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High-frequency oscillatory ventilation with volume guarantee: a single-centre experience.

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High-frequency oscillatory ventilation with volume guarantee (HFOV-VG) in neonates maintains target tidal volumes over time. While short-term VThf varies, it is stable long-term, with high volumes rarely needed.

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Area of Science:

  • Neonatology
  • Pediatric Critical Care
  • Respiratory Physiology

Background:

  • High-frequency oscillatory ventilation (HFOV) is a standard treatment in neonatal intensive care.
  • The Dräger Babylog VN500 ventilator introduced a volume-guaranteed HFOV (HFOV-VG) mode, allowing for precise setting of high-frequency tidal volume (VThf).

Purpose of the Study:

  • To evaluate the short-term and long-term accuracy of VThf delivery using HFOV-VG in neonates.
  • To assess the impact of HFOV-VG on other ventilator parameters and blood gas levels.

Main Methods:

  • Analysis of approximately 3.2 million seconds of ventilator data from 17 neonates on HFOV-VG.
  • Utilized Python for data processing and analysis of ventilator parameters at a 1 Hz sampling rate.

Main Results:

  • The median delivered VThf was 1.93 mL/kg, with 83% of measurements showing a difference <0.2 mL/kg between set and delivered volumes.
  • VThf exhibited short-term variability but was consistently close to the target when averaged over 5-minute intervals.
  • A weak inverse correlation was observed between weight-corrected VThf and PaCO2 (r=-0.162, p=0.01).
  • High VThf (>2.5 mL/kg) was infrequently associated with hypercapnia (PaCO2 >8 kPa in 11% of cases).

Conclusions:

  • HFOV-VG effectively maintains target tidal volumes in neonates over the longer term, despite short-term fluctuations.
  • VThf or DCO2 showed a poor correlation with CO2 levels, indicating limited predictive value for ventilation adequacy.
  • Delivery of VThf exceeding 2.5 mL/kg is rarely necessary for adequate ventilation in this population.