Nephrology focuses on diagnosing and treating kidney diseases. The kidneys filter waste, balance fluids, regulate blood pressure, and manage acute and chronic conditions.
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Therapeutic apheresis is a specialized medical procedure that involves removing blood from the body, separating it into its individual components, removing a specific component that is causing illness, and then returning the remaining blood to the body. While the name sounds complex, the concept is quite similar to donating blood, but with a few extra steps designed to treat specific medical conditions. This therapy is used when a part of your blood—such as the plasma, white blood cells, or red blood cells—contains something harmful or is present in excessive amounts. By removing just that specific part, doctors can help alleviate symptoms of various diseases, ranging from autoimmune disorders to blood abnormalities.
The process is performed using a specialized machine that acts as a filter and separator. It is a controlled and safe environment where your comfort and health are the primary focus. For many patients, therapeutic apheresis is a lifeline that helps manage chronic conditions or addresses acute medical crises. It is important to understand that the treatment is a supportive therapy; it often works in conjunction with other treatments like medication to help the body heal or maintain stability. Understanding how this process works can help reduce anxiety and prepare you for what to expect during your course of treatment. This section will explore the fundamental definition of the therapy, how the machinery operates, and the different reasons a physician might recommend this course of action.
At its core, therapeutic apheresis is about cleaning or balancing the blood. Your blood is made up of four main parts: red blood cells, white blood cells, platelets, and plasma. Plasma is the liquid part that carries the cells and various proteins throughout the body. Sometimes, disease processes occur because one of these components is carrying harmful substances, such as antibodies that attack your body, or because there are simply too many of a certain type of cell.
The procedure is often compared to dialysis, which is used for kidney failure. While both involve filtering blood outside the body, they target different things. Dialysis removes chemical waste products from the blood, a function that the kidneys are unable to perform. Apheresis targets specific blood components. During the session, blood is drawn from a vein, usually in the arm. It flows into a machine that acts like a centrifuge. This machine spins the blood to separate the heavy cells from the lighter plasma. Depending on your specific condition, the machine removes the “bad” part and returns the “good” parts to you, often mixing them with a replacement fluid to keep your blood volume stable.
It is very common for patients to confuse therapeutic apheresis with dialysis, but they are distinct treatments for different purposes. Dialysis is specifically for people whose kidneys have stopped working. It focuses on removing small waste particles and excess water that accumulate when the kidneys fail. The machine used in dialysis acts as an artificial kidney.
Therapeutic apheresis, on the other hand, is not typically used for kidney failure. It is used for a much wider variety of conditions, including neurological disorders, blood cancers, and cholesterol problems. The machine used in apheresis separates blood by weight and density, not just by chemical filtration.
There are several different types of apheresis, named according to what is being removed from the blood. Your doctor will choose the specific type based on your diagnosis. The most common type is plasmapheresis, also known as plasma exchange. In this procedure, the liquid plasma is removed because it contains harmful antibodies or proteins. It is then replaced with donor plasma or a safe protein solution called albumin.
Another major category is cytapheresis, which involves the removal of specific blood cells. If a patient has too many white blood cells, often due to leukemia, they might undergo leukocytapheresis. If they have too many platelets, which can cause dangerous clotting, they undergo thrombocytapheresis. In cases of sickle cell disease, erythrocytapheresis is used to remove defective red blood cells and replace them with healthy donor cells. This helps improve oxygen delivery and prevents complications.
A specialized form of this treatment is called extracorporeal photopheresis. This is a unique two-step process. First, white blood cells are separated from the blood. Then, while they are outside the body, they are treated with a medication that makes them sensitive to light, followed by exposure to ultraviolet light. These treated cells are then returned to the body. This process helps “retrain” the immune system and is often used for skin lymphomas or to prevent organ rejection after a transplant.
The machine used for this therapy is a sophisticated piece of medical technology designed for safety and precision. It consists of pumps, tubing, and a centrifuge bowl or membrane. The entire system is closed, meaning your blood never comes into contact with the machine parts directly; it stays inside sterile, disposable tubing kits that are used only once for you and then discarded.
The machine monitors your blood flow, pressure, and fluid balance continuously. It has sensors that detect even the tiniest bubbles of air or changes in pressure, automatically stopping the pump if anything is amiss. This ensures that the procedure is not only effective but also extremely safe. The nurse operating the machine stays by your side the entire time, making adjustments to the settings to ensure the separation of blood components is happening efficiently. The technology allows for a continuous flow, so only a small amount of blood is outside your body at any given moment.
Therapeutic apheresis is prescribed for a diverse group of patients. It is a cornerstone treatment for many autoimmune diseases. In these conditions, the immune system mistakenly attacks healthy body tissue by producing harmful antibodies. Removing these antibodies from the plasma can stop the attack and allow the body to recover. This kind of recovery is common in neurological conditions where the nerves are being attacked.
It is also vital for patients with certain metabolic disorders. For example, some people have a genetic condition that causes dangerously high cholesterol levels that diet and medication cannot fix. Apheresis can physically filter the “bad” cholesterol (LDL) out of the blood. Additionally, it serves as a critical support for patients who have received organ transplants. If the body starts to reject a new kidney or heart, apheresis can remove the antibodies causing the rejection, saving the transplanted organ.
The body is remarkably resilient and adapts well to therapeutic apheresis. Because only a small volume of blood is out of the body at one time, the heart and circulation usually remain stable. However, the body does notice the removal of fluids. This is why replacement fluids are used. If plasma is removed, it is replaced with a fluid that mimics its natural properties to keep blood pressure steady.
The body also has a natural ability to regenerate the components that are removed. If plasma is removed, the liver begins working to produce new, healthy proteins to replace those that were lost. If cells are removed, the bone marrow is stimulated to produce new blood cells. The therapy aims to eliminate harmful elements faster than the body can replicate them, thereby shifting the balance towards health and enabling medications to take over for long-term control.
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It depends on your specific condition. It could be the liquid plasma containing harmful antibodies, excess white blood cells, defective red blood cells, or bad cholesterol.
No, but it is related. In a transfusion, you only receive blood. In apheresis, your blood is taken out, processed to remove a specific part, and then returned to you, sometimes with donor fluid added.
No. The machine only holds a small cup’s worth of blood at any single moment. The rest of your blood remains inside your body, circulating normally.
Most sessions last between two and four hours. The exact time depends on your body size, the amount of blood being processed, and the speed of your blood flow.
The procedure itself is not painful. You may feel a slight pinch when the needles are inserted, similar to a blood draw, but the filtering process is painless.
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