Allergic transfusion reaction

Allergic Transfusion Reaction is a type of adverse reaction that can occur during or after a blood transfusion. It is an immunologic reaction that happens when the recipient's immune system reacts against plasma proteins or other substances in the transfused blood. These reactions are generally mild but can occasionally be severe, leading to more serious conditions such as anaphylaxis.

Causes

Allergic transfusion reactions are primarily caused by the presence of allergens in the transfused blood. These allergens can induce an immune response in the recipient, leading to the production of antibodies that react with the allergens. The reaction is often associated with plasma proteins in the donor blood, but it can also be triggered by other substances.

Symptoms

Symptoms of an allergic transfusion reaction can vary from mild to severe and may include:

• Hives or urticaria
• Itching
• Flushing
• Swelling of the face, lips, or throat
• Respiratory distress
• Anaphylaxis (in severe cases)

Diagnosis

Diagnosis of an allergic transfusion reaction involves a clinical assessment of the symptoms and the timing of their appearance relative to the transfusion. Laboratory tests may also be conducted to identify specific antibodies or to rule out other types of transfusion reactions.

Treatment

Treatment for an allergic transfusion reaction typically involves stopping the transfusion and administering antihistamines to relieve the symptoms. In cases of severe reaction, such as anaphylaxis, more aggressive treatments, including epinephrine and corticosteroids, may be necessary. It is also important to manage the patient's airway and breathing if they are compromised.

Prevention

Preventing allergic transfusion reactions involves careful screening of donor blood for potential allergens and matching blood types as closely as possible. For patients with a history of allergic reactions to transfusions, premedication with antihistamines or corticosteroids may be recommended before future transfusions.

See Also

• Blood transfusion
• Transfusion reaction
• Anaphylaxis
• Immunology