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Local anesthetics and tracheal ring ciliary activity.

B R Manawadu, S R Mostow, F M LaForce

    Anesthesia and Analgesia
    |July 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

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    Local anesthetics impact ciliary activity in the airways. Mepivacaine showed minimal toxicity, while bupivacaine caused irreversible damage, highlighting varying risks for respiratory function.

    Area of Science:

    • Pharmacology
    • Respiratory Physiology
    • Toxicology

    Background:

    • Ciliary activity is crucial for mucociliary clearance in the respiratory tract.
    • Local anesthetics are frequently used in procedures involving airways, necessitating an understanding of their effects on respiratory function.

    Purpose of the Study:

    • To investigate the in vitro effects of commonly used local anesthetics on ferret tracheal ciliary activity.
    • To compare the toxicity and reversibility of ciliary depression caused by different local anesthetic agents.

    Main Methods:

    • Ferret tracheal rings were utilized for in vitro studies.
    • Ciliary activity was assessed visually following exposure to varying concentrations of mepivacaine, lidocaine, procaine, chloroprocaine, and bupivacaine.
    • Reversibility of effects was determined after washing out the anesthetics.

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    Main Results:

    • Mepivacaine exhibited the least toxicity, with no observed effect on ciliary activity at 1.0%.
    • Bupivacaine demonstrated the highest toxicity, causing irreversible damage to respiratory epithelium at 0.13% and ciliostasis at lower concentrations.
    • Lidocaine, procaine, and chloroprocaine depressed ciliary activity, with generally reversible effects upon anesthetic removal.

    Conclusions:

    • Local anesthetic agents vary significantly in their effects on respiratory ciliary function.
    • Bupivacaine poses a substantial risk to respiratory epithelium integrity, even at low concentrations.
    • Mepivacaine appears to be a safer choice regarding ciliary activity preservation during airway procedures.