Edinburgh Medical Journal, 1881, Vol. 1 PDF ePub eBook

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Edinburgh Medical Journal, 1881, Vol. 1 free pdf Excerpt from Edinburgh Medical Journal, 1881, Vol. 1 But Gaskell has shown that even tetanic muscular contraction favours the arterial blood-flow through it, instead of obstructing it. Hyrtl has shown, from a special examination of 117 bodies, that in the greater number the orifices of both coronaries are above the free margin of the semilunar valve, and that one at least always is so. He also states, as the result of numerous experiments on rabbits, cats, and dogs, that section of the coronary arteries is invariably followed by an intermittent blood-spurt co-incident with the systole of the ventricle, and this he thinks conclusively proves that closure of the coronaries by the segments of the aortic valve cannot exist. By a reference to the physics of the valve segments themselves, and also of the blood-current, Ceradini has shown that the valve segments are not closely applied to the arterial wall during the ventricular systole, but float in an intermediate position, maintained in equilibrium by the central or axial stream on the one hand, and on the other by reflux currents which, originating at the exterior of the axial stream, flow outwards and downwards against the arterial wall, and are reflected from it upon the posterior surface of the segments of the aortic valve. These statements seem conclusively to prove that the coronary arteries are patent to the blood-flow during the ventricular systole- and when we reflect that the coronaries are flushed not merely by a reflux current of unknown value, but, through the influence of Pascal's law, by a blood-current having the minimum aortic pressure of 200 m.m. Hg., we see that the cardiac muscle is freely supplied with highly oxygenated and nutritive blood at the very moment when it requires it most, when the transformation of energy, from potential to kinetic, within its substance is at its height. And this is in complete consonance with the fact that, except in very advanced cases of long standing, or where other causes have also been at work, the heart in aortic incompetence is always found to be well-nourished and free from signs of degeneration. It also explains the remarkable fact that sufferers from aortic disease are not necessarily shortlived- from causes which shall be presently explained, they are certainly liable to sudden death in a higher ratio than other men, but they often lead useful and wonderfully long lives, quite unconscious of the existence of any serious disease. To others the signs, or some of them at least, may be apparent enough- they themselves are quite unconscious of anything but the fullest vital vigour. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully- any imperfections that remain are intentionally left to preserve the state of such historical works.

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Details Book

Author : Unknown Author
Publisher : Forgotten Books
Data Published : 27 September 2015
ISBN : 1330186702
EAN : 9781330186701
Format Book : PDF, Epub, DOCx, TXT
Number of Pages : 620 pages
Age + : 15 years
Language : English
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  • Edinburgh Medical Journal, 1881, Vol. 1 free pdfEdinburgh Medical Journal, 1881, Vol. 1

    Free Ebook Downloads ePub. Excerpt from Edinburgh Medical Journal, 1881, Vol. 1 But Gaskell has shown that even tetanic muscular contraction favours the arterial blood-flow through it, instead of obst