TRALI vs TACO in a Postoperative Transfusion Reaction
A 71-year-old woman with chronic kidney disease (baseline creatinine 2.1 mg/dL, ejection fraction 40%) undergoes hip surgery and receives 2 units of RBCs over 3 hours for a hemoglobin of 7.0 g/dL. Two hours after the second unit she develops dyspnea, hypoxemia (SpO2 88% on room air), bilateral infiltrates on chest x-ray, and a blood pressure of 165/95 mmHg. She has jugular venous distension and a positive fluid balance of +2.5 L. Her temperature is 37.2°C. BNP is 900 pg/mL. The blood bank is asked whether this is TRALI or TACO and what to do.
1. Differentiate TRALI from TACO in this patient using the clinical and laboratory findings.
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This is most consistent with TACO (transfusion-associated circulatory overload). Supporting features:
- Hypertension (165/95) - TACO typically causes hypertension; TRALI often causes hypotension.
- JVD and positive fluid balance (+2.5 L) - volume overload.
- Elevated BNP (900) - supports cardiogenic pulmonary edema; TRALI typically has normal/low BNP.
- Underlying risk: CKD, reduced EF (40%), age 71, and 2 units over 3 hours (rate ~1 unit/1.5 h) in a patient with limited cardiac reserve.
- Fever absent (37.2°C) - TRALI often has fever; TACO usually does not.
TRALI would typically present with hypotension, fever, no JVD, normal BNP, and bilateral infiltrates within 6 hours without volume overload. TRALI is a diagnosis of exclusion and requires no other cause of ARDS.
Caveat: Both can coexist; the findings here favor TACO but TRALI cannot be excluded without further data. The blood bank should still evaluate for TRALI per hemovigilance criteria (imputability, donor history) while treating volume overload.
2. What immediate management and reporting steps should be taken, and how should future transfusions be modified?
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Immediate management:
- Stop the transfusion (if still running) and maintain IV access.
- Sit the patient upright, give oxygen, and consider diuretics (furosemide) for volume overload.
- Monitor vitals, urine output, and oxygenation; consider noninvasive ventilation if worsening.
- Do not treat as TRALI with aggressive fluids; the priority is unloading volume.
Reporting:
- Report as a suspected transfusion reaction to the blood bank; complete the reaction workup (clerical check, hemolysis screen, and, if TRALI is considered, donor HLA/HNA antibody evaluation and recipient HLA typing per institutional protocol).
- Report to the hospital hemovigilance system and, if TRALI is confirmed, to the blood supplier for donor deferral evaluation.
Future transfusions:
- Slow the rate (e.g., 1 mL/kg/h or slower) and consider single-unit transfusions with reassessment.
- Premedicate with diuretic if volume overload risk persists.
- Use restrictive transfusion thresholds and consider leukoreduced products (standard) - note that leukoreduction reduces but does not eliminate TRALI.
- Document TACO risk in the chart and flag for future orders.