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Related Experiment Videos

Errors in data derived from pulmonary artery blood gas values.

P M Suter, J M Lindauer, H B Fairley

    Critical Care Medicine
    |September 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

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    Sampling blood from Swan-Ganz catheters can lead to "arterialized" blood contamination, affecting pulmonary artery blood gas analysis. This contamination, influenced by withdrawal rate, can cause significant errors in critical patient calculations.

    Area of Science:

    • Critical Care Medicine
    • Cardiopulmonary Physiology
    • Medical Device Accuracy

    Background:

    • Swan-Ganz catheters are crucial for hemodynamic monitoring in acute pulmonary failure.
    • Accurate blood gas analysis is vital for managing critically ill patients.
    • Potential for blood sample contamination requires thorough investigation.

    Purpose of the Study:

    • To evaluate the risk of "arterialized" blood contamination in pulmonary artery samples.
    • To examine the mechanism of blood gas contamination via Swan-Ganz catheters.
    • To assess the impact of contamination on clinical calculations.

    Main Methods:

    • Blood gas values were measured from Swan-Ganz pulmonary artery catheters in 25 patients.
    • Samples were withdrawn at different rates (3 ml/min and 23 ml/min).

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  • Blood oxygen content was compared between main and segmental pulmonary arteries.

    • Main Results:

    • Significant increases in blood oxygen content were observed from main to segmental pulmonary arteries.
    • Distal oxygen content ranged from 100-116% of proximal values at 3 ml/min (p<0.01).
    • Distal oxygen content ranged from 100-140% of proximal values at 23 ml/min (p<0.001).

    Conclusions:

    • Sampling from a deflated Swan-Ganz catheter can introduce "arterialized" blood.
    • This contamination can lead to substantial errors in cardiac output (Fick method) and shunt fraction calculations.
    • Clinical practice requires careful consideration of sampling techniques to ensure accuracy.