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. Author manuscript; available in PMC: 2020 Mar 10.
Published in final edited form as: Crit Care Med. 2020 Mar 1;48(3):e200–e208. doi: 10.1097/CCM.0000000000004141

Figure 6.

Figure 6

Pao2/Fio2 (P/F) values associated with atelectasis and blood volume redistribution. Effect of atelectasis (A) and intra-tidal normalized blood volume redistribution toward the dependent region (B) upon P/F ratio. P/F ratio was negatively correlated with both measures in a nonlinear fashion (Spearman ρ = −0.93 and −0.77, respectively) and the log-transform of P/F ratio was linearly related to atelectasis (r2 = 0.87). Box-and-whisker plots represent median, interquartile range and range for the three different fractional atelectatic mass in expiration (FAMexp) groups studied (A) and between those conditions that demonstrated either an inspiration-related reduction or increase in blood volume in the dependent region (B).