File:American journal of physiology (1898) (14802182453).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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slightly openduring the artificial respiration, and which I might call the relief stop-cock. Before taking a tracing the following order was observed.First the relief stop-cock was opened fully, then the stop-cock of theartificial respiration was closed and that leading to the tambour wasopened; and, finally, after the lever of the tambour reached its nor- ^ Haycraft, J. B. : The movements of the heart within the chest-cavity andthe cardiogram. Journal of physiology, 1891, xii, p. 447. Nature of the Cardiopfieumatic Movemetits. 125 mal position again, the relief stop-cock was closed and a tracing taken.With these precautions the tambour was under an equal atmosphericpressure inside and outside while registering the movements. If therelief stop-cock was closed before all the surplus air had escaped,the lungs did not thoroughly collapse and the tambour registeredsome movements, although the thorax was open and the attachmentsof the heart thoroughly removed; the movements disappeared as
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Fig. 4. (i) Shows the cardiopneumatic movements in a small dog with chest unopened.(2) Taken after the left pleural cavity was opened, the undulations becoming verysmall. (3) The continuation of tracing 2; closing the opening with a towel caused themovements to increase again. (4) Taken after both pleural cavities were opened;there is only a trace of the movements to be noticed. (5) Taken under the sameconditions, but after the attachments of the heart to the front wall and the diaphragmhad been thoroughly removed. The movements are again considerably increased, butthey differ in character from the normal pneumocardiograms of the same dog, andresemble tracing 2 in Fig. I (from Haycraft and Edie, see above). (6) Taken underthe conditions of tracing 5, but both openings were closed with towels. The size andespecially the character is changed. (7) The towels were removed and the tracingsare once more the same as in 5. soon as the air was permitted to escape thoroughly. These move-ments w

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