Impulse Oscillation to Evaluate Diagnostic Efficacy in Patients With Chronic Airway Disease

Inclusion Criteria: 1. 18-75 years old, no gender limit; 2. The subject voluntarily cooperated with the research and signed an informed consent form; 3. Meet any of the following three criteria: * Patients with asthma, the standard diagnosis of asthma complied with the GINA 2019; ② Patients with COPD, the standard diagnosis of COPD complied with GOLD 2019; ③ The subjects in the healthy control group had normal vital capacity (baseline FEV1≥80% of the predicted value, FEV1/FVC was greater than the Lower Limit of Normal, and with negative result of BPT or BDT). Exclusion Criteria: 1. History of other lung diseases, such as cystic fibrosis, bronchiolitis obliterans, tuberculosis, lung cancer, etc.; 2. After taking corticosteroid therapy in the last 4 weeks, respiratory tract infection occurred within 8 weeks; 3. A history of myocardial infarction and stroke in the past 3 months; a history of severe arrhythmia, severe cardiac insufficiency, and unstable angina in the past 4 weeks, etc.; 4. In the past 4 weeks, severe hemoptysis and epileptic seizures require medication; severe hyperthyroidism; 5. Pregnant women; 6. Other researchers consider it inappropriate.