Washed red blood cells
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Through Red blood cell and Centrifugation
Methods of washing red cells
There are multiple methods of washing red cells. These can include automated or manual methods. They can use centrifugation or centrifugation-free methods. The red cells can be re-suspended in saline or other types of special preservative solutions for red cells, such as SAGM (saline, adenine, glucose and mannitol).
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Medical uses
Prevention of recurrence of severe allergic reactions
The most common reason for using washed red blood cells in transfusion medicine is to prevent the recurrence of severe allergic transfusion reactions. The allergen is usually a protein in the plasma that is removed by the process of washing the red blood cells. Various proteins, such as antibodies directed against IgA or haptoglobin in people with IgA and haptoglobin deficiency, have been suggested to have a causal relationship with the allergic reaction. Cytokines and chemokines, which accumulate during the storage of blood components, have also been suggested as causative agents. However, the literature is scarce and conflicting, as passive infusion of anti-IgA antibodies in to recipients has not been found to cause an allergic reaction.
Reduction in transfusion-related complications
In neonates, transfusion has been associated with an increased risk of serious side effects including:
- Necrotising enterocolitis (NEC)
- Intraventricular haemorrhage (IVH)
- Retinopathy of prematurity (ROP)
- Chronic lung disease (CLD)
- Death
Transfusion-related immune modulation has been thought to be the underlying mechanism. Washing red cells has been thought to be one way of potentially decreasing the risk of theses transfusion-related side-effects. However, in neonates, there is insufficient evidence to say whether washing red cells has any effect.
Storage
Once red blood cells have been washed, they can only be kept for up to a day.