TY  - JOUR
T1  - EFfect of breathing gases under positive pressure on lumens of small and medium-sized bronchi
AU  - BARACH AL, SWENSON P
Y1  - 1939/05/01
N1  - 10.1001/archinte.1939.00180220136012
JO  - Archives of Internal Medicine
SP  - 946
EP  - 948
VL  - 63
IS  - 5
N2  - A constriction in any part of the air passages from the glottis to the alveoli causes an additional resistance to the passage of air. This results in an increased effort on the part of the respiratory musculature to ventilate the lungs. When obstruction is present within the thorax, respiration modifies the degree of obstruction, since the lumens of the bronchi enlarge on inspiration and constrict during expiration.1 This variation in size of the smaller bronchi has been demonstrated by roentgenograms of the lungs, made after injection of iodized poppyseed oil.2 In the extrathoracic trachea and larynx, however, the lumen is not exposed to varying intrathoracic pressures; it is, moreover, protected from alteration in its size by strong cartilaginous rings.In asthmatic dyspnea, inspiration is short and forcible, and expiration is prolonged. The long-drawn-out character of expiration may be explained by the constriction of the bronchi during the expiratory
SN  - 0730-188X
M3  - doi: 10.1001/archinte.1939.00180220136012
UR  - http://dx.doi.org/10.1001/archinte.1939.00180220136012
ER  -