File:American journal of physiology (1898) (14595620710).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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re in the aorta, so that the ex-perimenter could be sure that the driving force remained the samethroughout the observation; a membrane manometer, of the Hlirthletype, for recording the changes of pressure in the left ventricle; aMariotte flask, by which the intraventricular pressure could beraised to any height desired; a drop counter, for registering the ^ Magrath, J. B., and H. Kennedy : Journal of exper. medicine, 1S97, ii, p. 13. 2l6 Ida H. Hyde, volume of the coronary circulation; and, finally, a kymograph, witha time recorder. At the beginning of the experiment, two cats were anaesthetizedwith ether, tracheotomized, and bled from the left carotid artery.The blood was defibrinated, filtered through glass wool, and placedin the blood reservoirs to warm. Meanwhile, the front wall of thethorax of the second of the two cats was removed, exposing theheart and great vessels; the ven?e cavse and right vena azygos wereligated; cannulas were placed in the aorta, the left subclavian, pul-
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FlGURE I. monary, and innominate arteries; and a tube was passed into the leftventricle through the auricular appendix. After washing out theaorta with normal saline solution to remove blood clots and air, thecat, upon its Czermak board, was placed in the inclined stand shownin Fig. I. At the readers right, in this figure, is seen the cat-boardresting upon an inclined supporting-frame. Two glass tubes are Distention of the Ventricle. 217 shown in front and to the left of the cat-board. The lower tube wasinserted in the right ventricle through the pulmonary artery, andcarried the outflow from the coronary vessels into a porcelain dish.The blood usually escaped from this tube in drops. Each drop, asit fell, struck on a thin aluminium plate of triangular shape, 17 mm.long and 14 mm. wide at the base, fastened on the lever of a Mareytambour. The plate was bent in such a way that the blood couldnot remain upon it, but ran off into the dish beneath; the impactof the falling drop caused an a

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