Delay in increase of delivered oxygen during resuscitation

During neonatal resuscitation, when positive pressure ventilation is delivered through a T-piece resuscitator and the fraction of inspired oxygen is increased at the oxygen blender, it may take some time before the infant actually receives the increased FiO2.  In a study conducted in a simulation setting, the time between increasing the FiO2 at the oxygen blender and the increase in FiO2 at the end of a T-piece resuscitator was estimated at different gas flow rates ranging from 5 – 10 liters per minute. There was approximately a 30-second delay until the FiO2 reached the set level at the end of the T-piece resuscitator. The higher flow rates were associated with a shorter delay.

Time needed to achieve changes in oxygen concentration during resuscitation. Follett et al, 2015