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Fig. 3 | BMC Anesthesiology

Fig. 3

From: Comparison of the effectiveness of high-flow nasal oxygen vs. standard facemask oxygenation for pre- and apneic oxygenation during anesthesia induction: a systematic review and meta-analysis

Fig. 3

Forest plots of PaO2 in HFNO versus FMV after preoxygenation and after intubation. Subgroup analysis shows the PaO2 after preoxygenation versus after intubation. CI indicates confidence interval; df, degrees of freedom; HFNO, a high-flow nasal oxygen; FMV, facemask ventilation; IV, inverse variance, 02 oxygen, standard deviation

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