Overview

To Assess the Utility of Impulse Oscillometry on a Differential Diagnosis among the Patients with ACOS,asthma and COPD over Age 40.

Eligibility

Inclusion Criteria:

• 1.1 ACOS:
  1. Patient is older than 40 years old.
  2. There are characteristics of bronchial asthma and COPD.
  3. There is a history of exposure to risk factors.
  4. Existence of persistent airflow limitation: After the application of bronchodilators, FEV1/FVC<0.7, and lung function proved reversible exhalation.
  5. The existence of reversible airflow limitation: Bronchial Dilation Test positive.

        1.2Asthma: 1)Patient is older than 40 years old. 2)History of reversible respiratory
        symptoms. 3) non-smokers. 4)lung function:At least one time proved that the airflow
        limitation: Bronchial Dilation Test positive.
        5)previously diagnosed asthma. 1.3COPD:
          1. Patient is older than 40 years old.
          2. Complaints about dyspnea, chronic cough or expectoration.
          3. There is a history of exposure to risk factors.
          4. Existence of persistent airflow limitation: After the application of bronchodilators,
             FEV1/FVC<0.7.
          5. The existence of irreversible airflow limitation: Bronchial Dilation Test negative.
        Exclusion Criteria:
        - 2.1 Combining other respiratory diseases that affect airflow,such as lung cancer,
        tuberculosis, pneumonia and bronchiectasis.
        2.2 At the time doing lung function test, the factors that affect the airflow limitation
        are not stopped or just stopped with the time interval not long enough to meet the test
        standard.
        2.3 Using special accompanying medication. For example, patients with drugs such as
        glucocorticoid.