MICHAEL DONNE / SCIENCE PHOTO LIBRARY MICHAEL DONNE / SCIENCE PHOTO LIBRARY
Kidney dialysis. Nurse adjusting the position of a patient's arm during haemodialysis treatment. Blood is flowing out of a blood vessel in the patient's forearm, down one of the tubes, and into a dialysis machine. This acts as an 'artificial kidney' to remove waste products and excess fluid from the blood. The filtered blood is then returned through a second tube into the patient's body. This cleaning of the blood is usually done by the kidneys. If they are damaged, waste products build up in the blood, which can be fatal. Haemodialysis takes between 2 and 6 hours and must be carried out several times a week.
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