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Related Experiment Videos

Tourniquet release: systemic and metabolic effects

H S Townsend1, S B Goodman, D J Schurman

  • 1Department of Orthopedic Surgery, Stanford University Medical Center, California, USA.

Acta Anaesthesiologica Scandinavica
|November 1, 1996
PubMed
Summary

Tourniquet release after knee surgery can lower blood pressure and alter metabolic markers in patients under general anesthesia. These effects are more pronounced than in patients receiving epidural anesthesia, impacting clinical outcomes.

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Area of Science:

  • Anesthesiology
  • Orthopedic Surgery
  • Physiology

Background:

  • Pneumatic tourniquets are used in orthopedic surgery to induce limb ischemia.
  • Tourniquet release can cause significant physiological changes.
  • General anesthesia may influence the body's response to tourniquet release.

Purpose of the Study:

  • To investigate the systemic hemodynamic and metabolic effects of tourniquet release during total knee replacement under general anesthesia.
  • To compare these effects with findings from patients undergoing similar procedures under epidural anesthesia.

Main Methods:

  • Eleven adult patients undergoing total knee replacement under general anesthesia were studied.
  • Systemic blood pressure and metabolic parameters were monitored before and after tourniquet release.

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  • Data analysis focused on changes in mean arterial pressure (MAP), pH, PaO2, PaCO2, lactate, and potassium levels.

    • Main Results:

    • Mean arterial pressure (MAP) significantly decreased within 3 minutes of tourniquet release, persisting for 15 minutes.
    • Arterial pH, PaO2, PaCO2, lactate, and potassium showed significant transient changes post-release, normalizing within 30 minutes.
    • Patients under general anesthesia exhibited a reduced ability to compensate for the metabolic load compared to those under epidural anesthesia.

    Conclusions:

    • Tourniquet release during total knee replacement under general anesthesia causes significant, albeit transient, hemodynamic and metabolic disturbances.
    • The inability to alter ventilatory rate under general anesthesia limits compensation for tourniquet-induced metabolic changes.
    • These findings are clinically relevant for elderly patients with compromised cardiopulmonary reserve.