Fig. 2.

CO intoxication phase. 1 Pig. 2 Anesthesia with propofol 2%. 3 Spontaneous breathing through endotracheal tube. 4 Gas source containing CO 940 ppm. 5 Balloon with gas reserve for inhalation. 6/7 One-direction valve. 8 Exhaled gas scavenger. 9 Gas evacuation outside the room. 10 Pneumotachograph and FiO₂ measurement. After the intoxication phase, the endotracheal tube was kept in the same position and was covered by an adapted facial mask connected to the respiratory device (Fig. 1)