Fig. 4: Oxygen gas absorption (O2 PC) across different respiratory phases, tidal volume, and inspired fractional oxygen.
From: Breath-by-breath lung gas volume detection using GASMAS in a neonatal mannequin
a and d O2 PC (mean, SD) for a range of different tidal volumes (2–6 ml) (see legend) over time (breath phases) and FiO2 (0.21 – first row, 1.00 – second row). Each data point represents the average value of the four breath cycles. b and e Estimated marginal means for O2 PC for inspiration vs expiration and FiO2 (0.21 – first row, 1.00 – second row). The respiratory rate was set to deliver 20 breaths per minute with the duration of the inspiration phase of 2 s (shaded in green) and the expiration – 1 s (shaded in red). c and f The difference (Δ) of O2 PC between the two breath phases (inspiration and expiration) at the two FiO2 values (0.21 – first row, 1.00 – second row) as a function of the tidal volume. PC projected concentration, FiO2 fraction of inspired oxygen, H2O water vapor, O2 oxygen gas.
