Application Effect of Lightwand Guided Intubation Technique in Double-Lumen Endobronchial Tube Intubation for High-Risk Patients with Difficult Airway

INTERVENTION: Light stylet group:Endotracheal intubation guided by light stylet;Visual laryngoscope group:Endotracheal intubation guided by video laryngoscope; CONDITION: Thoracic Surgery PRIMARY OUTCOME: Intubation time;Number of intubations;Success rate of one‐time intubation; SECONDARY OUTCOME: Hemodynamic changes before and after intubation;Incidence of intubation‐related complications; INCLUSION CRITERIA: 1.Patients voluntarily participated in this research project; 2. Patients were conscious and had normal communication and could cooperate with airway assessment; 3. underwent elective thoracic surgery under general anesthesia; 4. Patients required placement of a left double‐lumen endobronchial tube for one‐l ventilation; 5. Patients were graded ASA I‐III; 6.The age of the patients was >=18 years old and <=65 years old.