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Dr. Tareq Abadl: How to Tell When a Transfusion Suddenly Goes Wrong
Dr. Tareq Abadl/LinkedIn
Dec 18, 2025, 13:34

Dr. Tareq Abadl: How to Tell When a Transfusion Suddenly Goes Wrong

Dr. Tareq Abadl, Medical Laboratory Specialist and Director of the Blood Bank at Dr. Abdelkader Al-Mutawakkil Hospital, shared a post on LinkedIn:

“TACO or TRALI?
How to tell when a transfusion suddenly goes wrong

Respiratory distress during or after a transfusion is an emergency.
Correctly distinguishing TACO from TRALI is critical because management is different.

Timing Is a Key Clue

  • TRALI (Transfusion-Related Acute Lung Injury)
    • Onset: During transfusion or within 6 hours
    • Acute hypoxemia with no prior volume overload
  • TACO (Transfusion-Associated Circulatory Overload)
    • Onset: During transfusion or up to ~12 hours after
    • Strongly linked to fluid/volume overload

Mechanism and Bedside Clues

TACO = Circulatory/Hydrostatic Edema

Pathophysiology:

  • Excess intravascular volume → ↑ hydrostatic pressure

Clinical clues:

  • Hypertension
  • Raised JVP
  • Positive fluid balance
  • Peripheral edema
  • Cardiomegaly on CXR

Response:

  • Improves with diuretics (key differentiator)

TRALI = Noncardiogenic Lung Injury

Pathophysiology:

  • Increased capillary permeability
  • Often antibody- or biologic-mediated immune reaction

Clinical clues:

  • Hypoxemia
  • Hypotension or normotension
  • Fever may be present
  • Bilateral pulmonary infiltrates
  • No signs of volume overload

Response:

  • No improvement with diuretics
  • Requires respiratory support

Helpful Investigations

  • BNP / NT-proBNP

Elevated levels support TACO

  • NT-proBNP post/pre ratio > 1.5 → suggestive of TACO
    Not definitive alone — interpret with clinical context

Chest X-ray

  • TACO: cardiomegaly + pulmonary edema
  • TRALI: bilateral infiltrates, normal heart size

ECG / Echo

  • Helpful if cardiac cause suspected

Prevention and System-Based Safety

TACO Prevention

  • Identify high-risk patients (elderly, renal/cardiac disease)
  • Slow infusion rates
  • Limit transfusion volume
  • Consider prophylactic diuretics

TRALI Prevention

  • Donor mitigation strategies
  • Plasma donor policies
  • Investigation of implicated donors
  • Strong hemovigilance systems

Early notification of the transfusion service is essential for BOTH

Actionable Checklist for Clinicians

  • Stop the transfusion immediately
  • Call for help
  • Check vitals, oxygenation, fluid balance
  • Order chest X-ray
  • Measure BNP / NT-proBNP if available
  • Get ECG / echo if cardiac cause suspected

If TACO likely

  • Diuretics
  • Oxygen
  • Consider CPAP / ventilatory support

If TRALI likely

  • Oxygen and respiratory support
  • Avoid diuretics as primary therapy
  • Notify transfusion service for donor follow-up

Document timing, blood products, and submit hemovigilance report

Bottom line:

  • Same symptom — very different mechanisms.
  • Correct identification of TACO vs TRALI saves lives.”

Dr. Tareq Abadl

Find more posts featuring Dr. Tareq Abadl on Hemostasis Today.

Circulatory Overload Health Hematology Hemostasis Today Medicine TACO Tareq Abadl TRALI transfusion Transfusion Medicine
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