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Example of continuous intraoperative oxygen reserve index trend (ORI; black line), continuous pulse oxygen saturation trend (Spo2; green line), and intermittent arterial partial pressure of oxygen determination (Pao2; red diamonds) obtained during surgery. ORI was zero at times when low Pao2 was measured and Spo2 was recorded at 96% and then increased over time as Pao2 and Spo2 increased.
