At the meeting of the Philadelphia and New York Academies of Surgery1 in February, 1928, we reported the reproduction of massive atelectasis in a dog after injecting into the main bronchus of the right lung the obstructing bronchial secretion obtained by bronchoscopic drainage from the main bronchus of the left lung of a patient suffering from this condition (supplied by Dr. Clerf).
That bronchial obstruction is a cause of atelectasis was shown experimentally by Mendelsohn, in 1841, and again by Lictheim, in 1878. The work of Chevalier Jackson with foreign body obstruction of the bronchi has established the clinical phases of this phenomenon beyond all possibility of controversy. The similarity of the atelectasis produced by foreign body obstruction, described by Jackson, to that of postoperative massive atelectasis suggests similar causative factors. Elliott and Dingley, in 1914, accepted this explanation of obstructive atelectasis, and Leopold and Lee, in 1924, Churchill, in