Value of Bronchoalveolar Lavage with Acetylcysteine in the Treatment of Bronchiectasis.

Inclusion Criteria: 1. Age ≥18 years and ≤80 years; 2. Chest CT suggestive of bronchiectasis; 3. meet the criteria for an acute exacerbation of bronchiectasis with symptoms such as cough, sputum, chest tightness or wheezing, and c. Patients who meet the criteria for an acute exacerbation of bronchiectasis with symptoms of cough, sputum, chest tightness or wheezing and who consent to bronchoscopy with bronchoalveolar lavage 4. patients who agreed to participate in the study and signed an informed consent form; Exclusion Criteria: 1. Severe cardiopulmonary diseases, coagulation disorders, poor tolerance to anaesthesia, psychiatric disorders or severe neuroses that are contraindications to bronchoscopy; 2. Intraoperative findings of decreased SPO2 or inability to tolerate bronchoscopy or inability to tolerate further bronchoalveolar lavage; 3. Inability to co-operate with the study for any reason or in the opinion of the investigator, inappropriate for inclusion in the study for other reasons; 4. Bronchoscopy of patients with significant intra-airway haemorrhage who may be at risk of exacerbation due to bronchoalveolar lavage; 5. Patients with acetylcysteine allergy; 6. Missing information;