Apheresis |
Apheresis (ἀφαίρεσις (aphairesis, "a taking away")) is a medical technology in which the blood of a person is passed through an apparatus that separates out one particular constituent and returns the remainder to the circulation. It is thus an extracorporeal therapy.
One of the uses of apheresis is for collecting hematopoetic stem cells.[1]
Depending on the substance that is being removed, different processes are employed in apheresis. If separation by density is required, centrifugation is the most common method. Other methods involve absorption onto beads coated with an absorbent material[2] and filtration.[3]
The centrifugation method can be divided into two basic categories:[4]
Continuous flow centrifugation (CFC) historically required two venipunctures as "continuous" means the blood is collected, spun, and returned simultaneously. Newer systems can use a single venipuncture by pooling blood in a vessel and cycling through drawing and returning blood though the needle while the centrifuge continuously processes blood remaining in the vessel.[5] The main advantage of this system is the low extracorporeal volume (calculated by volume of the apheresis chamber, the donor's hematocrit, and total blood volume of the donor) used in the procedure, which may be advantageous in the elderly and for children.
Intermittent flow centrifugation (IFC) works in cycles, taking blood, spinning/processing it and then giving back the unused parts to the donor in a bolus. The main advantage is a single venipuncture site. It does require a larger extracorporeal volume, and takes significantly longer to perform the procedure via IFC. As such, it is less likely to be used for therapeutic reasons, and is often seen in Donation Center settings.[6] To stop the blood from coagulating, anticoagulant is automatically mixed with the blood as it is pumped from the body into the apheresis machine.[7]
The centrifugation process itself has four variables that can be controlled to selectively remove desired components. The first is spin speed and bowl diameter, the second is "sit time" in centrifuge, the third is solutes added, and the fourth is not as easily controllable: plasma volume and cellular content of the donor. The result in most cases is the classic sedimented blood sample with the RBCs at the bottom, the buffy coat of platelets and WBCs (lymphocytes, granulocytes, monocytes) in the middle and the plasma on top.[8]
There are numerous types of apheresis.
Blood taken from a healthy donor can be separated into its component parts during blood donation, where the needed component is collected and the unharvested components are returned to the donor. Fluid replacement is usually not needed in this type of collection. In many countries, apheresis donors can donate platelets more often than those donating whole blood. There are several categories of component collections:
Two apheresis kit recalls were:
People who do not use a drug that may prevent blood donation, who do not have the risk of the carrier of a disease, and who have suitable vascular structure may be apheresis donors. For apheresis platelet donation the donor's pre platelet count should be above 150 x 10^9/L. For apheresis plasma donation, the donor's total protein level should be greater than 60 g/L. For double red cell apheresis, donors of either gender require a minimum hemoglobin level of 14.0 g/dl.[16]
Apheresis uses plastics and tubing, which come into contact with the blood. The plastics are made of PVC in addition to additives such as a plasticizer, often DEHP. DEHP leaches from the plastic into the blood, and people have begun to study the possible effects of this leached DEHP on donors as well as transfusion recipients.[17]
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. For autoimmune diseases in which apheresis is effective, it is used not as a standalone treatment, but rather in conjunction with therapies that reduce production of autoantibodies.
In 2023,[22] the American Society for Apheresis published the 9th Special Edition of evidence based guidelines for the practice of Apheresis Medicine. These guidelines are based upon a systematic review of available scientific literature. Clinical utility for a given disease is denoted by assignment of an ASFA Category (I – IV). The quality and strength of evidence are denoted by standard GRADE recommendations. ASFA Categories are defined as follows:
Only diseases (or mentioned special conditions thereof) with ASFA category I or II are displayed in bold, with category I being underlined in addition.
Disease | Special condition | ABO-incompatible hematopoietic stem cell transplantation | II | ||
---|---|---|---|---|---|
ABO-incompatible solid organ transplantation | Kidney | II | |||
Heart (<40 months of age) | II | ||||
Liver (perioperative) | III | ||||
Acute disseminated encephalomyelitis | II | ||||
Acute inflammatory demyelinating polyneuropathy | I | ||||
III | |||||
Age-related macular degeneration (AMD) | Dry AMD | III | |||
IV | |||||
IV | |||||
Anti-neutrophil cytoplasmic antibody-associated rapidly progressive glomerulonephritis | Dialysis dependence | III | |||
Diffuse alveolar hemorrhage (DAH) | III | ||||
Dialysis independence | III | ||||
Goodpasture syndrome | Dialysis independence | I | |||
Diffuse alveolar hemorrhage (DAH) | I | ||||
Dialysis dependence and no DAH | III | ||||
Aplastic anemia or pure red cell aplasia | III | ||||
Pure red cell aplasia | II | ||||
Autoimmune hemolytic anemia | III | ||||
Cold agglutinin disease, life-threatening | II | ||||
Babesiosis | Severe | I | |||
High-risk population | II | ||||
IV | |||||
Heart transplant with allograft | Prophylaxis of rejection | I | |||
Treatment of rejection | II | ||||
Treatment of antibody-mediated rejection | I | ||||
Catastrophic antiphospholipid syndrome | I | ||||
Rasmussen's encephalitis | II | ||||
Chronic inflammatory demyelinating polyneuropathy | I | ||||
Coagulation factor inhibitors | III | ||||
III | |||||
Cryoglobulinemia | Severe/symptomatic | II | |||
Secondary to Hepatitis C | II | ||||
Cutaneous T cell lymphoma | Erythrodermic | I | |||
Non-erythrodermic | III | ||||
IV | |||||
IV | |||||
NYHA class II-IV | III | ||||
Familial hypercholesterolemia | Homozygotes | I | |||
Heterozygotes | II | ||||
Homozygotes with small blood volume | II | ||||
Focal segmental glomerulosclerosis | Recurrent | I | |||
Graft-versus-host disease | Skin | II | |||
Non-skin | II | ||||
Hemolytic disease of the fetus and newborn | Before intrauterine transfusion availability | III | |||
III | |||||
Hemolytic–uremic syndrome (HUS) | Atypical HUS due to mutations in complement factor genes | II | |||
Atypical HUS due to factor H autoantibodies | I | ||||
Typical HUS, or diarrhea-associated HUS | III | ||||
Leukocytosis | Leukostasis | III | |||
Prophylaxis of leukostasis | III | ||||
Hyperviscosity in monoclonal gammopathy | Treatment of symptoms | I | |||
Prophylaxis in rituximab | |||||
Immune thrombocytopenic purpura | IV | ||||
III | |||||
IV | |||||
Inflammatory bowel disease | II | ||||
Kidney transplantation | Antibody-mediated rejection | I | |||
Desensitization in living donor in positive crossmatch due to donor specific HLA antibody | I | ||||
High PRA and cadaveric donor | III | ||||
Lambert–Eaton myasthenic syndrome | II | ||||
Lung transplantation | Allograft rejection | II | |||
Malaria | Severe | II | |||
Multiple sclerosis | Acute inflammatory demyelinating diseases of the central nervous system, unresponsive to steroids | II | |||
Chronic progressive | III | ||||
Myasthenia gravis | Moderate to severe | I | |||
Pre-thymectomy | I | ||||
Myeloma cast nephropathy | II | ||||
III | |||||
Neuromyelitis optica | II | ||||
Venoms, poisoning and overdose | Mushroom poisoning | II | |||
Other | III | ||||
Neurologic | III | ||||
III | |||||
Polyneuropathy due to monoclonal gammopathy | IgG, IgA or IgM | I | |||
III | |||||
IgG/IgA or IgM | III | ||||
PANDAS and Sydenham's chorea | I | ||||
IV | |||||
III | |||||
Refsum disease | II | ||||
III | |||||
IV | |||||
III | |||||
IV | |||||
Rheumatoid arthritis | Refractory | II | |||
IV | |||||
Systemic scleroderma | III | ||||
IV | |||||
III | |||||
Sickle cell disease | Acute stroke | I | |||
Acute chest syndrome | II | ||||
Prophylaxis of stroke or transfusional iron overload | II | ||||
III | |||||
IV | |||||
Systemic lupus erythematosus | Severe, such as cerebritis or diffuse alveolar hemorrhage | II | |||
IV | |||||
Thrombocytosis | Symptomatic | II | |||
Prophylactic | III | ||||
Thrombotic microangiopathy, drug-associated | I | ||||
III | |||||
IV | |||||
Thrombotic microangiopathy, hematopoietic stem cell transplantation-related | III | ||||
Thrombotic thrombocytopenic purpura | I | ||||
III | |||||
Wilson's disease | Fulminant hepatic failure with hemolysis | I |
When an apheresis system is used for therapy, the system is removing relatively small amounts of fluid (not more than 10.5 mL/kg body weight). That fluid must be replaced to keep correct intravascular volume. The fluid replaced is different at different institutions. If a crystalloid like normal saline (NS) is used, the infusion amount should be triple what is removed as the 3:1 ratio of normal saline for plasma is needed to keep up oncotic pressure. Some institutions use human serum albumin, but it is costly and can be difficult to find. Routine use of fresh frozen plasma (FFP) is not generally appropriate because of the dangers including citrate toxicity (from the anticoagulant), ABO incompatibility, infection, and allergic reactions. However, FFP should be used in cases of thrombotic thrombocytopenic purpura or patients at high risk of bleeding.