Apheresis – A Transfusion Procedure

Apheresis is a medical procedure that involves removing whole blood from a patient or donor and separating it into individual components so that one particular component can be removed or modified.

The remaining components are then returned to the bloodstream. This procedure is versatile and has several applications, from therapeutic treatments to blood donation processes.

Types of Apheresis

Apheresis can be classified based on the type of component being separated and collected:

1.Plasmapheresis

Plasmapheresis involves the removal, treatment, and return or exchange of plasma, the liquid part of blood. It is often used to treat autoimmune diseases, where harmful antibodies in the plasma may be causing disease.

2.Plateletpheresis

This type of apheresis is used to collect platelets from a donor. Platelets are crucial for blood clotting, and this procedure is commonly used to supply platelets to patients with conditions like leukemia or those undergoing chemotherapy.

3.Leukapheresis

Leukapheresis is the process of removing white blood cells from the blood. This can be done to collect cells for donation or to reduce a high white blood cell count in patients with conditions such as leukemia.

4.Erythrocytapheresis

Also known as red cell exchange, erythrocytapheresis involves the removal of red blood cells and is used primarily to treat conditions like sickle cell anemia.

5.Lipidpheresis

This is a lesser-known type of apheresis that targets and removes lipids (fats) from the blood. It is used in cases of severe hyperlipidemia that do not respond to medication.

Procedure

The apheresis procedure typically involves the following steps:

• Blood is drawn from the patient or donor through a needle inserted into a vein.
• The blood is passed through a machine that separates it into its components using centrifugation or filtration.
• The desired component is collected in a bag or container.
• The remaining components are combined and returned to the patient or donor.

Applications of Apheresis

Apheresis has a wide range of applications in both therapeutic and donation settings.

Therapeutic Apheresis

In therapeutic apheresis, a component of the patient’s blood that is thought to contribute to a disease state is removed. Conditions treated with therapeutic apheresis include:

• Guillain-Barré syndrome
• Myasthenia gravis
• Multiple sclerosis
• Thrombotic thrombocytopenic purpura (TTP)
• Hyperviscosity syndromes

Donor Apheresis

Apheresis is also used to collect specific blood components from donors. This is often more efficient and targeted than whole blood donations. For example:

• Platelet donations can be made every two weeks, whereas whole blood donations are typically every 8 weeks.
• Plasma donations can help treat patients with clotting disorders.

Benefits and Risks

Like any medical procedure, apheresis has both benefits and risks.

Benefits

• Targeted treatment: Apheresis can be used to specifically remove harmful components from the blood.
• Lower risk of transfusion reactions: By collecting specific components, the risk of adverse reactions can be minimized.
• Frequent donations: Donors can give more frequently when only specific components are collected.

Risks

• Bleeding and bruising: The needle insertion can cause bleeding, bruising, or infection.
• Hypocalcemia: Some apheresis procedures use anticoagulants that can bind calcium, leading to temporary low calcium levels.
• Allergic reactions: Rarely, patients may have allergic reactions to the materials used in the apheresis machine.
• Fatigue: Some donors and patients may feel tired after the procedure.

Complications of apheresis

Serious complications of donor apheresis are rare. Minor complications of donor apheresis can include bleeding at the donation site and feelings of lightheadedness that usually resolve quickly.

More serious complications can occur when apheresis is used to treat serious conditions, which include:

• Bleeding and a tendency to bleed (because clotting factors are removed)
• Infection and a tendency toward infection (because the immune system is somewhat suppressed when antibodies are removed)
• Low blood pressure (as fluids are removed)
• Muscle cramping (as low blood calcium can occur and other electrolytes can be imbalanced)

Future of Apheresis

Advancements in technology and medical research continue to expand the applications and efficacy of apheresis. Emerging areas of interest include:

• Stem cell collection: Apheresis is used to collect stem cells for transplantation in patients with certain cancers and blood disorders.
• Gene therapy: Researchers are exploring ways to modify cells collected through apheresis for gene therapy applications.
• Immunotherapy: Apheresis is being used to collect and modify immune cells to treat cancer and other diseases.

Nursing Care of Patients Undergoing Apheresis

Apheresis is a medical procedure that involves removing blood from a patient or donor, separating it into various components, and returning the remainder to the individual. This procedure is used to treat a variety of conditions, including blood disorders, autoimmune diseases, and for the collection of specific blood components for transfusion or research purposes. Given the complexity and potential risks associated with apheresis, nursing care plays a critical role in ensuring patient safety and comfort.

Pre-Procedure Care

Patient Assessment

Before the apheresis procedure, a thorough patient assessment is crucial. This includes:

• Evaluating the patient’s medical history and current medications to identify any potential contraindications or risks.
• Conducting a physical examination to assess the patient’s overall health status.
• Reviewing laboratory results, especially platelet counts, hemoglobin levels, and calcium levels.
• Assessing the patient’s psychological readiness and providing reassurance and education about the procedure.

Patient Education

Educating the patient about the apheresis procedure is essential to alleviate anxiety and ensure cooperation. Key points to cover include:

• The purpose and process of apheresis.
• Potential risks and complications such as bleeding, bruising, hypocalcemia, allergic reactions, and fatigue.
• Instructions for pre-procedure preparation, such as fasting or hydration requirements.
• Post-procedure care and activity restrictions.

During the Procedure

Monitoring and Support

Nurses must closely monitor the patient throughout the apheresis procedure to detect and manage any complications. This includes:

• Keeping track of vital signs, including blood pressure, heart rate, and temperature.
• Observing the insertion site for signs of bleeding, bruising, or infection.
• Monitoring for symptoms of hypocalcemia, such as tingling, muscle cramps, or confusion, and administering calcium supplements if needed.
• Watching for signs of allergic reactions, such as hives, rash, or difficulty breathing, and being prepared to administer antihistamines or other medications.

Patient Comfort

Ensuring patient comfort during apheresis is vital for a positive experience. Nurses can:

• Provide blankets and pillows to keep the patient warm and comfortable.
• Offer distractions, such as television, music, or conversation, to help pass the time.
• Encourage the patient to report any discomfort or unusual sensations immediately.

Post-Procedure Care

Observation and Recovery

After the procedure, nurses should continue to monitor the patient for any delayed complications and ensure a smooth recovery. Key steps include:

• Checking vital signs and the insertion site for signs of bleeding or infection.
• Assessing the patient for symptoms of hypocalcemia or other adverse reactions.
• Providing fluids and snacks to help the patient regain energy and prevent fatigue.

Patient Instructions

Providing clear post-procedure instructions to the patient is crucial for preventing complications and promoting recovery. These instructions may include:

• Avoiding strenuous activities for a specified period to prevent bleeding or bruising.
• Monitoring the insertion site for signs of infection and reporting any concerns to the healthcare provider.
• Maintaining adequate hydration and nutrition to support recovery.
• Knowing when and how to take any prescribed medications, such as calcium supplements.

Special Considerations

Stem Cell Collection

For patients undergoing apheresis for stem cell collection, additional considerations include:

• Monitoring for side effects of medications used to mobilize stem cells, such as bone pain or fever.
• Ensuring the patient understands the importance of follow-up appointments and lab tests.

Gene Therapy and Immunotherapy

In cases where apheresis is used for gene therapy or immunotherapy, nurses should be aware of the specific protocols and potential complications associated with these treatments. This may involve:

• Coordinating with a multidisciplinary team to ensure appropriate care and follow-up.
• Educating the patient about the goals and potential outcomes of the therapy.

REFERENCES

1. American Society for Apheresis. ASFA Patient Resource Information Sheets (https://pubmed.ncbi.nlm.nih.gov/32892844/). Updated 7/19/2023.
2. Szczepiorkowski ZM. Indications for therapeutic apheresis in hematologicaldisorders. (https://pubmed.ncbi.nlm.nih.gov/32892844/) Semin Hematol. 2020 Apr;57(2):57-64.
3. Vrielink H, Neyrinck MM. Basics of apheresis and equipment (https://pubmed.ncbi.nlm.nih.gov/36870905/). Transfus Apher Sci. 2023 Apr;62(2):103671.
4. Fridey, Joy L., M.D. “Therapeutic aphresis (plasma exchange or cytapheresis): Indications and technology.” UptoDate. Updated Jul. 29, 2015 http://www.uptodate.com/contents/therapeutic-apheresis-plasma-exchange-or-cytapheresis-indications-and-technology?source=search_result&search=Therapeutic+plasma+exchange%3A+Indications&selectedTitle=1~150
5.  Connelly-Smith L, Alquist CR, Aqui NA, et al. 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. J Clin Apher 2023;38(2):77-278. doi:10.1002/jca.22043

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