The purpose of this prospective randomized controlled trial is to determine whether using the Oxygen Reserve Index can prevent hyperoxemia in pediatric patients receiving single-lung ventilation. Participants will have their FiO2 adjusted in a prescribed manner based on the arm to which they are assigned. The researchers will compare whether blood oxygen levels were lower in the ORI group.
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The incidence of moderate to severe hyperoxemia in arterial blood gas analysis at T2 (30 minutes after one lung ventilation)
Timeframe: 30 minutes after initiation of one-lung ventilation