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Encyclopedia Britannica - Main :: DRO-ECG |
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DROPSY (contracted from the old word hydropisy, derived from the Gr. 154w; i Swp, water, and appearance) , the name given to a collection of simple serous fluid in all or any of the cavities of the body
tissue is termed oedema when it is localized and limited in extent; when more diffuse it is termed anasarca; the term oedema is also applied to dropsies of some of the internal organs, notably to that of the lungs. Hydrocephalus signifies an accumulation of fluid within the ventricles of the brain or in the arachnoid cavity; hydrothorax, a collection of fluid in one or both pleural cavities; hydropericardium, in the pericardium; ascites, in the peritoneum; and, when anasarca is conjoined with the accumulation of fluid in one or more of the serous cavities, the dropsy is said to be general (see also PATHOLOGY
Dropsy (excluding " epidemic dropsy," for which see below) is essentially a symptom and not a specific disease, and is merely an exaggeration of a certain state of health. Fluid, known as lymph, is continually passing through the capillary walls into the tissues, and in health this is removed as fast as it is exuded, in one or more of three ways: part of it is used in the nutrition 1 L'Harmonie universelle (Paris, 1636-1637), t. ii. bk. 5, pp. 282-287 and p. 305. 2 Plato, Crito, 54; Aristophanes, Acharnians, 865, where some musicians are in derision dubbed " bumblebee pipers." See BAG-PIPE; also Kathleen Schlesinger, " Researches into the Origin of the Organs of the Ancients," Intern. taus. Ges. vol. ii. (1901), Sammelband ii. pp. 188-2o2.of the tissues, part is returned to the general circulation by the veins, and part by the lymphatics. Any accumulation constitutes dropsy and is a sign of disease, though not a disease in itself. The serous effusions due to inflammation are not included under the term dropsy. A dropsical fluid varies considerably in composition according to its position in the body
mineral
appearance it may be colo,rless, greenish or reddish from the presence of blood pigment, or yellowish from the presence of bile pigment; transparent or opalescent or milky from the presence of fatty matter derived from the chyle. The membrane from which the dropsical fluid escapes is healthy, or at least not inflamed, and only somewhat sodden by long contact with the fluidthe morbid condition on which the transudation depends lying elsewhere.The simplest cause of dropsy is purely mechanical, blood pressure being raised beyond a certain point owing to venous obstruction. This may be due to thrombosis of a vein as in phlegmasia dolens (white leg), retardation of venous circulation as in varicose veins, or obstruction of a vein due to the pressure of an, aneurism or tumour. Cardiac and renal dropsy are more complicated in origin, but cardiac dropsy is probably due to diminished absorption, and renal dropsy, when unassociated with heart failure, to increased exudation. But the starting point of acute renal dropsy, of the dropsy sometimes occurring in diabetes, and that of chlorosis is the toxic condition of the blood. For accounts of the various local dropsies see HYDROCEPHALUS; ASCITES; LIVER , &c.; general dropsy, or dropsy which depends on causes acting on the system at large, is due chiefly to diseases of the heart, kidneys or lungs, occasionally on lardaceous disease, more rarely still on diabetes or one of the anaemias.Broadly speaking, 50% of cases of general dropsy are due to disease of the heart or aorta, and 25% to renal troubles. The natural tendency of all diseases of the heart is to transfer the blood pressure from the arteries to the veins, and, so soon as this has reached a sufficient degree, dropsy in the form of local oedema commences to appear at whatever may be the most depending part of the bodythe instep and ankle in the upright position, the lower part of the back or the lungs if the patient be in bedand this tends gradually to increase till all the cavities of the body are invaded by the serous accumulation. The diseases of the lungs which produce dropsy are those which obstruct the passage of the blood through them, such as emphysema and fibrosis, and thus act precisely like disease of the heart in transferring the blood pressure from the arteries to the veins, inducing dropsy in exactly a similar manner. The dropsy of renal disease is dependent for the most part on an excess of exudation, due largely to an increase of arterial and cardiac tension. This in its turn produces arterial thickening and cardiac hypertrophy, which, if the case be sufficiently prolonged, brings about a natural removal of the fluid. In kidney cases, in the absence of cardiac disease, the dropsy will be found to appear first abotkt the loose cellular tissue surrounding the eyes, where the vessels, turgid with watery blood, have less efficient support. The dropsy of chlorosis is very similar to renal dropsy, a toxic condition of blood being present in both; also other forms of anaemia, as also hydraemia, tend to produce or assist in the production of dropsical effusions.For the treatment of dropsy the reader is referred to the articles on the several diseases of which it is a symptom. Briefly, however, tapping of the abdomen or puncture of the legs are constantly resorted to in severe cases. Dehydration by diet is very valuable under certain circumstances when the dropsy is other than renal. And there is the routine treatment by drugs, purgative, diaphoretic and diuretic as the symptoms of the case may demand. It may be well to mention that there are certain affections which may be termed spurious dropsies, such as ovarian dropsy, which is only a cystic disease of the ovary; hydrometria, dropsy of the uterus, due to inflammatory occlusion of the os uteri; hydronephrosis; dropsy of the kidney, due to obstruction of the ureter, and subsequent distension of these organs by serous accumulations; other hollow organs may also be similarly affected. Having no known relation to the preceding is epidemic dropsy, the first recorded outbreak of which occurred in Calcutta in the year 1877. It disappeared during the hot weather of the following year, only to recur over a wider area in the cold months of 1878 to 1879, and once again in the cold of 1879 to 1880. Since then only isolated cases have been recorded in the immediate neighbourhood of Calcutta, though epidemics have broken out in other places both by land and sea. At the end of 1902 an outbreak occurred in the Barisal
gaol
famine
End of Article: DROPSY (contracted from the old word hydropisy, derived from the Gr. 154w; i Swp, water, and appearance) If you wish, you can link directly to this article.
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