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Acute Hemolytic Transfusion Reaction — Recognition + Algorithm
TEXTCrisis Management · 6 min read
Wrong-blood-to-wrong-patient is rare but devastating. ABO incompatibility triggers complement-mediated intravascular hemolysis within minutes. Recognize, stop, support — and don't ever skip the bedside check.
After this lesson you can
2 min read5 sections- Recognize AHTR in awake vs anesthetized patient.
- Execute the immediate response algorithm.
- Support kidneys + treat DIC.
- Prevent via bedside two-provider verification.
Pathophysiology
- cytokine storm (TNF-α, IL-1, IL-6)
- DIC activation
- acute kidney injury from hemoglobinuria + renal vasoconstriction
- hypotension from bradykinin + complement
- bronchospasm
Mortality ~10% in severe cases.
Cause: clerical error (wrong patient identification at the bedside) > sample mis-collection > lab error.
Clinical recognition in awake vs anesthetized patient
- fever
- chills
- flank or back pain
- chest pain
- anxiety
- dyspnea
- nausea
- hypotension
- hemoglobinuria (red/brown urine)
- feeling of 'impending doom.' Under anesthesia: subtle
Look for unexplained hypotension + tachycardia after transfusion start, hemoglobinuria appearing in Foley bag (early sign), oozing from IV sites (DIC), bronchospasm/↑PIP, dropping SpO₂.
ANY new instability after transfusion start = stop and investigate.
Immediate response algorithm
Maintain IV access — keep the line open with normal saline (NOT LR — calcium activates clotting in residual blood).
Recheck patient ID and unit ID at bedside — verify the right patient is matched to the right unit.
Send patient blood sample + the implicated unit + administration tubing back to blood bank for re-typing + cross-match + direct Coombs + free hemoglobin.
Notify blood bank by phone — the unit may be mis-labeled and other patients at risk.
Supportive treatment
Maintain urine output ≥1-2 mL/kg/hr to flush hemoglobin from kidneys — use fluid + furosemide 0.5-1 mg/kg IV + mannitol 12.5-25 g IV if oliguric.
Treat DIC supportively (fresh blood products as needed).
Bicarbonate to alkalinize urine (pH >7) is traditional but evidence is weak — controversial.
ICU admission.
Coags + Hgb + Cr + LDH + haptoglobin + direct bilirubin + urine hemoglobin q-4h.
Prevention — bedside identification is the only barrier
Two-provider verification of patient identity (band, full name, MRN) + unit identity (donor number, ABO, Rh, expiration) + compatibility tag immediately before transfusion.
Document the check.
Never delegate the bedside check to a tech alone.
Many institutions now use barcode scanning to enforce the check.
⚠ Common pitfalls
- Skipping the bedside check 'because it was just a unit ago' — every transfusion needs it.
- Continuing to transfuse despite new hypotension + hemoglobinuria — STOP first, investigate second.
- Using LR to flush the line — calcium reactivates citrated blood; use NS only.
- Not sending the implicated unit back to blood bank — other patients may be at risk if mislabeled.
💎 Clinical pearls
- Hemoglobinuria appearing in the Foley bag mid-case is often the FIRST sign in an anesthetized patient.
- Two-provider bedside verification is the last line of defense — never skip it.
- Hgb-induced AKI: maintain UOP ≥1-2 mL/kg/hr with fluid + furosemide + mannitol.
- Mortality ~10% in severe AHTR — almost all cases are preventable clerical errors.
Recap
- Hemoglobinuria appearing in the Foley bag mid-case is often the FIRST sign in an anesthetized patient.
- Two-provider bedside verification is the last line of defense — never skip it.
- Hgb-induced AKI: maintain UOP ≥1-2 mL/kg/hr with fluid + furosemide + mannitol.
- Mortality ~10% in severe AHTR — almost all cases are preventable clerical errors.
Mark each section done to complete the module.
References
- · Miller's Anesthesia 9e ch 49 (Transfusion Medicine)
- · AABB Technical Manual 21e (2023)
- · Sahu, Indian J Anaesth 2014 (Acute transfusion reactions)
- · Vamvakas & Blajchman, Blood 2009 (Transfusion mortality)