Celeste
Unregistered User
(12/22/02 10:48 pm)
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Renovascular Hypertension and FMD according to lifeclinic.co
When researching FMD with www.lifeclinic.com this is what they said:
What is renovascular hypertension (renal artery stenosis)?
This is by far the commonest cause of secondary hypertension, and accounts for about 3 per cent of all cases of hypertension. It's caused by a narrowing in one or both renal (kidney) arteries. This reduces the blood pressure and flow in the kidney, which responds by secreting a hormone called renin, which enters the blood stream and leads to the formation of a second hormone (angiotensin), which causes the blood pressure to go up. There are two quite distinct causes of renovascular hypertension. The first, which occurs in young people (particularly children and young women), is called fibromuscular dysplasia.
There are one or more fibrous constrictions of the artery. An important aspect of this condition is that it hardly ever affects any arteries other than the ones supplying the kidneys. Nobody knows what causes it, although smoking may be a contributory factor. It usually does not run in families.
The second cause is atherosclerosis, sometimes referred to as hardening of the arteries, which is the same process that causes strokes and heart attacks. It occurs in the middle aged and elderly, and plaques may develop in the renal arteries just as they do in other major vessels. The affected kidney also begins to shrink, and to lose its capacity to excrete other waste products. Since atheromatous blockages tend to get worse over time, this condition is an important cause of renal failure and the eventual need for dialysis.
The treatment of renovascular hypertension is usually by surgery or angioplasty.
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