Additional file 1 of There is no evidence that carbon dioxide-enriched oxygen before apnea affects the time to arterial desaturation, but it might improve cerebral oxygenation in anesthetized obese patients: a single-blinded randomized crossover trial

Additional file 1: Supplemental information S1. shows the time difference to reach the lowest tissueoxygenation index (TOI = regional oxygen saturation, SrO2) value inboth treatment arms. Time of the O2/Air treatment has beensubtracted from the corresponding apnea time after O2/CO2treatment. Positive values indicate a longer apnea time to reach the lowest TOIvalue after O2/CO2treatment, negative values indicate ashorter apnea time apnea (A). In the subsequent figures, the course ofTOI during apnea after O2/Air and after application of O2/CO2is depicted for all individuals (B). The red lines indicate O2/Airtreatment, turquoise lines indicate O2/CO2 treatment, thefirst intervention is shown in solid, the second intervention in dashed lines.The blue line indicates the lowest TOI value, that was measured in bothtreatment groups.