Transfusion-Related Acute Lung Injury (TRALI) Diagnosis and Management
Mechanism and Clinical Presentation
- The American Society of Anesthesiologists recommends that pulmonary congestion developing 30 minutes after transfusion is most likely caused by anti-leukocyte antibodies, representing Transfusion-Related Acute Lung Injury (TRALI), not cytokines 1
- The mechanism of TRALI involves donor anti-leukocyte antibodies (HLA class I, class II, or granulocyte-specific antibodies) in plasma-containing blood components interacting with antigens on the patient's granulocytes, causing granulocyte aggregation and complement activation in lung capillaries 3
- The clinical presentation of TRALI includes fever, hypoxemia, acute respiratory distress, and increased peak airway pressure occurring within 6 hours after transfusion 3
Differential Diagnosis
- The American College of Physicians suggests that Transfusion-Associated Circulatory Overload (TACO) typically causes cardiogenic pulmonary edema from fluid overload rather than the non-cardiogenic pulmonary edema seen in TRALI 2
- TACO can occur during or up to 12 hours after transfusion, but is distinguished by cardiovascular changes and evidence of fluid overload 2
Diagnostic Features
- The presence of hypoxemia with dyspnea developing acutely during or immediately after transfusion is a critical diagnostic feature of TRALI 1
- Hypotension rather than hypertension, which would suggest TACO, is also a key diagnostic feature 1
- Fever accompanying the respiratory distress is a common symptom of TRALI 3, 2
Management
- The American Society of Anesthesiologists recommends stopping the transfusion immediately and maintaining IV access with normal saline in cases of suspected TRALI 1, 2
- Administering 100% oxygen to address severe hypoxemia is also recommended 1
- Avoiding diuretics, which are ineffective and potentially harmful in TRALI, is crucial 1, 2