Studies on the Pulmonary Function in Cardiac Diseases Part II On the Airway Resistance

Abstract

Measurements of airway resistance (AWR) have been attempted in normal subjects and in patients with cardiac disease, using the pressure type body plethysmograph modified to make it possible to change examinee's posture. In the cardiacs AWR was found to be increased as cardiac decompensation progressed, this seemed to be more pronounced in the supine position than the sitting. But the reduced AWR may be induced by inhalation of the bronchodilator. This suggests narrowing condition or spasmodic contraction of the airway, most of which are of reversible entity in the heart disease. Here the related other factors on AWR were also discussed.