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Related Experiment Videos

Jet ventilation using low or high frequencies, during bronchoscopy.

M Fischler, F Seigneur, B Bourreli

    British Journal of Anaesthesia
    |April 1, 1985
    PubMed
    Summary

    High-frequency jet ventilation (HFJV) via bronchoscope affects lung mechanics. Adjusting inspiratory-expiratory (I/E) ratios and ventilation rates impacts pressures and volumes, with potential clinical implications for barotrauma and lung volume.

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    Area of Science:

    • Respiratory physiology
    • Mechanical ventilation
    • Pulmonary mechanics

    Background:

    • High-frequency jet ventilation (HFJV) is used in critical care settings.
    • Bronchoscopic delivery of HFJV requires understanding its impact on lung mechanics.
    • Previous studies have not fully elucidated the effects of varying HFJV parameters during bronchoscopy.

    Purpose of the Study:

    • To evaluate the effects of different inspiratory-expiratory (I/E) ratios and ventilation rates on lung mechanics during bronchoscopic HFJV.
    • To assess the impact of bronchoscope occlusion by a telescope on ventilation parameters.
    • To identify potential risks, such as barotrauma, associated with this ventilation technique.

    Main Methods:

    • A lung model with normal compliance and increased airway resistance was used.

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  • Jet ventilation was delivered through a bronchoscope.
  • Three I/E ratios (0.25, 0.43, 0.67) and seven ventilation rates (20-230 cycles/min) were tested.
  • The bronchoscope was studied in both unoccluded and telescope-occluded states.

    • Main Results:

    • Increased I/E ratios led to higher minute ventilation, peak airway pressure, end-expiratory pressure, and lung volume.
    • Increased ventilation rates decreased peak airway pressure but raised end-expiratory pressure and lung volume.
    • Minute ventilation increased with ventilation rate, or plateaued at high I/E ratios.
    • Telescope occlusion reduced minute ventilation and increased end-expiratory pressure and lung volume.

    Conclusions:

    • HFJV via bronchoscope can be adjusted to modify lung pressures and volumes.
    • While HFJV may reduce barotrauma risk from high peak pressures, increased lung volume, especially with telescope use, warrants clinical attention.
    • Careful parameter selection is crucial for safe and effective bronchoscopic HFJV.