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Hypothermic anesthesia attenuates postoperative proteolysis.

D J Johnson, D C Brooks, V M Pressler

    Annals of Surgery
    |October 1, 1986
    PubMed
    Summary
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    Major surgery typically causes muscle breakdown and nitrogen loss. However, cardiac surgery using cardiopulmonary bypass, anesthesia, and hypothermia significantly reduced this catabolic response in patients and animal models.

    Area of Science:

    • Surgical Metabolism
    • Physiology
    • Anesthesiology

    Background:

    • Major operations usually trigger a catabolic response, involving muscle protein breakdown and increased nitrogen excretion.
    • This response is critical in patient recovery and metabolic management post-surgery.

    Purpose of the Study:

    • To investigate the absence of the typical catabolic response in patients undergoing cardiac surgery.
    • To evaluate the role of specific anesthetic and supportive measures in modulating the surgical catabolic state.

    Main Methods:

    • Measured forearm nitrogen release and nitrogen excretion in cardiac surgery patients.
    • Assessed hindquarter amino acid nitrogen release and urea production in animal models under varying conditions.
    • Compared postoperative metabolic markers to preoperative and control values.

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    Main Results:

    • Cardiac surgery patients exhibited significantly reduced forearm nitrogen release (25% of preoperative values) postoperatively.
    • Animal studies showed an 84% reduction in hindquarter amino acid nitrogen release in response to hypothermia, fentanyl anesthesia, and neuromuscular blockade.
    • Nitrogen excretion and urea production were comparable to non-stressed states in patients and reduced in animal models.

    Conclusions:

    • The combination of hypothermia, narcotic anesthesia, and neuromuscular blockade significantly attenuates the catabolic response to major surgical injury.
    • These findings suggest a potential therapeutic strategy for managing critically ill surgical patients by mitigating metabolic stress.