Haemodialysis is a process in which the patient’s blood is led out of the
body into a dialyser where the excess water, toxins and electrolyte are filtered
out and basic group is added into the blood, then the purified blood would be
back into the body. The hemodialysis can do replace what the kidney ought to do
but can not do because of the pathological changes.
Kidney has many important functions for our body. Apart from excreting the
metabolic wastes out of the body, it could also adjust the metabolism and have
endocrine functions as well.
Dialysis can only replace 20 percent of the filtering function of the
kidneys; other functions kidneys possess can not be replaced by kidneys, like
composition, disintegration and secretion of hormones, secretion of
EPO(erythropoietin) and active vitamin D, etc.
Long-time dialysis can lead to complications like anemia and metabolic
disorder of the bone.
Adequate dialysis means that the dialysis can clear enough toxins and water
out of the body, and patients feel comfortable and can enjoy a relatively high
quality of life. Clinically, the following indicators are often used to evaluate
whether the dialysis is adequate or not:
1. Patients have no overt discomfort during dialysis, can take care of
themselves and do family chores. And patients have good nutrition, better
appetite and physical strength and increased dry weight.
2. During the period of dialysis, the increased weight does not surpass 3% to
5% of the patient's dry weight, and the patients’ electrolyte and PH balance
does not have obvious changes.
3.The blood pressure can be sustained at the normal range(with the help of
the hypotensor), and heart failure do not present.
4. During dialysis, circulatory accident does not happen and long-term
complications related to dialysis do not occur.
5. With the normal diet, the BUN is sustained at an acceptable level. After
dialysis, the BUN level would be lowered by 60% to 70%.
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