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Figure 1: Changes in arterial oxygen saturation in both groups. Markers represent mean. Error bars represent SEM. P ≤ 0.05 considered statistically signifi cant; at 10 min (T4), Pvalue was 0.004; at 20 min (T6), Pvalue was 0.018; at 30 min (T8), Pvalue was 0.023; at 65 min (T15), Pvalue was 0.010; and at 70 min (T16), Pvalue was 0.002. P ≤ 0.001 was considered highly statistically signifi cant; baseline, P < 0.001; at induction, P < 0.001; and at 35 min (T9), Pvalue was 0.00 1. 
