apheresis

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apheresis

(əfĕr`əsĭs), or

hemapheresis

(hē'məfĕr`əsĭs), any procedure in which bloodblood,
fluid pumped by the heart that circulates throughout the body via the arteries, veins, and capillaries (see circulatory system; heart). An adult male of average size normally has about 6 quarts (5.6 liters) of blood.
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 is drawn from a donor or patient and a component (platelets, plasmaplasma,
in physics, fully ionized gas of low density, containing approximately equal numbers of positive and negative ions (see electron and ion). It is electrically conductive and is affected by magnetic fields.
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, or white blood cells) is separated out, the remaining blood components being returned to the body. Apheresis allows the donor's blood volume to replenish itself much more quickly than whole blood donation. One type of apheresis, plasmapheresis, is commonly used in commercial blood banksblood bank,
site or mobile unit for collecting, processing, typing, and storing whole blood, blood plasma and other blood constituents. Most hospitals maintain their own blood reserves, and the American Red Cross provides a nationwide collection and distribution service.
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. In plasmapheresis the plasma (the liquid portion of the blood) is separated from donated blood, the red blood cells being returned to the donor. In some diseases, such as myasthenia gravismyasthenia gravis
, chronic disorder of the muscles characterized by weakness and a tendency to tire easily. It is caused by an autoimmune attack on the acetylcholine receptor of the post synaptic neuromuscular junction.
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, plasmapheresis is used to attempt to remove the disease-causing substances from the blood.
References in periodicals archive ?
However, patients with more severe disease may be referred to secondary or tertiary care hospitals which have intensive care and blood centre units which can perform platelet aphaeresis.
To this end he employed errors and vices of speech that rhetors lump together under the umbrella term enallage (including solecismus, anthypallage, and anthimeria, to name a few); other vices of speech that characterize the language of Clemens's ordinary Americans are barbarismus, antistoecon, acyrologia, synalepha, aphaeresis, syncope, and apocope.
Classier examples are apheresis instead of aphaeresis and dieresis instead of diaeresis.
Therapeutic Aphaeresis and Dialysis with The International Society for Aphaeresis, The Japanese Society for Aphaeresis and The Japanese Society for Dialysis Therapy
Terumo's transfusion division sells mainly low-tech products such as blood bags, blood filters and aphaeresis systems that are used to separate blood components.
Aa - Two units of red blood cells can be donated at one time, using a process known as red cell aphaeresis.