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Carbon dioxide diffusion coefficient in noninvasive high-frequency oscillatory ventilation.

Christoph Schäfer1,2, Stefan Schumann1, Hans Fuchs3

  • 1Department of Anesthesiology and Critical Care, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.

Pediatric Pulmonology
|April 19, 2019
PubMed
Summary
This summary is machine-generated.

The carbon dioxide (CO2) diffusion coefficient effectively indicates ventilation efficacy during noninvasive high-frequency oscillatory ventilation (nHFOV), even with moderate air leaks. This measure remains reliable for assessing CO2 removal in nHFOV settings.

Keywords:
bench studycarbon dioxidecarbon dioxide diffusion coefficientnoninvasive high-frequency oscillatory ventilationnoninvasive ventilation

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Area of Science:

  • Biomedical Engineering
  • Respiratory Physiology
  • Pediatric Critical Care

Background:

  • High-frequency oscillatory ventilation (HFOV) is a critical respiratory support method.
  • Assessing ventilation efficacy, particularly CO2 removal, is crucial during HFOV.
  • Noninvasive HFOV (nHFOV) presents challenges due to potential air leaks, complicating efficacy assessment.

Purpose of the Study:

  • To investigate whether the carbon dioxide (CO2) diffusion coefficient (DCO2) can accurately reflect CO2 removal during nHFOV.
  • To determine if DCO2 remains a reliable indicator of ventilation efficacy despite the presence of oropharyngeal leak flow in nHFOV.

Main Methods:

  • A neonatal airway model with CO2 production and adjustable oropharyngeal leak was utilized.
  • Pressures and gas flows were measured at the prongs, trachea, and leak.
  • DCO2 was calculated using tracheal (DCO2 trachea) and prong (DCO2 prong) measurements and compared with CO2 partial pressure (pCO2) under varying leak conditions.

Main Results:

  • DCO2 trachea strongly correlated with pCO2, irrespective of leak flow.
  • DCO2 prong correlated with pCO2 without and with moderate leak, but not with maximum leak.
  • Calculated tidal volumes (VT) at the trachea and prong levels showed distinct correlations with pressure and frequency, influenced by leak.

Conclusions:

  • DCO2 measured at the airway opening at the prong level is a valid indicator of ventilation efficacy during nHFOV.
  • This metric remains reliable even when moderate oropharyngeal leaks are present.
  • DCO2 serves as a useful tool for monitoring CO2 removal in nHFOV.