/study / lectures / Crisis Management
TRALI vs TACO vs FNHTR — Telling Them Apart
TEXTCrisis Management · 6 min read
Three transfusion reactions, three radically different management paths. Mix them up and you'll diurese a TRALI patient or volume-overload a TACO patient — both make outcomes worse.
After this lesson you can
3 min read6 sectionsTRALI — pathophysiology + diagnostic frame
Mechanism: donor HLA or HNA antibodies (most commonly from multiparous female donors sensitized in pregnancy) activate recipient neutrophils in the pulmonary capillary bed capillary leak bilateral infiltrates.
AABB current incidence ~1:10,000 units after male-predominant plasma policies — the single most effective system change ever made in transfusion safety.
Bilateral infiltrates + PaO₂/FiO₂ ≤300 + no evidence of LA hypertension + onset within 6 hr of transfusion.
TRALI — clinical signature + management
- stop transfusion
- lung-protective ventilation (TV 6 mL/kg PBW, plateau <30 cmH₂O, titrated PEEP)
- FiO₂ to keep SpO₂ ≥92%
- vasopressors for hypotension
- CONTRAINDICATED — the lung edema is capillary leak
- not volume overload
- diuresis worsens organ perfusion
Most patients recover lung function in 48-96 hours.
Report to blood bank for donor investigation; the implicated donor is typically deferred from future plasma donation.
TACO — circulatory overload
Now the most common cause of transfusion-related mortality reported to FDA.
- age >70
- pre-existing cardiac dysfunction
- renal failure
- multiple units rapidly transfused
- positive net fluid balance
- low body weight
- HYPERTENSION (the differential pearl vs TRALI)
- tachycardia
- JVD
- S3 gallop
- bilateral infiltrates
- elevated BNP
- positive fluid balance
- stop or slow transfusion
- sit patient up
- supplemental O₂
- furosemide
20-40 mgIV - NIPPV if respiratory distress
- transfuse remaining units slowly (1 mL/kg/hr) with reassessment between units
FNHTR — febrile non-hemolytic
1°C from baseline during or within 4 hours of transfusion, without hemolysis, dyspnea, or hypotension.Mechanism: cytokines (IL-1, IL-6, TNF-α) accumulated in stored cellular components, or recipient anti-leukocyte antibodies reacting with donor WBCs.
Universal leukoreduction (now standard in US/Canada/UK) reduced incidence from ~1% to ~0.1%.
- stop or slow transfusion
- rule out AHTR + TRALI + sepsis (the dangerous differentials)
- acetaminophen
650-1000 mg - supportive
Premedication with acetaminophen ± diphenhydramine for patients with recurrent FNHTR.
Document — recurrence is common.
AHTR + anaphylaxis — the dangerous mimics
Fever + back/flank pain + hemoglobinuria + hypotension + DIC.
Stop, support MAP, alkalinize urine, maintain renal output, send unit + sample back.
Anaphylaxis to plasma proteins (classic in IgA-deficient patients with anti-IgA antibodies): hypotension + bronchospasm + urticaria + airway edema without fever — managed as standard anaphylaxis with epinephrine.
Washed RBCs or IgA-deficient products for known IgA-deficient patients with prior reactions.
Bedside differential table
- TRALI ±
- TACO no
- FNHTR yes (defining)
- AHTR yes
- TRALI bilateral infiltrates
- TACO bilateral infiltrates + cardiomegaly + Kerley B
- FNHTR clear
- AHTR clear early
BNP: TRALI normal, TACO elevated.
Hemoglobinuria: only AHTR.
- TRALI + TACO within 6 hr
- FNHTR within 4 hr
- AHTR within minutes-hours
Diuretic response: only TACO.
Pulse pressure: narrow in AHTR/TRALI (vasoplegia), wide in TACO.
Document every transfusion reaction in the blood bank record system — institutional surveillance depends on it.
End of lecture
You just covered ~3 minutes of Crisis Management. Reinforce with a few questions while it's fresh.