Objective  To observe the application effect of visual double-lumen bronchial catheter in tracheal intubation and lung isolation in obese patients with thoracotomy.

  Methods  A total of 55 obese patients with lung cancer were selected, and were randomly divided into visual group (n=24) and control group (n=24) after 7 cases were excluded. In the visual group, the patients were performed visual left double-lumen bronchial catheter, and those in the control group were given left double-lumen bronchus catheter. The changes of mean arterial pressure (MAP), and heart rate (HR) in two groups were compared at the time points of catheter placement, 5 min before administration (T₁), immediately before induction (T₂), immediately after double lumen bronchial catheter placement (T₃), 3 min after implantation (T₄), and 5 min after implantation (T₅). Intraoperative catheter displacement, tracheal injury, postoperative pharyngeal pain and hoarseness were compared between the two groups.

  Results  Compared with the visual group, the tracheal intubation time and repositioning time after translocation of endotracheal intubation were significantly shorter, and injury of trachea and bronchus was lighter than those of the control group (P < 0.05). Compared with the visual group, The incidence rates of postoperative pharyngeal pain and hoarseness in the visual group were significantly lower than those in control group (P < 0.05). At T₃, MAP and HR in the visual group were lower than those in the control group(P < 0.05).

  Conclusion  Visible double-lumen bronchus can significantly shorten the time of tracheal intubation, reduce the fluctuation of MAP during tracheal intubation, alleviate tracheobronchial injury, and reduce incidence of postoperative pharyngeal pain and hoarseness.