At the Chicago meeting of the American Medical Association in 1908, a symposium on thoracic surgery was presented before the Section on Surgery. The value of differential pressure in thoracic operations was the chief topic of the symposium. The experience of the readers at that symposium had been essentially experimental; they had been performing operations on animals which, previous to the employment of apparatus, had been regarded as impossible.
In the four years which have since elapsed, many thoracic operations on human beings have been done under the different forms of plus and minus pressure, and another equally successful method—intratracheal insufflation—has been introduced.
Apparatus has been used in many of these operations to test the efficiency of a given method or mechanism, although such operations had previously been successful without apparatus. It has been employed by some surgeons as a routine in thoracic cases, sometimes, perhaps,
ROBINSON S. THE SURGERY OF CHRONIC INFECTIOUS DISEASES OF THE LUNG. JAMA. 1912;LIX(4):269–272. doi:10.1001/jama.1912.04270070268009
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