Excerpt from Principles and Practice of Surgery
Redness. - This symptom is owing to distension of the vessels which convey blood; to blood being admitted into those which usually appear to receive only the colorless part of it, whether this be owing to the red globules not entering at all, or only so few at a time as to conceal their color, since it is only when existing in considerable assemblages that they appear red; and also to bloody effusion into the interstices of the structure concerned. Inflammation of the conjunctiva affords one of the best examples of these changes.
The redness varies considerably in shade. It is generally bright and florid, like that of arterial blood, but it often has a yellow hue, and still more frequently is dark, or almost purple. The yellow tinge is most frequently observed along with derangement of the biliary secre tion, as in erysipelas; but the dark color depends on different circum stances, the discrimination of which is of great importance in practice. It was formerly thought a certain indication of putrid tendency, or proneness to die from weakness, and an unquestionable indication for administering wine, bark and cordials. It is now observed to depend frequently on obstruction of the respiratory function, preventing the blood from undergoing its proper change. It is seen also when the venous circulation of an inflamed part is impeded.
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