A Treatise on the Diseases of the Heart and Great Vessels (Classic Reprint)
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| Hersteller: | Forgotten Books (Hope, James) |
| Stand: | 2015-08-04 03:50:33 |
Produktbeschreibung
Excerpt from A Treatise on the Diseases of the Heart and Great Vessels It has, I believe, been almost universally admitted, both in this country and abroad, that the experiments detailed at pages 21 and 30 fix the first sound of the heart on the contraction of the ventricles, and the second, on their dilatation. The experiments did not demonstrate the immediate causes of the sounds, and my inferential explanations of them (at page 48) were soon doubted. Some thought that the closure of the valves was the cause; and I readily cede the merit of originality in this supposition to M. Rouanet, Mr. Bryan, M. Bouillaud, Mr. Carlile, &c.: others, as Dr. Williams, ascribed the first sound to the muscular sound, on which I have (at page 47) given an opinion essentially substantiated by the subjoined experiments. If my explanations were erroneous, it was my duty to correct them; I therefore commenced in 1832 a new series of hospital researches on the living and dead subject, and soon satisfied myself that the first sound was loudest over the middle of the ventricles, and the second, over the sigmoid valves, and thence for a few inches upwards; also, that when a healthy subject was faint, the first sound lost its prolongation, and became short and smart like the second; whence I inferred that, in its natural state, it might have a compound cause, viz. the closure of the valves, and the motion of the blood, or the bruit musculaire. The presumptions thus offered, that the valves were concerned in the production of the sounds, required corroboration by experimental and pathological evidence. Not having succeeded in satisfactorily imitating the second sound by injecting fluids retrograde into the aorta, I tried the expansion of membranes under water, and found that three inches of fine tape, two lines broad, held to the end of a stethoscope, and gently jerked under water, imitated the second sound, both the sounds in dilatation, and the double sound of the foetal heart, to perfection. Hence it was more than probable that the sudden expansion of membranes so small as the sigmoid valves was sufficient to produce such a sound as the second. It was not easy to meet with satisfactory pathological cases on this subject; as, to be conclusive, great disease of the valves on both sides of the heart simultaneously, seemed to be required. 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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