Hematology Oncology · Year 2 · from Hematology Oncology

Case 2: TRALI vs TACO

Patient Presentation

Demographics: 68-year-old male

Chief Complaint: Acute respiratory distress 2 hours after platelet transfusion

History of Present Illness: The patient with acute myeloid leukemia received a platelet transfusion for thrombocytopenia. Two hours later, he developed sudden onset dyspnea, hypoxia, and bilateral crackles. He is now in respiratory distress requiring supplemental oxygen.

Past Medical History:

  • Acute myeloid leukemia on chemotherapy
  • Mild heart failure (EF 45%)
  • Chronic kidney disease stage 3

Two Possible Diagnoses Being Considered:

  • Transfusion-Related Acute Lung Injury (TRALI)
  • Transfusion-Associated Circulatory Overload (TACO)

Workup and Results

Vital Signs:

  • Blood pressure: 165/95 mmHg
  • Heart rate: 110 bpm
  • Temperature: 37.1C
  • SpO2: 82% on room air

Physical Examination:

  • General: Severe respiratory distress
  • Lungs: Diffuse bilateral crackles
  • Cardiac: S3 gallop present
  • JVP: Elevated (12 cm)
  • Lower extremities: 2+ pitting edema

Laboratory Studies:

  • BNP: 1,850 pg/mL (markedly elevated)
  • Troponin: Mildly elevated

Chest X-ray:

  • Bilateral pulmonary infiltrates
  • Cardiomegaly
  • Kerley B lines

Clinical Image

Chest X-ray demonstrating bilateral pulmonary edema. Key distinguishing features for TACO include cardiomegaly, elevated BNP, and hypertension, whereas TRALI typically presents with hypotension and normal BNP.

Diagnosis

Transfusion-Associated Circulatory Overload (TACO)

Distinguishing features supporting TACO over TRALI:

  • Hypertension (TRALI typically hypotensive)
  • Elevated BNP (>1,000 pg/mL suggests TACO)
  • Pre-existing cardiac disease
  • Signs of volume overload (JVP, edema, S3)

Discussion

This case contrasts TACO and TRALI:

  • TACO Mechanism: The lecture describes TACO as cardiogenic pulmonary edema from volume overload. Risk factors include pre-existing cardiac/renal disease and large/rapid transfusion volumes.
  • TRALI Mechanism: The lecture explains TRALI is caused by anti-HLA or anti-neutrophil antibodies in donor plasma activating recipient neutrophils in the lung, causing capillary leak. It is non-cardiogenic pulmonary edema.
  • Key Distinguishing Features: The lecture identifies elevated BNP and hypertension as suggesting TACO, while hypotension suggests TRALI. Both present within 6 hours with bilateral infiltrates and hypoxia.
  • TRALI Mitigation: The lecture notes that excluding plasma from female donors who have been pregnant (higher HLA antibody prevalence) has significantly reduced TRALI incidence.

Treatment Plan

For TACO:

  1. Immediate:
  • Stop or slow transfusion
  • Upright positioning
  • Supplemental oxygen
  • Diuresis (furosemide)
  1. Supportive Care:
  • BiPAP if needed
  • Morphine for dyspnea relief (cautiously)
  1. Prevention for Future Transfusions:
  • Slow infusion rate
  • Diuretic pre-medication
  • Consider smaller volume transfusions

If TRALI:

  1. Stop transfusion immediately
  2. Supportive care (oxygen, mechanical ventilation if needed)
  3. AVOID diuretics (non-cardiogenic)
  4. Report to blood bank for donor evaluation

Teaching Points

  1. TACO: Cardiogenic edema; TRALI: Non-cardiogenic (antibody-mediated)
  2. Elevated BNP and hypertension favor TACO; hypotension favors TRALI
  3. TRALI caused by anti-HLA/anti-neutrophil antibodies in donor plasma
  4. TACO treated with diuretics; TRALI supportive care only
  5. Both present within 6 hours with bilateral infiltrates

All cases for this lecture as Markdown