Author: Micha Sam Brickman Raredon; Clark Fisher; Paul Heerdt; Ranjit Deshpande; Steven Nivison; Elaine Fajardo; Shamsuddin Akhtar; Thomas Raredon; Laura E. Niklason
Title: Pressure-Regulated Ventilator Splitting (PReVentS): A COVID-19 Response Paradigm from Yale University Document date: 2020_4_6
ID: mqj071gp_92
Snippet: • As the circuit is currently designed, negative circuit pressure near the patient will entrain room air through the negative-pressure relief valve -this will briefly decrease the FiO2 following in-line suctioning, or if the patient makes strong respiratory effort during the ventilator's expiratory phase. If even a brief FiO2 decrease is unacceptable for a patient, an oxygen reservoir bag should be added at the negative pressure relief valve. W.....
Document: • As the circuit is currently designed, negative circuit pressure near the patient will entrain room air through the negative-pressure relief valve -this will briefly decrease the FiO2 following in-line suctioning, or if the patient makes strong respiratory effort during the ventilator's expiratory phase. If even a brief FiO2 decrease is unacceptable for a patient, an oxygen reservoir bag should be added at the negative pressure relief valve. With proper forethought, steps can also be taken to mitigate FiO2 drop during in-line suctioning (see below). • While not intrinsic to the PReVentS circuit, with the current hand-made valves it is necessary to briefly open the circuit to make valve adjustments. During this maneuver, ventilation is still maintained for the other patient, and PEEP is maintained for both patients. We are currently iterating on valve design to allow pressure adjustment without any circuit disruption.
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