The assessment of airflow obstruction. Role of measurements of airways resistance and of tests of forced expiration.

Airway Obstruction/diagnosis Airway Resistance Asthma/diagnosis Bronchi/physiopathology Bronchitis/diagnosis Chronic Disease Humans Lung/physiopathology Lung Compliance Pulmonary Emphysema/diagnosis Pulmonary Ventilation Respiration Respiratory Tract Diseases/diagnosis Spirometry Trachea/physiopathology Work of Breathing