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Mechanical performance of clinically available, neonatal, high-frequency, oscillatory-type ventilators
D Hatcher1, H Watanabe, T Ashbury
1Department of Anaesthesiology, Queen's University, Kingston, ON, Canada.
Critical Care Medicine
|July 11, 1998
Summary
This study evaluated five neonatal high-frequency oscillatory ventilators, revealing significant variations in delivered volumes, waveforms, and pressure measurements. Performance differed greatly, impacting their suitability for neonatal respiratory support.
Area of Science:
- Neonatal respiratory support
- Mechanical ventilation
- Pulmonary physiology
Background:
- High-frequency oscillatory ventilation (HFOV) is a critical mode for neonatal respiratory distress.
- Evaluating the performance of commercially available HFOV devices is essential for optimizing patient care.
- Variability in ventilator function can impact treatment efficacy and safety in neonates.
Purpose of the Study:
- To conduct a functional evaluation of five distinct high-frequency oscillatory ventilators marketed for neonatal use.
- To compare the delivered volumes, waveforms, and pressure measurements across different HFOV devices.
- To assess the impact of varying ventilator settings and lung injury on device performance.
Main Methods:
- An observational animal study was conducted in a laboratory setting using New Zealand White male rabbits.
- Five ventilators (SensorMedics 3100 A, Dräger Baby Log 8000, Metran Humming V, Infant Star, Infant Star 950) were tested.
- Measurements included oscillator waveforms and delivered volumes under varying frequencies, amplitudes, mean airway pressures, and simulated lung injury.
Main Results:
- Delivered volumes varied significantly (2.1 to 8.8 mL at 15 Hz, 100% amplitude), generally decreasing with higher frequency and amplitude.
- Volume delivery was less affected by mean airway pressure but decreased with lung injury.
- Waveforms ranged from sinusoidal to square, with distinct ventilator-specific handling of inspiration/expiration ratios and variable accuracy in mean airway pressure display.
Conclusions:
- Significant variations in machine performance, operational complexity, and versatility were observed among the evaluated neonatal ventilators.
- These differences highlight the need for careful selection and understanding of individual ventilator characteristics for neonatal HFOV.
- Further research is warranted to optimize the use of these devices in clinical practice.