arteries ( atherosclerosis ).
Small renal artery stenosis is common, and they give no problems. When they reach a certain size, there may be consequences. The most common problems are high blood pressure and kidney failure.
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