Plasma exchange (plasmapheresis) is a procedure which separates your blood into its different parts: red cells, white cells, platelets and plasma. The plasma is removed from the blood and replaced by a plasma substitute.
Plasma cells are a type of white blood cell. In conditions such as myeloma and Waldenström’s macroglobulinaemia, which is a rare type of lymphoma, abnormal plasma cells may make large amounts of a protein called immunoglobulin.
Very high levels of immunoglobulin in the blood can cause it to become thicker than normal. This can cause symptoms such as headaches, blurred vision and tiredness (fatigue). It is sometimes called hyperviscosity syndrome.
Plasma exchange can reduce the amount of abnormal protein in the blood. However, it does not stop the protein being produced. Other treatments, such as chemotherapy, are needed to reduce the production of the protein by the plasma cells.
People with acute myeloid leukaemia or chronic myeloid leukaemia may sometimes have a very high number of abnormal white cells in their blood. They can be treated using leukapheresis, which is a similar procedure to plasma exchange. During leukapheresis, the white cells are removed instead of the plasma.
Plasma exchange is done using a machine called a cell separator, which separates blood cells and plasma.
A short, thin tube (a cannula) is put into a vein in each arm. Blood is taken from one of your arms and circulated through the cell separator. This spins the blood to separate the plasma from the blood cells so that the plasma can be removed. The rest of your blood is then mixed with a plasma substitute and returned to you through the vein in your other arm.
During plasma exchange, only a small amount (less than 100ml) of blood is outside your body at any time. This is because blood is being removed and returned at the same rate.
Each plasma exchange takes about 2 hours. The rate of plasma exchange is decided according to your height, weight and the thickness (viscosity) of your blood.
The number of plasma exchanges that you need will depend on the amount of protein in your blood, your symptoms and your response to other treatments such as chemotherapy.
Feeling faint or light-headed
Occasionally you might feel faint or light-headed during plasma exchange. If this happens, tell your nurse or doctor immediately. It’s usually easy to treat by changing your position so that you are lying down. You may be given additional fluid into the vein.
Try to eat breakfast and lunch on the day of treatment as this can help to reduce your chances of feeling faint.
Tell your doctor if you take tablets to help control your blood pressure. They may ask you to stop taking them temporarily.
Numbness and tingling
You may feel numbness or tingling around your mouth and nose, or in your fingers, during the treatment. This is a side effect of a substance called citrate. Citrate is mixed with your blood to stop it clotting while it is outside your body. If the amount of citrate builds up, it can temporarily lower the levels of calcium in your blood and cause the above symptoms.
Let the nurse or doctor know straight away if you feel numbness or tingling sensations. It's easy to treat them by giving you a milky drink or calcium tablets, or by pausing the plasma exchange for five minutes. This is usually enough time for your body to readjust to the effects of citrate and for the symptoms to go away.
You may be given a calcium tablet before starting plasma exchange if the amount of calcium in your blood is slightly low.
Rarely, plasma exchange may cause an allergic reaction. Your nurse will check you for this. If you have a reaction, they will treat it quickly. Signs of an allergic reaction can include:
- a rash
- feeling itchy
- feeling short of breath
- fever and chills.
Tell the nurse straight away if you notice any of these symptoms. The plasma exchange may be stopped while the reaction is treated.
Talk to your nurse or doctor about any concerns
If anything is worrying you about the procedure, speak to the nurse or doctor giving you the treatment as they may be able to help. For example, if you are anxious about needles, it may be possible to have a local anaesthetic cream to numb the skin where the needles are put in.
Tell your doctor about any medications you are taking
Some medicines can affect plasma exchange. Let your doctor or nurse know about any medications you are taking, including non-prescribed drugs such as complementary therapies and herbal drugs.
Take a relative or friend with you, or a book or tablet
You may want to bring in magazines, a tablet or a book to help pass the time. You can usually have a relative or friend with you during the procedure.
Visit the toilet before treatment starts
Once plasma exchange begins, it is difficult to move around, so you may want to go to the toilet before the treatment starts.
Drink plenty of water
Drinking plenty of fluids (2 to 3 litres) on the day of the treatment will help to replace any fluid that you may have lost during the procedure. You may also want to avoid alcohol for the rest of the day, as its effect on the body will be stronger than usual.
Rest after your treatment and avoid driving home
People often feel very tired after the procedure and you may feel tired for the rest of the day. It is best to rest afterwards and avoid any strenuous activity. It is also a good idea to arrange someone to take you home after treatment, rather than drive home yourself.