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Local anesthetics potentiate spinal morphine antinociception
B Akerman1, E Arweström, C Post
1Research Laboratory, Astra Alab AB, Södertälje, Sweden.
Anesthesia and Analgesia
|October 1, 1988
Summary
Local anesthetics enhance spinal morphine analgesia in mice. Combining these drugs significantly boosts pain relief intensity and duration, suggesting clinical potential for improved pain management.
Area of Science:
- Pharmacology
- Neuroscience
- Anesthesiology
Background:
- Postulated synergistic analgesic effects of local anesthetics and opiates via intrathecal or epidural administration.
- Limited objective evidence quantitating the synergistic analgesic effect of combined local anesthetics and opiates.
Purpose of the Study:
- To compare the antinociceptive effects of intrathecal injections of morphine combined with bupivacaine or lidocaine against their individual effects.
- To quantitate the synergistic analgesic effect of spinal morphine and local anesthetics.
Main Methods:
- Antinociceptive effects were assessed using tail-flick and hot-plate tests in mice.
- Intrathecal injections of morphine (0.1-1.6 µg) were administered alone and in combination with bupivacaine (25 µg) or lidocaine (200 µg).
- Motor block effects were also evaluated.
Main Results:
- Combinations of morphine with bupivacaine or lidocaine produced significantly greater antinociception than either agent alone.
- The intensity and duration of antinociception were enhanced when morphine was combined with local anesthetics.
- Combinations involving low-dose morphine, which had minimal effect alone, showed enhanced antinociception, without affecting motor block.
Conclusions:
- Local anesthetics potentiate spinal morphine-induced antinociception in mice.
- This synergistic effect, particularly with low-dose morphine, has potential clinical implications for pain management strategies.