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Hemodialysis
by: Liana Lee Sencin
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What is hemodialysis?
Hemodialysis is a treatment used for
patients to rid blood of metabolicwastes, urine, harmful toxins and
other extra fluids.
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Our Kidneys
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Excretory Functions
Maintains plasma osmolarity by
eliminating water
Maintains plasma pH near 7.4 byeliminating excess hydrogen
Excretes nitrogenous end products of
protein metabolism
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Endocrine Functions
Renin- affects sodium, fluid volume, and
blood pressure
Erythropoietin- which regulates redblood cell productions in bone marrow
Prostaglandin- regulates blood flow in
the kidneys
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Chronic Renal Failure
A person with thisdisorder will not
benefit from thenormal functionsof kidneys. Thereis complete renal
failure.
Diabetes
Hypertension
Glomerolunephritis
Cystic Disorders
Drug toxicity
Damage to supportingstructure of kidneys
Causes:
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Hemodialysis
Hollow -fiberDialyzer
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Hollow-fiber Dialyzer
Dialysate inflow tube
Dialysate outflow tube
Blood inflow tube
Blood outflow tube
10,000 hollow fibers
(large surface area)
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Process of Dialysis
Blood circulates outside the
body and passed through
the dialyzer
Comes into contact with acounter flow of dialysate
solution
Toxins are removed from
the blood through diffusion
Excess water is removedfrom the blood with a
certain amount of filtration
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Process of Dialysis
Blood is injected with
heparin, an anticoagulant.
Blood is then returnedback to the body through
the artery.
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Diffusion in Dialysis
Constant movement of dialysate
solution and maintains a high
concentration gradientElectrolytes are added to dialysate so
that there will be a healthy amount in
blood
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Ultrafiltration
Dialysis machine causes hydraulic pressure
There is higher pressure in blood
compartment than in the dialysatecompartment
This forces water and any other molecules
small enough to pass through themembrane to evacuate the blood.
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Works Cited
Sakai, Kiyotaka,2000. Frontiers Medical
Biological Engineering. Dialysis
membranes for blood purification.Vol.10, No. 2: 117-129.
www.yahoo.com
http://kidney.niddk.nih.gov/kudiseases/pubs/hemodialysis/index.htm
http://www.yahoo.com/http://kidney.niddk.nih.gov/kudiseases/pubs/hemodialysis/index.htmhttp://kidney.niddk.nih.gov/kudiseases/pubs/hemodialysis/index.htmhttp://kidney.niddk.nih.gov/kudiseases/pubs/hemodialysis/index.htmhttp://kidney.niddk.nih.gov/kudiseases/pubs/hemodialysis/index.htmhttp://www.yahoo.com/