Archives of internal medicine . e curve was made of two elements, the firstlong and gradual and the second abrupt and short. The second part occurredwhen full costal expansion had been reached and appeared to be due to a con-traction of the diaphragm. During a slight struggling that occurred when theanesthesia was light, the pressure even at its lowest point (i. e., during expira-tion), kept above zero. Apparently the returning tone of the abdominal musclesallowed positive pressure to prevail even against the negative pull of the obstructing the trachea the first long inspiratory eff
Archives of internal medicine . e curve was made of two elements, the firstlong and gradual and the second abrupt and short. The second part occurredwhen full costal expansion had been reached and appeared to be due to a con-traction of the diaphragm. During a slight struggling that occurred when theanesthesia was light, the pressure even at its lowest point (i. e., during expira-tion), kept above zero. Apparently the returning tone of the abdominal musclesallowed positive pressure to prevail even against the negative pull of the obstructing the trachea the first long inspiratory effort resulted in a greatdrop in pressure, the pressure remaining well below zero until the following greatexpiratory movement caused a rise, and then on releasing the trachea a still fur-ther rise in pressure occurred as the inrush of air into the lungs satisfied thenegative pressure which had been operative in causing unnatural low pressurein the abdomen (Fig. 3). Ill V\/V\fV\| VV\N^^^^ !^^ .^,^^^^„ ^^ ^^ ^ . ^^ ^^^^^^^ mmm^m. Fig. 7.—Experiment 8, continued. I, effect of moderate narcosis. II, deepnarcosis. III. recovery from ether narcosis. Upper line intra-abdominal pres-sure: middle line abscissa; lowest line, time in fifths of a second. Reduced totwo-thirds. Experiment 5.—Nov. 26, 1904: A large powerful cat of unusual musculardevelopment was used. Ether anesthesia. When inserted through four differentplaces in the abdominal wall the trocar registered positive pressure at eachpoint (Fig. 4). The urinary bladder was finally entered by mistake and furtherobservations were unreliable. Experiment 6.—Nov. 29, 1904: Small fox terrier which had been anesthetizedby ether at 2:15 p. m. and had been operated on for demonstration of localizationof brain function and was kept continuously under ether until 3:45 p. m., whenthese observations were made. There was, as is apt to be the case after severecerebral operations have been performed, extreme muscular relaxation. Theanimal
Size: 2310px × 1082px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidarchi, booksubjectmedicine
