咳嗽時の気道動態

抄録

High speed cinebronchographic studies were performed on ten patients complaining of cough. Five patients showed no or mild abnormalities on their bronchograms and others suffered from chronic obstructive lung diseases. Motion pictures were taken at a speed of a hundred frames per second. A frame-by-frame measurement was made of the transverse diameter of airways during three voluntary coughs in each patient, and the average value of the three was taken as his value.
Airway narrowing of trachea and large bronchi during coughing occurred extremely rapidly, usually in less than thirty milliseconds. This rapid narrowing tendency of large airways did not depend on the severity of disease. Maximum reduction in the diameter of trachea and main bronchus was 33.7±4.8% and 28.6±7.1%, respectively. Changes in the main bronchus and segmental bronchi during cough were parallel (r=0.73), while the relation between changes of main bronchus and those of subsegmental bronchi was more variable (r=0.47).