. Surgery, its principles and practice . owder, shimose, or lyddite, pro-duces a complex gas which variouslyaffects all who come within the radiusof its influence. Some are suddenly prostrated in unconsciousness;*^^ others experience an exhilaration atfirst, followed by partial loss of consciousness. At least there are sen-sations of weakness, nausea, and asphyxiation.^*^ The absorption of thecompounds of nitrogen—nitrites and nitrous acid—is probably respon-sible for these symptoms. Recovery may be rapid, but it usualh^ takesdays before all symptoms have disappeared. Other effects of the inha
. Surgery, its principles and practice . owder, shimose, or lyddite, pro-duces a complex gas which variouslyaffects all who come within the radiusof its influence. Some are suddenly prostrated in unconsciousness;*^^ others experience an exhilaration atfirst, followed by partial loss of consciousness. At least there are sen-sations of weakness, nausea, and asphyxiation.^*^ The absorption of thecompounds of nitrogen—nitrites and nitrous acid—is probably respon-sible for these symptoms. Recovery may be rapid, but it usualh^ takesdays before all symptoms have disappeared. Other effects of the inhala-tion of the products of combustion are those caused by the irritativeaction of gases on the respiratory tract. (Edema pulmonalis is one ofthe dreaded consequences.^^ Important in the list of these vague disor-ders and the one meriting special mention in this chapter is that commonlyknown as blast concussion, which is produced among the men, partic-ularly gimners, in greater or less degree depending upon their positionVOL. IV—67. Fig. .:;s. onATKi) ;ii i)ii-; i^lGHT , and WoLND OF THE Back with Fhactuee of theRight Scapula, 1058 NAVAL SURGERY. in relation to the guns at the time they are fired. This consists at firstof more or less shock, involving the whole cerebrospinal axis, and a feelingof great depression in the epigastrium, followed by nausea. In somecases there is a vague mental disturbance accompanied by pain in the is probable that the violent shaking suffered is due to the vibrationsof the deck; while the abdominal symptoms develop as a consequence ofthe primary compression and secondary suction effect upon the body,particularly the unresisting abdomen, produced by the air displacementand immediately succeeding partial vacuum incident to the discharge of alarge gun.^^ This condition is not ordinarily of great consequence per se,though capable of far-reaching results, but in that it conduces to the early development of
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