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Related Experiment Videos

Using conventional infant ventilators at unconventional rates.

S J Boros, D R Bing, M C Mammel

    Pediatrics
    |October 1, 1984
    PubMed
    Summary
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    Ventilator rate significantly impacts delivered volumes in infants. Tidal volume decreases at higher rates, while minute volume plateaus then declines, influenced by inspiratory pressure and time.

    Area of Science:

    • Pediatric critical care medicine
    • Mechanical ventilation
    • Respiratory physiology

    Background:

    • Optimizing mechanical ventilator settings is crucial for infant respiratory support.
    • Understanding the relationship between ventilator parameters and gas delivery is essential for patient outcomes.

    Purpose of the Study:

    • To investigate the impact of increasing ventilator rates on delivered tidal and minute volumes in infants.
    • To assess how peak inspiratory pressure (Pmax), positive end-expiratory pressure (PEEP), and inspiration to expiration (I:E) ratio affect delivered volumes at various ventilator rates.

    Main Methods:

    • Five continuous-flow, time-cycled, pressure-preset infant ventilators were tested.
    • Measurements included tidal volume, minute volume, and airway pressures using a pneumotachograph and airway pressure monitor.

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  • A lung simulator was employed to standardize testing conditions.

    • Main Results:

    • Tidal volume remained constant until 25-30 breaths/min, then decreased as rates increased.
    • Minute volume increased until 75 breaths/min, then plateaued and subsequently decreased.
    • Increasing Pmax increased tidal volume, while increasing PEEP decreased it.
    • At rates >75 breaths/min, the I:E ratio significantly influenced delivered volume.

    Conclusions:

    • Infant ventilators have maximum effective rates for tidal and minute volume delivery.
    • Ventilator settings like Pmax, PEEP, and I:E ratio critically modulate delivered volumes.
    • Rapid rates necessitate careful consideration of inspiratory time to ensure adequate ventilation.