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What is Hemodialysis

2014-06-22 18:01

HemodialysisHemodialysis as of now is most commonly used blood purification technology for kidney failure patients and refers to a medical method that is used to achieve the extracorporeal removal of waste products such as creatinine and urea when kidneys fail to function well.

Application of hemodialysis is based on semipermeable membrane which only allows small substances to pass through. When blood flow in the extracorporeal circuit, because of concentration difference between the two sides of semipermeable membrane, wastes with small molecular substances in the blood flow into dialysis fluid and meanwhile, nutrition in the dialysis fluid like calcium ion flow into blood. In this way, some wastes produced by our body is cleared away from the blood. Besides, as semipermeable membrane only allows small substances get out of our body, wastes and toxins in the blood can not be fully cleared through hemodialysis.

Hemodialysis is one of the dominant blood purification technologies, so at the moment, it is indispensable for kidney failure patients. However, as hemodialysis only helps to remove some wastes in the blood and can not recover kidney function, once patients start, they need to receive hemodialysis regularly. Hemodialysis is a contradictory medical therapy, as on one hand, it helps to sustain kidney failure patients' life; on another hand, it brings complicated complications, especially when patients receive hemodialysis for a very long time.

Common hemodialysis side effects include low blood pressure, muscle cramp, nausea, vomit, headache, chest pain, back pain, heart problem, itchy skin and coma and so on. These side effects can be caused by different conditions during dialysis, so with different causes, we need to take different medical measurements to deal with them.

In clinic, although hemodialysis is commonly used by kidney failure patients, it also can be used to deal with some other medical conditions like drug poisoning, serious electrolyte disturbance, acid base disturbance, severe fever and hypothermia and so on.

Hemodialysis is just one of the types of dialysis and apart from it, there are peritoneal dialysis, Intestinal dialysis and so on. Different kinds of dialysis help to remove different kinds of wastes, so adopting a right dialysis method is very important for kidney failure patients.

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