Fig. 2
Changes in ORI and SpO2 during the anaesthetic induction period
Changes in the ORI and SpO2 that occurred during the anaesthetic induction period in the HFNO and FMV groups are shown. ORI and SpO2 during the induction process were analysed using Student’s t-test. **Indicates P < 0.01 when the two groups are compared. The dots represent the mean values, and the top and bottom lines represent the standard deviations. Abbreviations: ORI, oxygen reserve index; SpO2, oxygen saturation; HFNO, high-flow nasal oxygenation; FMV, facemask ventilation; P-1 min, 1 min of preoxygenation; P-2 min, 2 min of preoxygenation; P-3 min, 3 min of preoxygenation; PPF, propofol injection; R-1 min, 1 min after rocuronium injection; R-2 min, 2 min after rocuronium injection; S-intubation, start of intubation trials; C-intubation, completion of intubation