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An algorithm for preventing bypass-associated dilutional (BAD) coagulopathy: Theory and example.

Paul C Herrmann¹, Karen L Hay, Brian S Bull

¹School of Medicine, Department of Pathology and Human Anatomy, Loma Linda University, Loma Linda, CA 92350, USA.

Blood Cells, Molecules & Diseases

|April 30, 2010

Summary

Administering fluids during cardiopulmonary bypass can dilute clotting factors, risking bleeding. This study presents algorithms to manage fluid administration and prevent excessive protamine, ensuring safer patient outcomes.

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Area of Science:

Cardiovascular Surgery
Hematology
Anesthesiology

Background:

Crystalloid administration during cardiopulmonary bypass can dilute clotting factors.
Low blood volume patients are particularly susceptible to dilution effects.
Dilution below 38% clotting factor concentration is associated with significant bleeding risk.

Purpose of the Study:

To develop algorithms for quantifying dilution risk during cardiopulmonary bypass.
To determine the maximum safe fluid administration volume.
To provide a method for preventing excessive protamine administration.

Main Methods:

Development of mathematical algorithms to assess dilution risk.
Calculation of safe fluid volumes based on patient parameters.
Formulation of a confirmatory calculation for protamine neutralization.

Main Results:

Algorithms quantify the risk of clotting factor dilution.
Maximum safe fluid administration limits are established.
A method to prevent over-neutralization of heparin with protamine is described.

Conclusions:

Dilution risk can be quantified and managed through algorithmic fluid administration.
Preventing excessive protamine administration is crucial for maintaining hemostasis.
These algorithms enhance patient safety during cardiopulmonary bypass.