Assessment of high-frequency neonatal ventilator performances

Area of Science:

• Neonatal critical care medicine
• Respiratory physiology
• Biomedical engineering

Background:

• Neonatal high-frequency ventilation (HVF) is crucial for treating respiratory distress in premature infants.
• Assessing the performance and reliability of different HVF devices is essential for optimizing patient care.

Purpose of the Study:

• To evaluate the efficacy and reliability of three neonatal high-frequency ventilators.
• To compare tidal volume delivery across different settings and patient conditions.

Main Methods:

• Bench evaluation of three neonatal high-frequency ventilators (HFV-Babylog 8000, OHF 1, SensorMedics 3100A) using a neonatal test-lung.
• Measurements included tidal volume, peak-to-peak pressure, and mean airway pressure under varying ventilator settings, endotracheal tube sizes, and lung compliances.

Main Results:

• Two ventilators (OHF 1, SensorMedics 3100A) delivered adequate tidal volumes at 15 Hz, irrespective of endotracheal tube size or lung mechanics.
• The HFV-Babylog 8000 showed reduced tidal volume delivery above 50% pressure amplitude and with decreasing mean airway pressure.
• Tidal volume increased with endotracheal tube size for all ventilators; only OHF 1 showed decreased tidal volume with increased lung compliance.

Conclusions:

• Two of the three tested neonatal ventilators demonstrated reliable tidal volume delivery under standard conditions.
• Ventilator-specific responses to changes in lung compliance and mean airway pressure may contribute to unexplained hypercapnia in neonates during recovery from conditions like hyaline membrane disease.