Do Physical Signs Reflect the Degree of Airflow Obstruction in Patients with Asthma or Chronic Obstructive Pulmonary Disease?

Abstract

The aim of the study was to relate the physical signs of the chest to the degree of airflow obstruction in asthma and COPD. Methods: 113 patients with COPD and 76 patients with asthma were recruited from general practice. A standard physical examination of the chest was performed by trained medical students. Physical signs were related to the degree of airflow obstruction. Results: the signs correlating closely with the degree of airflow obstruction were: a prolonged expiratory phase, low-standing diaghragm, decreased expiratory breath sounds, noisy inspiratory sounds, and decreased diaphragmatic excursions. There was a fair correlation between the number of physical signs and the degree of airflow obstruction. This was especially the case in asthma (r=0.62), but it was less clear in COPD (r=0.45). Sensitivity of separate physical signs to detect airflow obstruction was less than 50%, but at least one of the signs was present in 70% of the patients with obstruction. Specificity of separate signs was more than 85%, apart from wheezing in asthma. Conclusion: the combination of physical signs can offer relevant information in monitoring the severity of airflow obstruction in asthma and COPD.