In a previous article, by the present writer in conjunction with R. D. Bell,1 evidence was presented to show that in the normal thorax the pressure relationships are always practically equal in both pleural cavities and that therefore the prevalent conceptions of collapse of one lung and maintenance of respiration with the other in the condition of open pneumothorax are incorrect. In the same article also, it was shown that a bilateral open pneumothorax in a normal chest is practically no more dangerous to life than a unilateral opening unless the combined areas of the openings on both sides are greater than the area of the single opening on one side. Both theoretically and experimentally effects of practically the same severity result in the case of one or more openings into one pleural cavity as follow the creation of a double pneumothorax, provided that in each case the combined
GRAHAM EA. THE MAXIMUM NONFATAL OPENING OF THE CHEST WALL. JAMA. 1919;73(26):1934–1935. doi:10.1001/jama.1919.02610520024013
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