THE successful practice of artificial I pneumothorax in pulmonary tuberculosis requires the complete co-operation of the clinician and the roentgenologist. So necessary is this that it is impossible to carry the treatment to a successful conclusion without careful roentgenologic studies throughout the long period required for pneumothorax therapy. With this in mind, it behooves us as roentgenologists to have a thorough knowledge of the various phases in the treatment so as to assist accurately the clinician in the handling of the various problems that constantly arise under collapse therapy. While pneumothorax treatment has been in general use in sanatoria for the past twenty years, yet it is only recently that its use has spread to the clinic and the private office. Because of this widespread utilization, we are bound to come more and more in contact with this type of therapy. The basic principle in the treatment of pulmonary tuberculosis is rest. Pneumothorax is essentially the application of rest in the localized manner to the affected area of the lung, and thus it enhances the already accepted value of generalized rest. This localized rest to the lung under artificial pneumothorax is the result of a collapse of the lung, and not compression. Modern technic calls for a maintenance of an intrapleural pressure that is slightly less than atmospheric pressure at any time during quiet respiration, and may therefore be termed “collapse therapy.” The effects of this collapse are many, and the clinical improvement in many cases is astounding. From a mechanical point of view there are two distinct results. First, it permits the normal tendency of pulmonary elastic and connective tissues to contract and shrink, and second, if the collapse is sufficiently great, it will bring in apposition cavity walls, and thus facilitate the healing and obliteration of these excavations. Physiologically, the contracted lung shows a certain degree of passive hyperemia with a relative ischemia, and accompanying this is a distinct impedance of the lymphatic drainage. A combination of all these factors results in a marked decrease in the absorption of tuberculous toxins and a tendency to proliferation of connective tissue. The closure of cavities with consequent decrease in expectoration and eventual elimination of positive sputum relieves the patient of the constant danger of further bronchiogenic spread. It is not within the scope of this paper to discuss the technic of insufflation, but it is interesting to note that, despite the type of gas which may be insufflated into the pleural space, it is soon converted by gaseous exchange with the blood to a mixture consisting of 4 per cent oxygen, 6 per cent carbon dioxide, and 90 per cent nitrogen (1). I have used oxygen, nitrogen, and air at different times in pneumothorax treatments, and have come to the conclusion that there is no advantage in using any other gas but air.
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