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Postoperative spinal analgesia with morphine

K Samii, M Chauvin, P Viars

    British Journal of Anaesthesia
    |August 1, 1981
    PubMed
    Summary
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    Intrathecal morphine effectively manages postoperative pain. Lower doses (0.02 mg/kg) are recommended due to fewer side effects, but require careful patient monitoring for potential respiratory depression.

    Area of Science:

    • Anesthesiology
    • Pharmacology
    • Pain Management

    Background:

    • Postoperative pain is a significant concern for patient recovery.
    • Intrathecal morphine is an effective analgesic but carries risks.
    • Optimizing the dose and administration of intrathecal morphine is crucial for balancing efficacy and safety.

    Purpose of the Study:

    • To compare the efficacy and safety of two different doses of intrathecal morphine for postoperative pain relief.
    • To evaluate the incidence of adverse effects associated with each dose.
    • To determine optimal clinical practice guidelines for intrathecal morphine administration.

    Main Methods:

    • A randomized study involving 60 patients experiencing postoperative pain.
    • Patients received either a low dose (0.02 mg/kg) or a high dose (0.2 mg/kg) of morphine hydrochloride intrathecally.

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  • Analgesia duration, potency, and adverse events were systematically recorded and compared between groups.

    • Main Results:

    • The high-dose group experienced more potent and longer-lasting analgesia compared to the low-dose group.
    • Adverse effects, including sedation, decreased heart rate and blood pressure, nausea, and urinary retention, were more frequent in the high-dose group.
    • Two patients in the high-dose group exhibited delayed respiratory depression, occurring 7 and 11 hours post-administration.

    Conclusions:

    • Intrathecal morphine at 0.02 mg/kg provides effective postoperative analgesia with a potentially better safety profile.
    • Patients receiving low-dose intrathecal morphine require prolonged head-up positioning to mitigate risks.
    • Administration should occur in facilities equipped to manage potential respiratory depression, especially with higher doses.