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Postoperative pain relief by epidural morphine

N Rawal, U Sjöstrand, B Dahlström

    Anesthesia and Analgesia
    |October 1, 1981
    PubMed
    Summary

    Epidural morphine effectively manages postoperative pain in 87% of patients, offering long-lasting analgesia with minimal respiratory depression. Lower doses are recommended for elderly patients.

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    Area of Science:

    • Anesthesiology
    • Pain Management
    • Pharmacology

    Background:

    • Postoperative pain management is crucial for patient recovery and mobility.
    • Epidural analgesia is a common method for managing surgical pain.
    • Optimizing epidural morphine dosage is essential to balance efficacy and safety.

    Purpose of the Study:

    • To evaluate the efficacy and safety of epidural morphine for postoperative pain relief.
    • To determine optimal dosage regimens for different patient groups and surgical types.
    • To assess the impact of epidural morphine on respiratory function and patient mobility.

    Main Methods:

    • A study involving 280 patients undergoing various surgeries.
    • Administration of 2 mg or 4 mg of morphine via an indwelling epidural catheter post-surgery.
    • Assessment of pain relief, duration of analgesia, plasma morphine concentrations, peak expiratory flow, and arterial blood gases.

    Main Results:

    • Excellent analgesia (87%) and high patient satisfaction (96.5%) were achieved.
    • Mean duration of analgesia was 10.7 hours; 30% experienced complete relief for the entire period.
    • No significant early postoperative respiratory depression was observed; early ambulation was facilitated.

    Conclusions:

    • 2 mg of epidural morphine provides effective, long-lasting analgesia with low plasma levels and minimal side effects.
    • Higher doses (4 mg) may be needed for thoracic and upper abdominal surgery in healthy patients.
    • Elderly and frail patients require doses not exceeding 2 mg due to increased sensitivity, avoiding delayed respiratory depression.

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