Fig. 2From: Respiratory support with nasal high flow without supplemental oxygen in patients undergoing endoscopic retrograde cholangiopancreatography under moderate sedation: a prospective, randomized, single-center clinical trialSequence of PtcCO2 value of each group throughout this study. PtcCO2 values are presented as means. LFO: Low-flow oxygen via a nasal cannulaBack to article page