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Encyclopedia > Apheresis
Whole blood enters the centrifuge on the left and separates into layers so that selected components can be drawn off on the right.
Whole blood enters the centrifuge on the left and separates into layers so that selected components can be drawn off on the right.

Apheresis is a medical technology in which the blood of a donor or patient is passed through an apparatus that separates out one particular constituent and returns the remainder to the circulation. While being related to it, it is distinct from dialysis, which does not separate directly but rather uses osmosis. Image File history File links A diagram to show how apheresis works, created by Viki Male 17/09/04 File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links A diagram to show how apheresis works, created by Viki Male 17/09/04 File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Biomedical engineering is a discipline concerned with the development and manufacture of prostheses, medical devices, diagnostic devices, drugs and other therapies. ... Red blood cells (erythrocytes) are present in the blood and help carry oxygen to the rest of the cells in the body Blood is a circulating tissue composed of fluid plasma and cells (red blood cells, white blood cells, platelets). ... In medicine, dialysis is a method for removing waste such as urea from the blood when the kidneys are incapable of this (i. ... Osmosis is the diffusion of a solvent through a semipermeable membrane from a region of low solute concentration to a region of high solute concentration. ...

Contents


Method

Depending on the substance that is being removed, different processes are employed in apheresis. If separation by weight is required, centrifugation would be the method of choice. Other methods involve absorbation onto beads coated with an absorbent material. Weight is the force exerted upon an object by virtue of its position in a gravitational field. ... Centrifugation involves the use of the centrifugal force for the separation of mixtures. ...


Types of apheresis

Disinfect, insert the cannula, pull out the cannula, dress the wound. The blue pressure cuff is controlled by the platelet apheresis machine in newer models.
Disinfect, insert the cannula, pull out the cannula, dress the wound. The blue pressure cuff is controlled by the platelet apheresis machine in newer models.

There are numerous types of apheresis: Download high resolution version (1920x640, 54 KB)Blood donation. ... Download high resolution version (1920x640, 54 KB)Blood donation. ...

Plasmapheresis is the removal of (components of) blood plasma from the circulation. ... Blood plasma is the liquid component of blood, in which the blood cells are suspended. ... Plateletpheresis is a special type of blood donation that allows the blood transfusion that only transfers platelets, the cells that cause blood clotting, and sometimes, a small amount of unwanted white blood cells (WBCs) to the recipient. ... A 250 ml bag of newly collected platelets. ... leukapheresis A laboratory procedure in which white blood cells are separated from a sample of blood. ... White Blood Cells is also the name of a White Stripes album. ... Bone marrow is the tissue comprising the center of large bones. ... Bone marrow transplantation is a medical procedure that involves stem cell transplantation. ... In medicine, LDL apheresis is a form of apheresis, resembling dialysis, to eliminate the cholesterol-containing particle low-density lipoprotein (LDL) from the bloodstream. ... Low-density lipoprotein (LDL) refers to a class and range of lipoprotein particles, varying somewhat in their size and contents, which carry cholesterol in the blood and around the body, for use by various cells. ... In medicine, familial hypercholesterolemia is a rare disease characterised by very high LDL cholesterol and early cardiovascular disease running in families. ...

Uses

Donation

Blood componenents can be separated from a collected bag of whole blood or from a donor's blood flow before collected to a blood bag. Various blood components are obtained by apheresis from donors. This includes platelets and blood plasma. Blood donation is a process by which a blood donor voluntarily has blood drawn for storage in a blood bank for subsequent use in a blood transfusion. ... A 250 ml bag of newly collected platelets. ... Blood plasma is the liquid component of blood, in which the blood cells are suspended. ...


Therapy

The assembly (A-D), operation (E) and disassembly (F) of the platelet apheresis machine which can be configured to separate other componenents as well.
The assembly (A-D), operation (E) and disassembly (F) of the platelet apheresis machine which can be configured to separate other componenents as well.
Please refer to the individual apheresis methods for use in diseases

The various apheresis techniques may be used whenever the removed constituent is causing severe symptoms of disease. Generally, apheresis has to be performed fairly often, and is an invasive process. It is therefore only employed if other means to control a particular disease have failed, or the symptoms are of such a nature that waiting for medication to become effective would cause suffering or risk of complications. Download high resolution version (2880x640, 118 KB)These pictures were taken by me with my cellphone camera. ... Download high resolution version (2880x640, 118 KB)These pictures were taken by me with my cellphone camera. ...


See also

Leukoreduction is the reduction of white blood cells or leukocytes from the blood or blood components being transfused to the recipient. ...

External links


  Results from FactBites:
 
NationMaster - Encyclopedia: Apheresis (1037 words)
Apheresis is a medical technology in which the blood of a donor or patient is passed through an apparatus that separates out one particular constituent and returns the remainder to the circulation.
In medicine, LDL apheresis is a form of apheresis, resembling dialysis, to eliminate the cholesterol-containing particle low-density lipoprotein (LDL) from the bloodstream.
Apheresis donors' donations go through additional typing called Human Leukocyte Antigen (HLA) typing to ensure that the match between donor and recipient is as close as possible.
Apheresis | Give Life | American Red Cross (377 words)
Apheresis is most commonly used to collect platelets and plasma.
Many apheresis donors find the knowledge that they are helping a specific individual in need particularly rewarding.
Apheresis donations are by appointment only — call 1-800-GIVE LIFE to schedule an appointment.
  More results at FactBites »

 
 

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