Correlation of oxygenation index and oxygen saturation index in patients undergoing emergency laparotomy under general anaesthesia: A prospective observational study

Oxygenation index (OI) was first investigated as a prognostic tool for acute hypoxemic respiratory failure in pediatric populations and has since been shown to be an independent risk factor for mortality in adults with acute respiratory distress syndrome. In this prospective cohort study, OI and oxygen saturation index (OSI) data of n = 201 adult patients undergoing emergency laparotomy were collected. Statistically significant correlation was found between OI and OSI both after induction of general anaesthesia [r2 = 0.61; p