hypertension q and what is the purpose of the iliac artery?

alsoin hypertension it is said tht when pressure increases in the brain ,damage occurs to the blood vessels and they may rupture.This causes a stroke with bleeding in the brain.what does it mean by the pressure increase in the brain?

Written By Nurse007

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  • Mrs. Doubtfire February 23, 2009, 12:01 am

    Dear Cute. Remember while reading most of the answers above that giving common things big fancy names sounds impressive, but isn't very helpful, and does not mean the answer's correct. So here goes, trying to say it in simple language.
    The brain needs blood flow through fine tubes (capillaries) to nourish the cells. To cause blood to flow it needs a pressure difference between one end of the tube and the other, – just like a voltage, a current, and a wire. So the blood vessels in the brain are all pressurised in this way, and conduct blood flow back to the heart.
    The vessels, being so fine, are also vulnerable to rupture, (as is a balloon say), – and as one ages, the elasticity of the walls decreases, so any large increase in the pressure which the pumping action of the heart can burst the walls, and (a) cut off blood from where it should go, and (b) allow it to seep out and form pools and clots where it shouldn't.
    There! No "arteriosclerosis" or "ischemic" or "aneurism" needed, – just simple English.
    I would just add one thing. Most strokes are not the result of steady high pressures, but transient peaks added on to the normal ones, similar to the flashovers occurring in an electric circuit. So you can live for years with steady high pressures (systolic, diastolic, mean, and pulse-pressures) perfectly safely. It's the sudden bang on the head, or startling gun-shot, or emotional fright which is most likely to trigger a bursting of the blood vessels in the brain.

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