INFLAMMATION.
The term Inflammation signifies a state in which the infected part is hotter, redder, more congested, and more painful than is natural. Inflammation is limited to certain parts, while fever influences the system generally. Inflammation gives rise to new formations, morbid products, and lesions, or alterations of structure. The morbid products of fever, and its modification of fluids are carried away by the secretions and excretions.
The susceptibility of the body to inflammation maybe natural or acquired. It is natural when it is constitutional; that is, when there is an original tendency of the animal economy to manifest itself in some form of inflammation. We may notice that some children are far more subject to boils, croups, and erysipelatous diseases than others. This susceptibility, when innate, may be lessened by careful medication, although it may never be wholly eradicated. When acquired, it is the result of the influence of habits of life, climate, and the state of mind over the constitution
Phlegmonous inflammation is the active inflammation of the cellular membrane, one illustration of which is a common boil. The four principal symptoms are redness, swelling, heat, and pain; and then appears a conical, hard, circumscribed tumor, having its seat in the dermoid texture. At the end of an indefinite period, it becomes pointed, white or yellow, and discharges pus mixed with blood. When it breaks, a small, grayish, fibrous mass sometimes appears, which consists of dead, cellular tissue, and which is called the core.
There are certain morbid states of the constitution which lead to local inflammation, subsequent upon slight injury; or, in some cases, without any such provocation, as in gout, rheumatism, and scrofula. One of the first results of the inflammation, in such cases, is a weakening of the forces which distribute the blood to the surface and extremities of the body. It is generally admitted that in scrofulous persons the vascular system is weak, the vessels are small, and because nutrition is faulty, the blood is imperfectly organized. The result is failure in the system, for if nutrition fails, there may be lacking earthy matter for the bones, or the unctious secretions of the skin; the sebaceous secretion is albuminous and liable to become dry, producing inflammation of the parts which it ought to protect.
Disorder of the alimentary canal and other mucous surfaces are sometimes reflected upon the skin. We have occasionally observed cutaneous eruptions and erysipelas, when evidently they were distinct signs of internal disorder.
Inflammation may be internal as well as external, as inflammation of the brain, lungs, or stomach, and it is frequently the result of what is called a cold. No matter how the body is chilled, the blood retreats from the surface, which becomes pale and shrunken, there is also nervous uneasiness, and frequently a rigor, accompanied with chattering of the teeth. After the cold stage, reaction takes place and fever follows. The sudden change from a dry and heated room to a cool and moist atmosphere is liable to induce a cold. Riding in a carriage until the body is shivering, or sitting in a draft of air when one has been previously heated, or breathing a very cold air during the night when the body is warm, especially when not accustomed to doing so, or exposing the body to a low temperature when insufficiently clothed, are all different ways of producing inflammation.
Inflammation may result in consequence of local injury, caused by a bruise, or by a sharp, cutting instrument, as a knife or an axe, or it may be caused by the puncture of a pin, pen-knife blade or a fork-tine, or from a lacerated wound, as from the bite of a dog, or from a very minute wound poisoned by the bite of a venomous reptile. Local inflammations may arise from scalds, burns, the application of caustics, arsenic, corrosive sublimate, cantharides, powerful acids, abrasions of the surface by injuries, and from the occurrence of accidents.
The swelling of the part may be caused by an increase of the quantity of blood in the vessels, the effusion of serum and coagulating lymph, and the interruption of absorption by the injury, or by the altered condition of the inflamed part.
The character of the pain depends upon the tissue involved, and upon the altered or unnatural state of the nerves. Ordinarily, tendon, ligament, cartilage, and bone are not very sensitive, but when inflamed they are exquisitely so.
The heat of the inflamed part is not so great, when measured by the thermometer, as might be supposed from the patient's sensations.
Termination of Inflammation. Inflammation ends in one of six different ways. Inflammation may terminate in resolution, i.e., spontaneous recovery; by suppuration, in the formation of matter; by effusion, as the inflammation caused by a blister-plaster terminates by effusion of water; by adhesion, the part inflamed forming an attachment to some other part; by induration, hardening of the organ; or by gangrene, that is, death of the part.
Thus, inflammation of the lungs may terminate by recovery, that is, by resolution, by suppuration and raising of "matter," by hardening and solidification of the lung, or by gangrene. Inflammation of the endocardium, the lining membrane of the heart, may cause a thickening of it, and ossification of the valves of the heart, thus impairing its function. Inflammation of the pericardium may terminate in effusion, or dropsy, and inflammation of the liver may result in hardening and adhesion to adjacent parts.