“…When the DLT is in the wrong position, there may be risks such as hypoxaemia, airway damage, and poor lung collapse. FOB examination is the most effective method for DLT positioning at present, but the clinical use of FOB in primary hospitals has certain limitations, and FOB examination cannot be used for continuous monitoring during surgery [ 12 , 13 ]. Therefore, this study analysed the application of P peak combined with P ET CO 2 monitoring in DLT localization.…”