Fig. 1

Oxygenation and oxygen delivery for ultraprotective and apneic ventilation and three different fractions of inspired oxygen. A Arterial oxygen saturation; SaO₂, arterial oxygen saturation, FiO₂, fraction of inspired oxygen. B Arterial partial pressure of oxygen. PaO₂, arterial partial pressure of oxygen, FiO₂, fraction of inspired oxygen. C Cardiac output, FiO₂, fraction of inspired oxygen. D Oxygen delivery. FiO₂, fraction of inspired oxygen, brackets denote statistically significant differences between ventilation strategies, p-values are shown above the brackets. a: p < 0.05 ultraprotective ventilation with a FiO₂ of 21% vs. ultraprotective ventilation with a FiO₂ of 50%; b: p < 0.05 ultraprotective ventilation with a FiO₂ of 21% vs. ultraprotective ventilation with a FiO₂ of 90%; c: p < 0.05 ultraprotective ventilation with a FiO₂ of 50% vs. ultraprotective ventilation; with a FiO₂ of 90%; d: p < 0.05 apneic ventilation with a FiO₂ of 21% vs. apneic ventilation with a FiO₂ of 50%; e: p < 0.05 apneic ventilation with a FiO₂ of 21% vs. apneic ventilation with a FiO₂ of 90%; f: p < 0.05 apneic ventilation with a FiO₂ of 50% vs. apneic ventilation with a FiO₂ of 90%