Table 1. Standard Protocol Items: Recommendations for Interventional Trials (SPIRIT) Schedule for enrollment, interventions, and assessments. T0: after entering the operating room, T1: 5 minutes after starting mechanical ventilation in the supine position, T2: 60 minutes after turning over, and T3: 5 minutes after taking in the supine position, T4: after breathing air in PACU for 20 minute
