An account of some experiments illustrative of the mode of formation of the dissecting aneurisms / by Thomas B. Peacock.

  • Peacock, Thomas B. (Thomas Bevill), 1812-1882.
Date:
[1843]
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Licence: Public Domain Mark

Credit: An account of some experiments illustrative of the mode of formation of the dissecting aneurisms / by Thomas B. Peacock. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    Article II.—Afi Account of some Experiments illustrative of the mode of formation of the Dissecting Aneurisms. By Thomas B. Peacock, M.D., late Pathologist to the Edin- burgh Royal Infirmary. (With a Plate.) [extracted from the LONDON AND EDINBURGH MONTHLY JOURNAL OF MEDICAL SCIENCE, FOR OCTOBER, MDCCCXLIII.] It has been usually conceived, that the Dissecting Aneurisms derive their origin from the occurrence of a rupture of the inter- nal coats of an artery, by which the blood is enabled to insinuate itself between the external and middle coats and effect their separation, so as to produce a sac following the course of the vessel ; and the development of this form of disease, rather than the circumscribed aneurismal tumours, has been explained by supposing that, in the latter cases, the slow change, on which the internal rupture depends, has previously rendered the tunics intimately adherent, so as to preclude their separation by the current of blood. To this view it has, however, been objected,—;^r5^. That the existence of adhesions between the coats, in cases of circum- scribed aneurismal tumours, so far from being constant, is of rare occurrence ; secondly, That the supposition of such adhe- sion is unnecessary, and is discountenanced by the intimate and firm union which generally exists between the coats of an artery, and by the effect of forcibly injecting fluids either directly between the coats, or into an artery until its internal coats are ruptured, when, in either case, a tumour results from the eleva- tion and distension of the outer coat, and not an extensive sepa- ration of the coats as in a dissecting aneurism.^ The latter ob- jection, which has recently been urged by Professor Henderson, is, I conceive, founded on the experiments of Drs. Nicholls and Scarpa. The former is said to have demonstrated before the Royal Society, in the year 1728, that when air is blown into the pulmonary artery until the internal coat be ruptured, the external will form itself into aneurismal tumours. Scarpa ' Monthly Journal, for July 1843. 2 Phil. Trans. \72S.