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Stress-induced plasma beta-endorphin immunoreactivity may predict postoperative morphine usage.

M R Cohen, D Pickar, M Dubois

    Psychiatry Research
    |February 1, 1982
    PubMed
    Summary

    Stress impacts human behavior, with presurgery and surgery plasma beta-endorphin levels significantly predicting postoperative morphine needs. This research highlights biological markers for pain management in surgical patients.

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    Area of Science:

    • Psychoneuroendocrinology
    • Surgical Stress Response

    Background:

    • Stress significantly influences human behavior and physiological responses.
    • General surgery provides a relevant paradigm for studying stress and its behavioral outcomes.
    • Understanding stress markers can optimize patient recovery and pain management.

    Purpose of the Study:

    • To investigate the relationship between stress markers and postoperative pain management.
    • To determine if plasma beta-endorphin and cortisol levels predict individual morphine requirements after surgery.
    • To explore the influence of patient age on pain perception and analgesic needs.

    Main Methods:

    • Assessed plasma beta-endorphin and cortisol immunoreactivity pre- and intra-surgery.
    • Quantified total morphine usage in the first 24 postoperative hours.

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  • Utilized multiple regression analysis to identify predictive factors for morphine requirements.

    • Main Results:

    • Both presurgery and mean surgery plasma beta-endorphin levels significantly predicted morphine requirement.
    • Plasma cortisol levels showed a similar, though weaker, correlation with morphine needs.
    • Patient age was negatively correlated with morphine requirement, and beta-endorphin and age together predicted 70% of the variance in morphine use.

    Conclusions:

    • Plasma beta-endorphin levels are a strong predictor of postoperative analgesic requirements.
    • Stress hormones and patient age are key factors influencing pain management outcomes in surgical patients.
    • These findings suggest potential for personalized pain management strategies based on biological stress indicators.