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. 2021 Mar 2;160(1):175–186. doi: 10.1016/j.chest.2021.02.047

Figure 3.

Figure 3

Description of how ventilator performance was assessed during CPAP. The onset of pressure regulation allows measurement of the regulation delay and the flow to regulation, and calculation of the equivalent PTPt. The maximal delivered pressure and the tidal volume were measured from the ASL 5000 airway pressure and piston volume. Pmus = muscular pressure; PTPt = inspiratory pressure-time product.