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Why some patients have to undergo dialys...

Why some patients have to undergo dialysis ? How does it help ?

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Patients suffering from kidney filters the blood and purifies it. When it their blood (diabetic patentis) have to undergo dialysis. Kidney filters the blood and purifies it. When it stops functioning, blood has got to be purified in an artificial kidney maching called dialyser. It takes blood from artery and after purification, i.e., separation of axcess ions and waste products sends back to veins.
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