How to diagnose slow lung resistance

COPD can often be diagnosed by pulmonary function test. The gold standard pulmonary function test for diagnosis of COPD patients. Pulmonary function test of COPD patients will show obstructive ventilation dysfunction, that is, forced vital capacity per second is less than 70%. It is important to note that the above lung function examination needs to be performed after inhalation of bronchodilators. This is because after inhalation of bronchodilators, airway spasms can be relieved, and airway spasms caused by asthma can be ruled out to a certain extent. In addition, patients with chronic obstructive pulmonary disease sometimes need to do chest CT examination. The purpose of chest CT examination is mainly to rule out bronchiectasis, diffuse panbronchiolitis and other related diseases.