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Related Experiment Videos

Chalk in the prime.

H Yeo, T Doyle, R Saynor

    Thorax
    |February 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Cloudiness in cardiopulmonary bypass circuits formed calcium carbonate crystals. These crystals, potentially causing postoperative morbidity, were not dissolved by plasma proteins or removed by standard filters, suggesting sodium bicarbonate may be unnecessary in pump prime.

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    Area of Science:

    • Cardiovascular Surgery
    • Biomedical Engineering
    • Clinical Chemistry

    Background:

    • Cloudiness observed in perfusion circuits during open intracardiac operations.
    • Potential for precipitate formation in cardiopulmonary bypass (CPB) priming fluids.

    Purpose of the Study:

    • Investigate the composition of precipitate observed in CPB circuits.
    • Determine the clinical implications of precipitate formation.
    • Evaluate the efficacy of standard filtration in removing the precipitate.

    Main Methods:

    • Laboratory experiments using Hartmann's solution and sodium bicarbonate.
    • Analysis of precipitate composition.
    • Testing dissolution with plasma proteins.
    • Assessing removal efficiency with a 40-micron arterial line filter.

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    Main Results:

    • Precipitate identified as calcium carbonate crystals.
    • Crystals did not dissolve in plasma proteins.
    • Standard 40-micron filtration was insufficient for complete crystal removal.
    • Potential for microvascular embolization.

    Conclusions:

    • Calcium carbonate crystal formation is a risk in CPB using sodium bicarbonate-containing primes.
    • Standard filtration methods are inadequate for crystal clearance.
    • Microvascular embolization of crystals may contribute to postoperative morbidity.
    • Re-evaluation of sodium bicarbonate addition to pump prime is warranted.