Transfusion related acute lung injury

Transfusion related acute lung injury (TRALI) is a serious complication associated with blood transfusion. It is characterized by acute lung injury that occurs within six hours following a transfusion. TRALI is considered to be a type of pulmonary edema, and is one of the leading causes of death related to transfusion.

Etiology

The exact cause of TRALI is not fully understood, but it is believed to be related to the presence of certain antibodies in the transfused blood. These antibodies can react with the recipient's white blood cells, leading to an inflammatory response in the lungs. In some cases, TRALI may also be caused by the transfusion of blood products that are high in lipids, which can trigger a similar inflammatory response.

Symptoms

The symptoms of TRALI typically appear within 1 to 6 hours after the transfusion. These may include dyspnea (difficulty breathing), hypoxemia (low blood oxygen levels), fever, and hypotension (low blood pressure). In severe cases, TRALI can lead to respiratory failure and death.

Diagnosis

Diagnosis of TRALI is based on clinical symptoms and the timing of their onset in relation to a blood transfusion. Imaging tests, such as a chest X-ray, may also be used to confirm the presence of pulmonary edema. In some cases, blood tests may be performed to identify the presence of specific antibodies.

Treatment

Treatment for TRALI primarily involves supportive care, including oxygen therapy and, in severe cases, mechanical ventilation. The use of corticosteroids is controversial and is generally reserved for severe cases. In most cases, the symptoms of TRALI resolve within 48 to 72 hours.

Prevention

Prevention strategies for TRALI include the use of blood products that are low in plasma and the avoidance of transfusions from donors with known antibodies. Additionally, some blood banks have implemented screening procedures to identify and exclude high-risk donors.