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[Subarachnoid anesthesia with hyperbaric bupivacaine].

S Okazaki, K Ogata, E Kawaguchi

    Masui. the Japanese Journal of Anesthesiology
    |July 1, 1989
    PubMed
    Summary

    Hyperbaric bupivacaine spinal anesthesia showed a faster onset but shorter duration compared to isobaric solutions. Lower rates of hypotension were observed in hyperbaric groups, with no significant complications.

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    Area of Science:

    • Anesthesiology
    • Pharmacology

    Background:

    • Subarachnoid anesthesia is a common technique for lower abdominal and extremity surgeries.
    • Bupivacaine is a widely used local anesthetic for spinal anesthesia.
    • Adjusting the specific gravity of anesthetic solutions can influence their behavior within the cerebrospinal fluid.

    Purpose of the Study:

    • To compare the effects, duration, and complications of hyperbaric bupivacaine solutions with isobaric 0.5% bupivacaine.
    • To evaluate the clinical performance of bupivacaine solutions with adjusted specific gravities (1.044 and 1.033) versus isobaric solutions.

    Main Methods:

    • A comparative study involving 30 patients undergoing lower body surgery.
    • Patients were divided into three groups receiving either hyperbaric or isobaric bupivacaine via subarachnoid injection at L3-4.

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  • Dosage varied from 2.0 to 4.0 ml based on patient height.

    • Main Results:

    • Hyperbaric bupivacaine groups exhibited a higher analgesic zone margin initially, which receded over time, showing significant differences at 120 minutes compared to the isobaric group.
    • Hypotension occurred less frequently in the hyperbaric groups.
    • The shorter duration of analgesia in hyperbaric groups may be linked to lower bupivacaine concentrations (0.40% and 0.45%).

    Conclusions:

    • Hyperbaric bupivacaine solutions offer a potential alternative for subarachnoid anesthesia, characterized by reduced hypotension.
    • Further research may be needed to optimize hyperbaric bupivacaine formulations for sustained analgesia.
    • A 0.5% bupivacaine solution with a higher specific gravity is suggested for market preference.