The purpose of this study is to assess the effect of quantitative block monitoring versus less expensive qualitative monitoring treatment effects on the lowest SpO2/FiO2 ratio in the PACU. The results will be incorporated into an enhanced recovery pathway for surgical patients.
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lowest SpO2/FiO2 ratio in the PACU (constant for at least 10 minutes)
Timeframe: During the time in PACU (about 30 minutes to 6 hours)