A text-book of practical therapeutics . glass tube partly filled with water, and provided witha scale in millimeters of displacement, should be connected withthe tube, which carries the gas from the container to the branch running to this U-shaped tube should be provided witha two-way cock, as by this means the negative pressure in the chest TUBERCULOSIS 947 cavity after the needle is introduced can be measured and the posi-tive pressure of the gas delivered to the chest can readily be negative pressure fluctuations caused by respiration shouldequal about 10 mm. or more
A text-book of practical therapeutics . glass tube partly filled with water, and provided witha scale in millimeters of displacement, should be connected withthe tube, which carries the gas from the container to the branch running to this U-shaped tube should be provided witha two-way cock, as by this means the negative pressure in the chest TUBERCULOSIS 947 cavity after the needle is introduced can be measured and the posi-tive pressure of the gas delivered to the chest can readily be negative pressure fluctuations caused by respiration shouldequal about 10 mm. or more of displacement in the such fluctuations do not occur the injection is contraindicated,since their absence indicates that the lung is bound to the chest-wall by adhesions and cannot be made to collapse. The positivepressure of the gas should be from 40 to 250 mm. of water but lessthan 250 is better. After the needle is introduced it should bemoved up and down to determine that its point is not engaged inthe lung Fig. 144.—Showing the degree to which the left lung may be compressed by artificialpneumothorax within nineteen days. (Amrein and Lichtenhelm.) Even when nitrogen gas is used so much as 80 to 100 cc may beabsorbed in each twenty-four hours and, therefore, repeated injec-tions must be made to maintain the collapse. This is the wholepoint in the treatment. To repeatedly compress the lung andthen let it expand is harmful. The fluoroscope must be used todetermine when the next dose is needed. As a rule the pressure must be continued several months beforethe lung heals in its collapsed form. Often when the treatment isstopped after some months, and when the patient is so greatlyimproved that it is thought wise to stop, the lung will expand slightly. Finally, it is manifest that the most rigid rules of asepsis must beconstantly adhered to, as a pyopneumothorax may readily be inducedthrough errors in the technique. 948 DISEASES It need hardly be added
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