Ventilation Task Force Outcomes
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The infant receives mandatory controlled breath of 30 bpm
The infant also receives additional support for the extra 20 bmp
In this case all the supported breaths are triggered
If the infant stops breathing, the 30 bpm of controlled breath will be delivered.
The support during the 50 bpm is PIP (PC + PEEP) = 25
The IT for the 50 breaths is the same = 0.4 seconds
The tidal volume delivered is constant
If the PaCO2 is low, an acceptable way to wean the ventilatory support would be to lower the rate from 30 to 25 bpm
If the PaCO2 is low, an acceptable way to wean the ventilatory support would be to decrease the PC from 20 to 18
If the rate was lowered to 20bpm it will have no effect on the amount of support as long as the infant is breathing > 20 bpm
If the rate was lowered to 20bpm it will lower the support during apneas, if the infant is vulnerable to develop apneas
More than before the switch
the infant spontaneous breaths above the rate of 30 bpm will be supported by 15+5=20 cm H2O
All the 50 bpm will be supported by 25 cm H2O if not triggered by the infant but will be supported by 20 cm H2O if triggered by the infant.
The tidal volume will be closely the same for all the 50 breath
The tidal volume will likely to be higher during the 30 PC breaths than the 20 PS breath
The tidal volume remains constant as long as no change in the ventilator settings regardless of changes in lung compliance
If the compliance correction factor is off the acceptable eTV is ~ 10 ml/kg
If the compliance correction factor is on the acceptable eTV is 4-6 ml/kg
One can measure actual iTV and eTV by adding the sensor to the ETT and in this case the acceptable eTV would be 4-6 ml/kg
Do you think that this survey serves as a good tool to evaluate understanding of the modes of ventilation?
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