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Why do you need an arterio venous fistula to do haemodialysis?

by sameeralord
Tags: arterio, fistula, haemodialysis, venous
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sameeralord
#1
Dec29-13, 04:27 AM
P: 640
Hello everyone,

Why do you need to create an arterio venous fistula for haemodialysis? I don't understand how it makes a good access site for dialysis. Also when not performing dialysis, wouldn't this AV fistula be bad for the body. The deoxygenated and venous blood with all its wastes mixing with arterial blood due to fistula (I'm assuming due to higher pressure in arteries, arterial blood flows to veins not vise versa but still isn't it bad for arterial blood to get mixed with venous). Also in dialysis why should the blood be pumped back into the person, isn't their a way to filter it right at the start, pumping blood back would make the person more prone to infection. Thanks
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aroc91
#2
Dec30-13, 01:45 PM
P: 166
http://en.wikipedia.org/wiki/Hemodialysis#AV_fistula

The complications are fewer than with other access methods. If a fistula has a very high blood flow and the vasculature that supplies the rest of the limb is poor, a steal syndrome can occur, where blood entering the limb is drawn into the fistula and returned to the general circulation without entering the limb's capillaries. This results in cold extremities of that limb, cramping pains, and, if severe, tissue damage
Quote Quote by sameeralord View Post
but still isn't it bad for arterial blood to get mixed with venous?
Why would it be? As long as it doesn't significantly affect circulation and oxygen perfusion, it shouldn't really have an effect.

Quote Quote by sameeralord View Post
Also in dialysis why should the blood be pumped back into the person, isn't their a way to filter it right at the start, pumping blood back would make the person more prone to infection. Thanks
Not sure what you mean here.


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