. Modern medicine and bacteriological review. Fig. 3.— Breathing-tube. respiratory pressure, and in different waysaccording to the different morbid changespresent. In diseases in which expansionof the lungs is impaired,— that is, in casesin which the respiratory field is dimin-ished by means of pleuritic adhesions,exudate in the air cells, tubercular infil-tration, or ossification of the cartilages,anything, in fact, which interferes withexpansion, — the inspiratory power isdiminished ; while, on the other hand, inemphysema and asthma, expiration is ab-normally prolonged and expiratory pres-su
. Modern medicine and bacteriological review. Fig. 3.— Breathing-tube. respiratory pressure, and in different waysaccording to the different morbid changespresent. In diseases in which expansionof the lungs is impaired,— that is, in casesin which the respiratory field is dimin-ished by means of pleuritic adhesions,exudate in the air cells, tubercular infil-tration, or ossification of the cartilages,anything, in fact, which interferes withexpansion, — the inspiratory power isdiminished ; while, on the other hand, inemphysema and asthma, expiration is ab-normally prolonged and expiratory pres-sure is diminished ; hence the feeble voiceand weak cough. It is evident that thebreathing-tube should not be used in casesof emphysema and asthma. The following experiments were under-. Kxhaation Tube in Ise. 264 ORIGINAL ARTICLES. taken to show the precise influence of thebreathing-tube upon the expiratory pres-sure and movement: — Experiment i.— This experiment wassimply a repetition of that of Donders,which consists in placing a U-shapedmanometer in one nostril, keeping theother nostril open and the mouth closedwhile breathing quietly. The change inthe level of the mercurial manometershowed a negative pressure of minus onemillimeter during inspiration, and a posi-tive pressure of two to three millimetersduring expiration. Experiment 2.— The purpose of thisexperiment was to determine to what ex- Experiment j.—The purpose of thisexperiment was todetermine the effect ofdiminishing the exit-area by one opening,adjusting the breathing-tube in such amanner as to cover one of the four out-lets. Two trials were made, as follows : — (a) Maintaining the pressure at thesame point as before, namely, ten milli-meters, it was found that the time re-quired for expirati
Size: 1480px × 1688px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectmedicine, bookyear189
