File:American journal of physiology (1898) (14595838107).jpg

Identifier: americanjourn01ameruoft (find matches)
Title: American journal of physiology
Year: 1898 (1890s)
Authors: American Physiological Society (1887- ) American Physiological Society (1887- ). Abstracts of papers presented at the fall meeting American Physiological Society (1887- ). Proceedings
Subjects: Physiology Physiology
Publisher: (Bethesda, Md., etc.) American Physiological Society (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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ce with this methodknows how unsatisfactory it is. In many cases a piece of the lungis firmly sucked into the cannula, or if the opening in the chest is X Proceedings of the American Physiological Society. made in the sixth intercostal space, or lower, it often happens thateven the diaphragm is sucked into it. With the aid of my pleuralcannula I have demonstrated on a rabbit a simple method for theredistention of the collapsed lung, and the re-establishing of negativepressure in the pleural cavity. The protruding nozzle of the cannulais connected with a Miillers valve. Then the hand is placed uponthe abdomen, and the stomach and the liver are pressed into thethorax while the trachea is being compressed. As the air of thecompressed, non-collapsed lung cannot escape through the trachea,it enters into the collapsed lung and distends it. By this distention,and by the pressure from below, the air is driven out of the perfo-rated pleural cavity, while the valve prevents the entrance of air.
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Figure i. When now the stopcock of the cannula is closed, the tube leadingto the valve removed, and the nozzle connected with a manometer,the latter immediately shows a negative pressure. In the experi-ment illustrated by Fig. i the nozzle of the cannula was connectedwith a Mareys tambour. The straight line was drawn under normalatmospheric pressure; all above the line is at positive, and all belowat negative pressure. The undulations at the left were obtained fromthe pleural cavity while it contained air. The expiration was alwayspositive. Then the lung was distended, and the air driven out bythe method described above, and the cannula again connected witha Mareys tambour. Both expiration and inspiration were now belowthe line of the atmospheric pressure. Tenth Annual Meeting. xi ON CERTAIN CHARACTERISTICS OF THE PRESSURESENSATIONS OF THE HUMAN SKIN. By G. p. CLARK. Von Frev has shown that the effectiveness of non-painful me-chanical stimuli, in exciting the so-called sense of pressu

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