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[Experimental study of changes in FiO2 during manual ventilation]
J F Diependaele1, T Rakza, P Truffert
1Smur pédiatrique-Samu de Lille, Lille, France.
Summary
Manual ventilation requires careful control of oxygen concentration. Using a pressure manometer during neonatal ventilation ensures consistent oxygen delivery and prevents lung overdistention.
Area of Science:
- Neonatal Resuscitation
- Respiratory Physiology
- Medical Device Engineering
Context:
- Manual ventilation is crucial for neonates with respiratory distress syndrome (RDS).
- Current recommendations for oxygen flow during manual ventilation lack standardization.
- Achieving precise fraction of inspired oxygen (FiO2) near 1 is critical for effective resuscitation.
Purpose:
- To investigate the impact of ventilatory frequency, inspiratory pressure, and oxygen flow on delivered FiO2 during manual ventilation.
- To determine optimal parameters for achieving FiO2 near 1 in neonatal manual ventilation.
- To evaluate the effect of visual pressure control on FiO2 stability.
Summary:
- In manual ventilation without pressure control, increased oxygen flow and decreased ventilatory rate raised FiO2, with significant operator variability (47-86%).
- Multivariate analysis confirmed independent modulation of FiO2 by oxygen flow, ventilator rate, and operator.
- Implementing visual pressure control reduced mean inflating pressures and made FiO2 independent of oxygen flow and ventilatory rate.
Impact:
- Continuous visual control of airway pressure is recommended for neonatal manual ventilation.
- This device mitigates FiO2 fluctuations caused by ventilatory rate variations.
- It helps prevent lung overdistention during neonatal resuscitation, improving patient outcomes.