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Higher Fresh Gas Flow Rates Decrease Tidal Volume During Pressure Control Ventilation.

Shazia Mohammad1, Nikolaus Gravenstein, Drew Gonsalves

  • 1From the *Department of Anesthesiology, University of Florida, Gainesville, Florida; †Center for Safety, Simulation & Advanced Learning Technologies, University of Florida, Gainesville, Florida; ‡Department of Orthopaedics and Rehabilitation, University of Florida, Gainesville, Florida; and §Clinical & Translational Science Institute Simulation Core, UF Health Shands Experiential Learning Center, University of Florida, Gainesville, Florida.

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Summary
This summary is machine-generated.

Increasing fresh gas flow (FGF) significantly decreased exhaled tidal volume (VT) during pressure control ventilation (PCV) in a pediatric lung model. This previously undescribed interaction highlights potential risks when adjusting FGF during infant ventilation.

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Area of Science:

  • Anesthesiology
  • Pediatric Critical Care
  • Respiratory Mechanics

Background:

  • Fresh gas flow (FGF) is a critical parameter in mechanical ventilation.
  • The impact of FGF on exhaled tidal volume (VT) during pressure control ventilation (PCV) is not well-documented.
  • Unintended changes in VT can have significant clinical implications, especially in pediatric patients.

Purpose of the Study:

  • To investigate the relationship between FGF and exhaled VT during PCV.
  • To determine if changes in FGF affect VT delivery in a simulated pediatric lung model.
  • To identify potential mechanisms behind any observed FGF-VT interactions.

Main Methods:

  • A pediatric lung model with controlled compliance and resistance was used.
  • Ventilation was delivered using pressure control ventilation (PCV) on two anesthesia machines (Aestiva and Avance CS2).
  • Exhaled VT was measured at various FGF rates (1-15 L/min) while other ventilator parameters were held constant.

Main Results:

  • Increasing FGF significantly decreased exhaled VT in the Aestiva ventilator, with VT reductions up to 79.2%.
  • The GE Avance CS2 showed a less pronounced decrease in VT with increasing FGF.
  • The observed FGF-VT interaction was not previously described in the literature.

Conclusions:

  • Fresh gas flow (FGF) has a significant, underappreciated effect on tidal volume (VT) during pressure control ventilation (PCV) with the Aestiva bellows ventilator.
  • This interaction may be due to inadvertent positive end-expiratory pressure (PEEP) generated by the ventilator's relief valve.
  • Clinical vigilance is recommended when adjusting FGF during PCV in pediatric patients, and further in-vivo studies are warranted.