Rishdha Roshad: Hemodilution vs Transfusion on CPB – Balancing Oxygen Delivery and Microcirculatory Flow
Rishdha Roshad, BS Cardiac Perfusion Technology Student at Dow University of Health Sciences, shared a post on LinkedIn:
” ‘Would you transfuse?’
The patient’s hematocrit falls to 22% shortly after initiating cardiopulmonary bypass.
Do you reach for blood?
Or do you pause and assess the bigger picture?
This is where perfusion becomes more than managing a machine.
It becomes the science of interpreting physiology.
A falling hematocrit is expected during CPB as the patient’s blood mixes with the circuit prime. While oxygen-carrying capacity decreases, blood viscosity also falls, which may improve microcirculatory flow and tissue perfusion.
The challenge is recognizing -when hemodilution remains physiologically acceptable—and when it no longer does.
No single number can answer that question.
A hematocrit value gains meaning only when interpreted alongside the patient’s overall physiological status:
- Is oxygen delivery (DO₂) adequate?
- Is pump flow sufficient for the patient’s metabolic demands?
- What is the trend in lactate and acid-base status?
- How is tissue perfusion evolving?
- What is changing – and why?
Perhaps this is one of the greatest lessons in perfusion.
We don’t transfuse because of a number.
We transfuse because the patient’s physiology tells us it is necessary.
Every patient is different.
Every bypass run is different.
And every decision is a balance between preserving oxygen delivery, minimizing unnecessary transfusion, and supporting the physiology of the patient in front of us.
I’d love to hear from the perfusion community:
When faced with a falling hematocrit during CPB, what physiological indicators have the greatest influence on your transfusion decision?
I’m looking forward to learning from your experiences.”
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