Case 3: Post-Transfusion Dyspnea in a Cardiac and Renal Patient
Mrs. T is a 78-year-old woman with stage 4 chronic kidney disease (baseline creatinine 2.6 mg/dL) and an ejection fraction of 35%. She is admitted with anemia (hemoglobin 6.4 g/dL) and receives a two-unit RBC order. Both units are given back-to-back over 2 hours 45 minutes. At 16:00, about 30 minutes after the second unit ends, she is dyspneic and orthopneic with an SpO2 of 84% on room air, BP 178/98 (baseline 132/74), HR 104, temperature 37.1 °C, JVD at 45 degrees, and bilateral crackles. Chest radiograph shows bilateral perihilar and basilar airspace disease with an enlarged cardiac silhouette. BNP is 1,480 pg/mL (baseline 420). Weight is up 1.8 kg since admission. Urine output is adequate, she has no fever and no rigors, and the post-transfusion hemoglobin is 9.0 g/dL. Twenty minutes later the unit clerk calls the blood bank to ask whether the bag should be sent back.
1. Which transfusion reaction is most likely, and how do you rule the alternatives in or out?
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TACO - transfusion-associated circulatory overload. She carries every risk factor (age 78, EF 35%, stage 4 CKD) and received 2 units back-to-back in under 3 hours, several times a safe rate for her size.
Findings that support TACO: onset within 6 hours, hypertension (178/98 versus a baseline of 132/74), JVD, weight gain of 1.8 kg, cardiomegaly, BNP of 1,480 versus a baseline of 420, and hypoxemia with bilateral airspace disease that improves with diuresis.
Against TRALI: TRALI also produces hypoxemia and bilateral infiltrates within 6 hours, but there is usually no evidence of volume overload, blood pressure is normal or low, BNP is not markedly elevated, and it is linked to plasma-rich components and donor HLA/HNA antibodies. Hypertension plus a BNP nearly four times baseline points away from TRALI.
Against sepsis: temperature 37.1 °C, no rigors, and hypertension rather than hypotension or shock. Gram stain and culture of the bag would be indicated only if those signs were present.
Against AHTR: no fever, chills, flank pain, hemoglobinuria, or bleeding, and no incompatible unit was issued. The rising hemoglobin documents that the units were not hemolyzed.
2. What should happen in the next 30 minutes, and what must the blood bank do?
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Clinically: stop the transfusion, sit the patient upright, give oxygen, give IV furosemide, and monitor vital signs, urine output, and oxygen saturation.
Blood bank: the answer to the clerk's question is yes - send the bag and tubing back. Open a transfusion reaction workup even though TACO is not an immune reaction, because the facility's procedure and AABB Standards require that all suspected reactions be evaluated and reported to the medical director.
Do the following:
- Clerical check of the tag, unit number, and patient identification.
- Visual inspection of the returned bag and the patient's post-transfusion plasma for hemolysis.
- DAT if hemolysis, fever, or an incompatible crossmatch is suspected.
- Do not culture the bag unless a septic reaction is being considered.
Document the volume given, the rate, the onset time, the treatment, and the outcome in the hemovigilance system. This is a preventable event and the pattern (two units back-to-back in a cardiac patient) should be tracked and fed back to the ordering team.
3. Write the transfusion plan you would recommend for her next admission.
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- One unit at a time, with reassessment of symptoms, vital signs, and hemoglobin before a second unit is even ordered. A standing '2 units' order should not be executed as a single uninterrupted event.
- Rate: no faster than 1 mL/kg/h (roughly 60 mL/h for a 60-kg woman), so one unit takes about 4 hours rather than 80 minutes.
- Threshold: restrictive - 7 g/dL, or 8 g/dL only for active cardiac ischemia. Her hemoglobin of 6.4 g/dL justified one unit, not two.
- Pre-emptive diuretic (for example IV furosemide 20–40 mg) at the start of, or between, units, with a daily weight and fluid-balance target.
- Flag her record as high TACO risk so the blood bank and any covering clinician see it before the next order is filled.
- Involve cardiology or nephrology for volume management rather than relying on the blood bank to police transfusion indications.