BRONCHIAL CALIBRE CHANGES IN BRONCHIECTASIS 1

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Abstract
The calibre changes in the bronchi of normal individuals and in cases of "wet" and "dry" bronchiectasis were studied by the method of Heinbecker. Whereas the normal bronchi dilated upon inspiration and constricted upon expiration, the affected bronchi in the "wet" cases did not change in calibre. Particularly notable was the lack of constriction on deep expiration. The bronchi of cases made "dry" likewise did not change in calibre at the extremes of respiration and remained in the ectatic state. The results of these studies support the opinion that well-established bronchiectasis is an irreversible condition and that surgery is indicated for cure. By this method of investigation early cases in which the marked destruction of the flexible elements of the bronchial walls has not as yet occurred, might be recognized by the fact that the bronchi remain capable of changing in calibre at the extremes of respiration. Such cases could be treated conservatively instead of surgically.