Effect of Disconnecting Pulmonary Vagus Nerve Branch on Chronic Cough After Unilateral Thoracoscopic Lobectomy

Inclusion Criteria: * Patients with preoperative imaging of bronchial lung cancer below the secondary bronchus ,the maximum diameter of the tumor ≤ 5cm (T ≤ 2) and staging check not suggesting distant and mediastinal lymph node metastasis (N ≤ 1, M = 0) schedule to receive elective unilateral thoracoscopic lobectomy from 2019 to 2021 will be included in the trial. * ASAⅠ-Ⅲ Exclusion Criteria: * Chronic cough (\>8 weeks), its causes including chronic bronchitis, asthma, gastroesophageal reflux disease, history of postnasal drip syndrome, and the use of ACEI drugs and so on; * other history of lung surgery; * patients with severe arrhythmia; * there are contraindications for anesthesia and surgery; * pregnancy and lactation.