Patient Information for Therapeutic Plasma Exchange (TPE)
What is Therapeutic Plasma Exchange (TPE)?
Blood consists of two main components: plasma and blood cells. Plasma helps transport blood cells and various substances throughout the body. Blood cells include red blood cells, white blood cells, and platelets.
In certain medical conditions, plasma may contain abnormal substances that cause disease. Therapeutic plasma exchange (commonly known as plasma exchange or abbreviated as TPE) is a treatment method that removes a portion of the patient's plasma and replaces it with another fluid, which can be a 5% albumin solution or healthy donor plasma. The patient's blood is drawn out of the body and passes through a specialized filter system designed to separate the plasma from the rest of the blood. The blood is then returned to the body along with the replacement fluid via a plasma exchange machine system.
Plasma exchange helps remove abnormal substances from the patient's blood and alleviates disease symptoms.
What is the purpose of Therapeutic Plasma Exchange?
- Plasma exchange is frequently used to treat certain blood disorders, neurological diseases, or autoimmune conditions. Common indications for plasma exchange include:
Myasthenia gravis
Guillain-Barré syndrome
Acute pancreatitis due to hypertriglyceridemia
Acute liver failure
Thrombotic thrombocytopenic purpura (TTP)
Certain kidney diseases such as Goodpasture's syndrome
- When used alone, plasma exchange cannot cure these conditions, but it helps slow disease progression and reduce symptoms. When combined with other treatments, plasma exchange can increase the body's chances of recovery.
How is Therapeutic Plasma Exchange performed?
Following diagnosis, a physician will prescribe plasma exchange using either human donor plasma or a 5% albumin solution as the replacement fluid and outline a treatment schedule (which may involve a single session or multiple sessions depending on the medical condition). Anticoagulant medications may or may not be used depending on the clinical status.
The patient or the patient's legal representative will receive counseling and sign a consent form.
The physician will insert an intravenous catheter (also known as a dialysis catheter or plasma exchange catheter) into a large vein in the groin or neck area to withdraw blood from the body. This catheter is connected to the plasma exchange machine via a system of tubing.
The patient’s blood flows through the tubing into the plasma exchange machine, where the machine separates the patient's plasma and replaces it with the plasma replacement solution. The blood cells and replacement fluid are then returned to the patient's body.
Each plasma exchange session takes approximately 6 to 8 hours.
Normally, a single plasma exchange filter is required for one session. However, depending on the clinical condition, if the filter clots rapidly, 2 to 3 filters may need to be used during a single procedure.
What are the complications of Therapeutic Plasma Exchange?
Complications can occur during the plasma exchange procedure. The following are some commonly encountered complications:
- General complications:
Hypotension (low blood pressure)
Complications related to catheter insertion: pain, infection, bleeding, venous thrombosis, accidental arterial puncture
Hypocalcemia (low blood calcium) if citrate is used as an anticoagulant
Metabolic alkalosis caused by citrate, which may lead to headaches or seizures
- When using human donor plasma as the replacement fluid:
Anaphylactic reactions
Urticaria (hives)
Transfusion-related acute lung injury (TRALI)
Transmission of infectious diseases from donor plasma
- When using 5% albumin solution as the replacement fluid:
Hypokalemia (low blood potassium)
Hypocalcemia (low blood calcium)
Reduction in coagulation factors
Higher risk of infection due to the removal of normal immune system antibodies
Allergic and anaphylactic reactions are less common when using albumin compared to human plasma.
The information above is for reference purposes only and is not intended as medical advice. Please contact your doctor for detailed medical consultation.