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Metabolic changes after tourniquet release.

L Deen, C L Nyst, W W Zuurmond

    Acta Anaesthesiologica Belgica
    |January 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

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    During orthopedic surgery, capnography monitoring revealed a significant increase in end-tidal carbon dioxide (ETCO2) after tourniquet release. This capnographic change correlates with arterial blood gas shifts, indicating its utility in reflecting physiological responses.

    Area of Science:

    • Anesthesiology
    • Physiology
    • Surgical Monitoring

    Background:

    • Tourniquet use in orthopedic surgery creates ischemia, leading to physiological changes upon release.
    • Monitoring these changes is crucial for patient safety and effective anesthetic management.

    Purpose of the Study:

    • To investigate the relationship between end-tidal carbon dioxide (ETCO2) changes and arterial blood gas (ABG) values after tourniquet release during lower extremity orthopedic surgery.
    • To assess the utility of capnography in reflecting physiological disturbances following tourniquet deflation.

    Main Methods:

    • Capnography and arterial blood gas analysis were performed on intubated, mechanically ventilated patients undergoing orthopedic surgery with tourniquet use.
    • Measurements were taken at baseline and at intervals (1, 10, and 30 minutes) after tourniquet release.

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  • Eight patients were included in this observational study.

    • Main Results:

    • A significant increase in ETCO2 was observed immediately after tourniquet release, peaking at 3 minutes.
    • Arterial carbon dioxide tension (PaCO2) increased, while pH, standard bicarbonate (HCO3-), and base excess decreased within one minute of tourniquet release.
    • These capnographic trends appeared to mirror the observed arterial blood gas alterations.

    Conclusions:

    • Capnography, specifically the measurement of ETCO2, can serve as a valuable non-invasive tool to monitor physiological changes occurring after tourniquet release in orthopedic surgery.
    • The observed rise in ETCO2 and associated blood gas shifts highlight the systemic impact of reperfusion following ischemia.