Fever, Chills, and Hypoxemia During a Second Unit of Packed Cells in a Patient With Heart Failure
Mrs. K is 72 years old, weighs 48 kg, and has heart failure with an ejection fraction of 35% plus stage 3 chronic kidney disease. She is receiving her second unit of packed red cells for a hemoglobin of 7.1 g/dL and dyspnea. Baseline: temperature 36.8 C, heart rate 88, blood pressure 138/76, respirations 18, SpO2 94% on 2 L. The first unit ran over 2 hours without incident. Fifteen minutes into unit two, running at 150 mL/hr, she reports chills and back discomfort. Temperature is 38.4 C, heart rate 108, blood pressure 156/88, respirations 26, and SpO2 88% on 2 L. She is sitting upright with coarse crackles bilaterally, distended neck veins, and a 1.2 kg weight gain since admission. Urine output has been 20 mL/hr.
1. What are your immediate actions, and what do you send to the blood bank?
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Stop the transfusion immediately - do not flush the tubing. Keep the line patent with 0.9% sodium chloride through new tubing at a minimal rate, because she is volume-overloaded and you need the line mainly for medications.
In order:
- Stay with her, call for help, sit her upright, and apply oxygen per order to keep SpO2 at least 92%.
- Full set of vital signs; auscultate lungs; assess neck veins, edema, and urine output.
- Notify the provider and the blood bank now - both, not one or the other.
- Perform the bedside clerical check comparing the unit tag and label to her identification and blood bank number.
- Return the bag and tubing to the blood bank (do not discard) and send the post-transfusion specimens and a urine specimen for hemoglobinuria per policy.
- Anticipate a diuretic order and response to it.
- Do not restart the transfusion until the provider and blood bank clear it.
Volume overload is being treated, but a hemolytic reaction is not yet excluded, so the specimens and clerical check are mandatory even though the picture looks cardiac.
2. Which reaction is most likely, which findings argue for and against the alternatives, and what data would settle it?
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Most likely: transfusion-associated circulatory overload (TACO). Supporting findings are hypertension (156/88 versus 138/76), distended neck veins, bilateral crackles, a 1.2 kg weight gain, oliguria, ejection fraction 35%, and low body mass. The rate is also a red flag: 150 mL/hr in a 48 kg patient is about 3 mL/kg/hr, well above the roughly 1 mL/kg/hr often recommended for patients at risk for TACO.
Arguments against TRALI: TRALI typically produces hypoxemia with hypotension and no evidence of volume overload, and it does not cause hypertension, neck vein distension, or weight gain.
Fever complicates the picture. A 1.6 C rise is atypical for pure TACO. A febrile non-hemolytic reaction explains fever and chills but not the pulmonary findings or hypoxemia. An acute hemolytic reaction must be considered because it can cause fever, chills, back pain, and hypoxemia - but hypertension and clear volume overload argue against it, and hypotension is more typical.
Data to settle it: response to diuresis, chest radiograph (pulmonary edema versus clear lungs), BNP, repeat vital signs and weights, the clerical check, and hemolysis studies (plasma free hemoglobin, haptoglobin, LDH, bilirubin, direct antiglobulin test) plus the blood bank workup. Regardless of cause, the unit stays stopped.
3. She stabilizes after diuresis. Her hemoglobin is 7.6 g/dL and the team wants to give the rest of the unit tonight. What plan do you advocate, and what would you refuse or question?
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Reassess the indication first. With a hemoglobin of 7.6 g/dL and a restrictive strategy, the question is whether she is still symptomatic - transfusing to a number rather than for symptoms or bleeding is not justified, especially after a TACO episode.
If a transfusion is still indicated, advocate for:
- One unit only, then reassess clinically and with a repeat count.
- Rate no faster than about 1 mL/kg/hr (roughly 50 mL/hr for her) for the first 15-30 minutes, then titrate to tolerance, with the total unit completed within 4 hours.
- Vital signs every 15 minutes, with lung sounds, SpO2, neck vein assessment, and strict intake and output plus daily weights.
- A pre-emptive diuretic order and a plan for what to do if crackles or dyspnea develop.
- Consider splitting the unit or extending the infusion across a longer window if tolerated.
Question or refuse: premedicating with acetaminophen and diphenhydramine does not prevent TACO and may mask an early febrile reaction, so it is not a substitute for slower rate and monitoring. Refuse to run at the previous 150 mL/hr rate, and refuse to restart the original unit bag. Document the reaction and ensure it is flagged in the record so future orders account for it.