Apheresis Explained

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]

Method

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

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

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]

Centrifugation variables

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]

Types

There are numerous types of apheresis.

Donation

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:

Donor safety

Kit problems

Two apheresis kit recalls were:

Donor selection

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]

Plasticizer exposure

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]

Therapy

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.

Indications

ASFA categories

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:

Diseases and disorders

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 conditionABO-incompatible hematopoietic stem cell transplantationII
ABO-incompatible solid organ transplantationKidneyII
Heart (<40 months of age)II
Liver (perioperative) III
Acute disseminated encephalomyelitisII
Acute inflammatory demyelinating polyneuropathyI
III
Age-related macular degeneration (AMD) Dry AMD III
IV
IV
Anti-neutrophil cytoplasmic antibody-associated rapidly progressive glomerulonephritisDialysis dependenceIII
Diffuse alveolar hemorrhage (DAH)III
Dialysis independence III
Goodpasture syndromeDialysis independenceI
Diffuse alveolar hemorrhage (DAH)I
Dialysis dependence and no DAH III
Aplastic anemia or pure red cell aplasiaIII
Pure red cell aplasia II
Autoimmune hemolytic anemiaIII
Cold agglutinin disease, life-threateningII
BabesiosisSevereI
High-risk populationII
IV
Heart transplant with allograftProphylaxis of rejectionI
Treatment of rejectionII
Treatment of antibody-mediated rejectionI
Catastrophic antiphospholipid syndromeI
Rasmussen's encephalitisII
Chronic inflammatory demyelinating polyneuropathyI
Coagulation factor inhibitors III
III
CryoglobulinemiaSevere/symptomaticII
Secondary to Hepatitis CII
Cutaneous T cell lymphoma

mycosis fungoides or Sézary disease

ErythrodermicI
Non-erythrodermic III
IV
IV
NYHA class II-IV III
Familial hypercholesterolemiaHomozygotesI
HeterozygotesII
Homozygotes with small blood volumeII
Focal segmental glomerulosclerosisRecurrentI
Graft-versus-host diseaseSkinII
Non-skin II
Hemolytic disease of the fetus and newbornBefore intrauterine transfusion availabilityIII
III
Hemolytic–uremic syndrome (HUS)Atypical HUS due to mutations in complement factor genesII
Atypical HUS due to factor H autoantibodiesI
Typical HUS, or diarrhea-associated HUS III
LeukocytosisLeukostasisIII
Prophylaxis of leukostasis III
Hyperviscosity in monoclonal gammopathyTreatment of symptomsI
Prophylaxis in rituximab
Immune thrombocytopenic purpura IV
III
IV
Inflammatory bowel diseaseII
Kidney transplantationAntibody-mediated rejectionI
Desensitization in living donor in positive crossmatch due to donor specific HLA antibodyI
High PRA and cadaveric donor III
Lambert–Eaton myasthenic syndromeII
Lung transplantationAllograft rejectionII
MalariaSevereII
Multiple sclerosisAcute inflammatory demyelinating diseases of the central nervous system, unresponsive to steroidsII
Chronic progressive III
Myasthenia gravisModerate to severeI
Pre-thymectomyI
Myeloma cast nephropathyII
III
Neuromyelitis opticaII
Venoms, poisoning and overdoseMushroom poisoning II
Other III
Neurologic III
III
Polyneuropathy due to monoclonal gammopathyIgG, IgA or IgMI
III
IgG/IgA or IgM III
PANDAS and Sydenham's choreaI
IV
III
Refsum diseaseII
III
IV
III
IV
Rheumatoid arthritisRefractoryII
IV
Systemic sclerodermaIII
IV
III
Sickle cell diseaseAcute strokeI
Acute chest syndrome II
Prophylaxis of stroke or transfusional iron overloadII
III
IV
Systemic lupus erythematosusSevere, such as cerebritis or diffuse alveolar hemorrhageII
IV
ThrombocytosisSymptomaticII
Prophylactic III
Thrombotic microangiopathy, drug-associated I
III
IV
Thrombotic microangiopathy, hematopoietic stem cell transplantation-relatedIII
Thrombotic thrombocytopenic purpuraI
III
Wilson's diseaseFulminant hepatic failure with hemolysisI

Fluid replacement during apheresis

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.

See also

External links

Notes and References

  1. Book: Katherine, Abel. Official CPC Certification Study Guide. American Medical Association. 2013. 128.
  2. Fuchs K, Rummler S, Ries W, Helmschrott M, Selbach J, Ernst F, Morath C, Gauly A, Atiye S, Stauss-Grabo M, Giefer M. Performance, clinical effectiveness, and safety of immunoadsorption in a wide range of indications. Ther Apher Dial. 2022 Feb;26(1):229-241. doi: 10.1111/1744-9987.13663. Epub 2021 May 6. PMID: 33914397; PMCID: PMC9291474
  3. Hirano R, Namazuda K, Hirata N. Double filtration plasmapheresis: Review of current clinical applications. Ther Apher Dial. 2021 Apr;25(2):145-151. doi: 10.1111/1744-9987.13548. Epub 2020 Aug 6. PMID: 32558286.
  4. Lambert C, Gericke M, Smith R, Hermans C. Plasma extraction rate and collection efficiency during therapeutic plasma exchange with Spectra Optia in comparison with Haemonetics MCS+. J Clin Apher. 2011;26(1):17-22. doi: 10.1002/jca.20271. Epub 2010 Nov 17. PMID: 21312255.
  5. US . 7108672. patent. Extracorporeal blood processing methods and apparatus .
  6. Web site: Apheresis . 2022-10-24 . en.
  7. Vurro F, Merolle L, Marraccini C, Parisi M, Canovi L, Erta B, Santachiara A, Bonvicini L, Giorgi Rossi P, Baricchi R, Pertinhez TA. Quantitative assessment of the anticoagulant in plasma units collected by plasmapheresis. Transfusion. 2019 Jun;59(6):2113-2120. doi: 10.1111/trf.15244. Epub 2019 Mar 15. PMID: 30875439.
  8. Vrielink H, Neyrinck MM. Basics of apheresis and equipment. Transfus Apher Sci. 2023 Apr;62(2):103671. doi: 10.1016/j.transci.2023.103671. Epub 2023 Feb 24. PMID: 36870905.
  9. http://www.cc.nih.gov/dtm/dtm_double_red_cell.htm dtm double red cell
  10. Lodermeier MA, Byrne KM, Flegel WA. Red blood cell sedimentation of Apheresis Granulocytes. Transfusion. 2017 Oct;57(10):2551-2552. doi: 10.1111/trf.14251. Epub 2017 Aug 16. PMID: 28815621; PMCID: PMC5656404.
  11. Yamanaka, I., Yamauchi, T., Henzan, T. et al. Optimization of lymphapheresis for manufacturing autologous CAR-T cells. Int J Hematol 114, 449–458 (2021). https://doi.org/10.1007/s12185-021-03191-x
  12. Vrielink H, Neyrinck MM. Basics of apheresis and equipment. Transfus Apher Sci. 2023 Apr;62(2):103671. doi: 10.1016/j.transci.2023.103671. Epub 2023 Feb 24. PMID: 36870905.
  13. 10.1002/jca.2920020112 . Apheresis donor safety – changes in humoral and cellular immunity . 1984 . Strauss . Ronald G. . Journal of Clinical Apheresis . 2 . 68–80 . 6536660 . 1. 25890912 .
  14. Web site: Recall of Amicus Apheresis Kits, Baxter Healthcare Corporation . . 2008-12-20 . dead . https://web.archive.org/web/20090117033956/https://www.fda.gov/cber/recalls/baxaphe013105.htm . 2009-01-17 . "Recall of Amicus Apheresis Kits, Baxter Healthcare Corporation", US FDA, Jan 31 2005
  15. Web site: Recall of CS3000 Apheresis Kits. June 21, 2007. Food and Drug Administration.
  16. Boulton F. The 13% rule. Comments. Transfusion Today, 2007, 71:7–9.
  17. Larsson L, Sandgren P, Ohlsson S, Derving J, Friis-Christensen T, Daggert F, Frizi N, Reichenberg S, Chatellier S, Diedrich B, Antovic J, Larsson S, Uhlin M. Non-phthalate plasticizer DEHT preserves adequate blood component quality during storage in PVC blood bags. Vox Sang. 2021 Jan;116(1):60-70. doi: 10.1111/vox.12982. Epub 2020 Sep 12. PMID: 32918773.
  18. 10.1007/s00204-005-0004-x . Intravenous exposure to di(2-ethylhexyl)phthalate (DEHP): Metabolites of DEHP in urine after a voluntary platelet donation . 2005 . Koch . Holger M. . Bolt . Hermann M. . Preuss . Ralf . Eckstein . Reinhold . Weisbach . Volker . Angerer . Jürgen . Archives of Toxicology . 79 . 12 . 689–93 . 16059725. 743051 .
  19. 10.1046/j.1537-2995.2003.00479.x . Donor exposure to the plasticizer di(2-ethylhexyl)phthalate during plateletpheresis . 2003 . Buchta . Christoph . Bittner . Claudia . Höcker . Paul . Macher . Maria . Schmid . Rainer . Seger . Christoph . Dettke . Markus . 34539126 . Transfusion . 43 . 8 . 1115–20 . 12869118.
  20. 10.1016/j.ijheh.2005.07.001 . Di(2-ethylhexyl)phthalate (DEHP) exposure of voluntary plasma and platelet donors . 2005 . Koch . Holger M. . Angerer . Jürgen . Drexler . Hans . Eckstein . Reinhold . Weisbach . Volker . International Journal of Hygiene and Environmental Health . 208 . 6 . 489–98 . 16325559.
  21. Web site: Lipoprotein (a) . CDC Office of Science (OS), Office of Genomics and Precision Public Health . 5 July 2022 . . 14 September 2022.
  22. Connelly-Smith . Laura . Alquist. Caroline. Aqui. Nicole. Hofmann. Jan. Klingel. Reinhard. Onwuemene . Oluwatoyosi. Patriquin. Christopher . Pham. Huy. Sanchez. Amber. Schneiderman. Jennifer. Witt. Volker. Zantek. Nicole. Dunba. Nancy . 5 . 2023 . Guidelines on the Use of Therapeutic Apheresis in Clinical Practice - Evidence-Based Approach from the Writing Committee of the American Society for Apheresis: The Ninth Special Issue. . The Journal of Clinical Apheresis . 38 . 2 . 77-278 . 10.1002/jca.22043 . 37017433 .