The diagnostic criteria for emphysema

The diagnosis of obstructive pulmonary emphysema in particular, early diagnosis is difficult, in combination with history, signs, chest X-ray and lung function tests comprehensive judgement.

Where an airway obstruction caused diseases such as bronchitis, chronic bronchitis, bronchial asthma, tuberculosis and other medical history, short breath gradually increased, lung function tests showed residual gas and residual gas / lung volume increase, which more than 35 percent, the first seconds Forced expiratory volume / forced vital capacity ratio of less than 60 percent, the largest ventilation or value is expected to account for 80 percent below the uneven distribution of gas, diffusing capacity reduction, the treatment of bronchiectasis, no significant improvement in lung function can be diagnosed To obstructive pulmonary emphysema.