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SensorMedics high frequency oscillatory ventilator

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SensorMedics high-frequency oscillatory ventilator

The SensorMedics high-frequency oscillatory ventilator is a patented high-frequency (>150 Rf) mechanical ventilator by Cardinal Health. The 3100A model was approved for use in the United States by the Food and Drug Administration in 1991 for neonatal application for the treatment of all forms of respiratory failure; then subsequently approved in 1995 for Pediatric Application, with no upper "weight limit", for treating selected patients failing conventional ventilation. The High-frequency oscillatory ventilator

Contents

3100A

The 3100A model is used for infants and children under 35 kilograms (<35 kg).

3100B

The 3100B model is used for all other people greater than 35 kilograms.

Bias flow

Bias flow – Adjusting bias flow will affect mean Paw. Lowering bias flow may decrease work of breathing and facilitate weaning.

Typical ranges
  • Premature 8–15 LPM
  • Nearterm 10–20 LPM
  • Small child 15–25 LPM
  • Large Child 20–30 LPM

    • Adjust

    Adjust – Sets the mean airway pressure. This control directly affects lung volume and oxygenation.

    Typical ranges
  • Initial setting is slightly higher than was observed during conventional ventilation.

    • Power

    Piston displacement is controlled by the power setting. Power changes ventilation and thereby changes blood PaCO2 levels.

    Typical values
  • Start with a power of 2.0 and adjust for chest wiggle to umbilicus

    • Inspiratory time %

    Ti% is the percentage of time allotted for inspiration. Once this value is set, it is rarely changed.

    Typical values
  • 33% is recommended by the manufacturer for almost all applications.
  • up to 50% is recommended in situations where lung recruitment is necessary.
  • any Inspiratory Time above 33% can cause air trapping and lead to barotrauma. Setting the Mean airway pressure 1–2 cm of h2O above the set MAP for a few minuets, then weaning back down to the original MAP can recruit alveoli safely.

    • Frequency

    Frequency (Rf) is the number of breaths in one second, expressed in hertz (hz). One hertz is equal to 60 breaths per minute. (Rf)

    Typical values and ranges
  • The smaller the patient, the higher the frequency.
  • The larger the patient, the lower the frequency.
    • Changes in frequency
  • Decrease in frequency = increased tidal volume.
  • Increase in frequency = decreased tidal volume.

    • Problems

    Since neither the 3100A or the 3100B measure actual tidal volumes, it is impossible to wean with precision; some clinicians find this to be problematic in the application of oscillatory ventilation.

    References

    SensorMedics high-frequency oscillatory ventilator Wikipedia
    (Text) CC BY-SA