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Related Experiment Videos

Anaesthesia and tympanometry.

A B Drake-Lee, W F Casey

    International Journal of Pediatric Otorhinolaryngology
    |November 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Nitrous oxide and positive pressure respiration increased middle ear pressure in children. In those with secretory otitis media, nitrous oxide alone aided aeration if gas was initially present.

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    Area of Science:

    • Otolaryngology
    • Anesthesiology
    • Pediatrics

    Background:

    • Middle ear pressure management is crucial during anesthesia.
    • Secretory otitis media can affect middle ear aeration.
    • Understanding gas dynamics in the middle ear is important for pediatric patients.

    Purpose of the Study:

    • To investigate the effects of nitrous oxide and intermittent positive pressure respiration on middle ear pressure in children.
    • To determine the role of nitrous oxide in middle ear aeration in children with secretory otitis media.
    • To assess the predictive value of wide range tympanometry for intraoperative middle ear findings.

    Main Methods:

    • Children undergoing general anesthesia were studied.
    • Middle ear pressure was monitored during anesthesia, with and without nitrous oxide and intermittent positive pressure respiration.

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  • Wide range tympanometry was performed prior to myringotomy.

    • Main Results:

    • Nitrous oxide combined with intermittent positive pressure respiration significantly increased middle ear pressure in children with normal middle ears.
    • In children with secretory otitis media, nitrous oxide alone facilitated middle ear aeration, but only if some gas was initially present.
    • Wide range tympanometry findings correlated well with observations made during myringotomy.

    Conclusions:

    • Nitrous oxide and positive pressure ventilation can alter middle ear pressure in pediatric patients.
    • The aeration effect of nitrous oxide in secretory otitis media is dependent on pre-existing middle ear gas.
    • Wide range tympanometry is a reliable tool for predicting intraoperative middle ear conditions.