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Meperidine-halothane interaction in dogs

E P Steffey, R Martucci, D Howland

    Canadian Anaesthetists' Society Journal
    |July 1, 1977
    PubMed
    Summary
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    Meperidine reduces the required dose of halothane anesthesia in dogs, with effects increasing with higher meperidine doses. Plasma meperidine levels were lower in awake dogs than in those under anesthesia.

    Area of Science:

    • Veterinary Anesthesiology
    • Pharmacology
    • Comparative Medicine

    Background:

    • Halothane is a common anesthetic agent in veterinary medicine.
    • Understanding drug interactions is crucial for safe and effective anesthesia.
    • Meperidine is an opioid analgesic with potential sedative properties.

    Purpose of the Study:

    • To investigate the interaction between meperidine and halothane in canine anesthesia.
    • To determine the effect of meperidine on the minimum alveolar concentration (MAC) of halothane.
    • To assess dose-dependent effects and plasma concentrations of meperidine.

    Main Methods:

    • 24 unmedicated, spontaneously breathing dogs were used.
    • Intramuscular injections of meperidine (2.75, 5.5, 11.0 mg/kg) were administered.

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  • The minimal alveolar concentration (MAC) of halothane was determined for each dose.
  • Plasma meperidine concentrations were measured in awake and anesthetized states.

    • Main Results:

    • Meperidine significantly reduced the MAC of halothane in a dose-dependent manner.
    • Higher doses of meperidine resulted in greater and longer-lasting MAC depression.
    • Plasma meperidine concentrations were lower in awake dogs compared to halothane-anesthetized dogs.

    Conclusions:

    • Meperidine potentiates the anesthetic effects of halothane in dogs.
    • The interaction is dose-related, requiring careful consideration during co-administration.
    • Further research may explore the clinical implications for anesthetic protocols.