Post-CPB diffuse bleeding: fibrinogen first or platelets first?
After CPB, diffuse bleeding with low fibrin-based clot firmness and reduced global clot strength can reflect fibrinogen deficit, platelet contribution, or both. The decision is pattern-based and must be reassessed.
Clinical scenario
A 68-year-old man undergoes combined CABG and aortic valve replacement. After protamine and separation from CPB, the surgical field shows diffuse microvascular oozing rather than a single obvious bleeding point. Temperature is 35.4°C. pH is 7.29. Ionized calcium is low-normal. Platelet count is 92,000/µL. ROTEM shows low FIBTEM clot firmness and reduced EXTEM clot firmness. Lysis is not increased.
The surgeon asks whether to give platelets first.
Reasoning goals
- Recognize this as post-CPB diffuse bleeding — not automatically surgical bleeding, and not automatically a platelet-only problem.
- Read low fibrin-based clot firmness as a strong clue that the fibrinogen contribution is inadequate.
- Understand that reduced global clot strength may reflect both fibrinogen and platelet contribution.
- Explain why fibrinogen correction is often considered before platelet therapy when fibrin-based clot firmness is clearly low.
- Correct physiology and reassess the change after treatment.
- Keep surgical field confirmation active throughout.
A. What is the first split?
- Name the split before reaching for a product: surgical source, coagulopathy, or a mixed picture.
- Diffuse oozing suggests a coagulopathy, but it does not exclude a surgical source.
B. What does the VET pattern suggest?
- Low fibrin-based clot firmness suggests an inadequate fibrin contribution to clot strength.
- Reduced global clot strength may be partly fibrinogen-driven and partly platelet-driven.
- No increased lysis means hyperfibrinolysis is not the main signal here.
C. Why not treat this as platelets only?
- The platelet count is low, but a low fibrin contribution can limit clot strength on its own.
- Platelet transfusion alone may not fix a fibrinogen-limited clot.
- Mixed deficits are common after CPB.
A low fibrin signal is not an automatic transfusion order
Low fibrin-based clot firmness points to where to look and what to prepare. Interpret it against the bleeding pattern and the surgical field, and reassess after any targeted correction — it does not, on its own, mandate a product.
D. Action frame
- Confirm there is no major focal surgical source.
- Correct temperature, pH, and ionized calcium.
- Consider fibrinogen concentrate or cryoprecipitate according to institutional protocol and local blood bank availability.
- Reassess the VET pattern and the actual bleeding.
- Consider platelet therapy if clot strength remains low with a reduced platelet contribution after fibrinogen correction.
- Keep source control in view throughout.
Take-home message
When post-CPB diffuse bleeding shows low fibrin-based clot firmness, fibrinogen contribution often becomes the first correction target — but the patient, surgical field, physiology, and reassessment decide the sequence.
Clinical content by Kozo Watanabe, MD View profile →
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