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.
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References in periodicals archive ?
it's just a matter of positioning," the pheresis nurse
Optimization of peripheral blood stem cell collections using peripheral blood CD34 levels and routine high volume pheresis. Blood 1998;15:124a.
raised a caveat that a disabling treatment could "trigger a duty of accommodation" only if it was "truly necessary, and not merely an attractive option."(117) The court suggested that because Christian's doctor was currently prescribing a regimen of drugs and exercise to treat her condition, the pheresis was merely "optional," not a required treatment that would invoke the ADA's protections.
The United States District Court for the Northern District of Indiana granted summary judgment - a hearing based on the facts of a case without a trial - to the hospital ruling that Christian's condition was not a disability and that pheresis was a treatment option, not a requirement.
Auto-immune therapies range from drugs such as steroids to more complicated treatments such as plasma pheresis, whereby aberrant proteins are separated from the blood of the patient, which is then returned to the circulatory system.
A technique, called peripheral stem cell pheresis, is performed after priming the patients bone marrow with substances known as growth factors during a critical period after certain chemotherapy courses.
The pheresis procedure takes about two hours and costs approximately $1,000 per treatment.
However, CDC (2002) and NKF (2006) vascular access guidelines indicate that when placing a catheter for HD or pheresis, one should use the jugular or femoral vein rather than subclavian vein to avoid venous stenosis, which could permanently exclude the future placement of an arterial-venous fistula or graft.
The book also includes discussions of specialized blood products such as leukocyte-reduced blood products, cytomegalovirus-reduced risk blood products, granulocyte transfusions, platelets and platelet pheresis, immunoglobulins, and fibrin sealants.