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Pressure control ventilation: three anesthesia ventilators compared using an infant lung model.

S A Stayer1, S T Bent, B S Skjonsby

  • 1Department of Anesthesiology, Baylor College of Medicine, Texas Children's Hospital, Houston, Texas 77030, USA. sstayer@bcm.tmc.edu

Anesthesia and Analgesia
|October 26, 2000
PubMed
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Performance differences exist among ventilators during pressure control ventilation. The NAD 6000 demonstrated more accurate tidal volume delivery compared to the Servo 900C and Aestiva 3000 in an infant test lung model.

Area of Science:

  • Mechanical Ventilation
  • Pediatric Respiratory Care
  • Medical Device Engineering

Background:

  • Pressure control ventilation is crucial for neonatal and pediatric respiratory support.
  • Accurate delivery of tidal volume (V(t)) is essential for patient outcomes.
  • Different ventilator models may exhibit varying performance characteristics.

Purpose of the Study:

  • To compare the performance of three ventilators (Servo 900C, Aestiva 3000, NAD 6000) during pressure control ventilation.
  • To evaluate ventilator accuracy in delivering tidal volume at near-maximum settings for neonatal and pediatric patients.
  • To assess the impact of varying respiratory rates and inspiratory times on ventilator performance.

Main Methods:

  • Three ventilators were tested using an infant test lung model.

Related Experiment Videos

  • Ventilators were set to deliver pressure control ventilation at peak inspiratory pressures (PIP) of 30 cm H2O and 60 cm H2O.
  • Tidal volume delivery and accuracy were measured under different respiratory settings.

    • Main Results:

    • The NAD 6000 delivered an average V(t) 5.8 mL less than the Servo 900C, while the Aestiva 3000 delivered 18.9 mL less (P < 0.001).
    • The Servo 900C tended to overshoot set PIP, particularly at rapid rates and short inspiratory times.
    • The Aestiva 3000 failed to achieve set PIP under certain conditions, whereas the NAD 6000 showed less sensitivity to inspiratory time changes. All ventilators overestimated expiratory V(t), with NAD 6000 being the most accurate.

    Conclusions:

    • Significant performance variations exist among ventilators when using pressure control ventilation in an infant test lung model.
    • The NAD 6000 demonstrated superior tidal volume accuracy and stability compared to the Servo 900C and Aestiva 3000.
    • Clinical selection of ventilators for pediatric patients should consider these performance differences to ensure optimal respiratory support.