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Encyclopedia Britannica - Main :: WIL-YAK |
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WOUND (O. Eng. wund,connected with a Teutonic verb, meaning to strive, fight, suffer, seen in O. Eng. winnan, whence Eng. " win ") , a solution in the continuity of the soft parts of the body
in the tenser tissues. The discoloration is caused by haemorrhage into the tissues (ecchymosis), and passes from dark purple through green to yellow before it disappears. If a considerable amount of blood is poured forth into the injured tissues it is termed a haematoma. The treatment of a bruise consists in the application of cold lotion, preferably an evaporating spirit-lotion, to limit the subcutaneous bleeding. The haemorrhage usually becomes absorbed of its own accord even in haematomata, but should suppuration threaten an incision must be made and the cavity aseptically evacuated.Open wounds are divided into incised, lacerated, punctured and gunshot wounds. Incised wounds are made by any sharp
instrument and have their edges evenly cut. In these wounds there is usually free haemorrhage, as the vessels are cleanly divided. Lacerated wounds are those in which the edges of the wound are torn irregularly. Such injuries occur frequently from accidents with machinery or blunt instruments, or from bites by animals. The haemorrhage is less than from incised wounds, and the edges may be bruised. Punctured wounds are those in which the depth is greater than the external opening. They are generally produced by sharp
chief
thorax and abdomen. It is also difficult to keep such wounds surgically clean and to obtain apposition of their deeper parts, and septic germs are often carried in with the instrument .The treatment of incised wounds is to arrest the bleeding (see HAEMORRHAGE), cleanse the wound and its surroundings, removing all foreign bodies (splinters, glass, &c.), and obtain apposition of the cut surfaces. This is usually done by means of sutures or stitches of silk, catgut, silkwormgut or silver wire. If the wound can be rendered aseptic, incised wounds usually heal by first intention. In lacerated wounds there is danger of suppuration, sloughing, erysipelas or tetanus. These wounds do not heal by first intention, and there is consequently considerable scarring. The exact amount of time occupied in the repair depends upon the presence or not of septic material, as lacerated wounds are very difficult to cleanse properly. Carbolic acid lotion should be used for cleansing, while torn or ragged portions should be cut away and provision made for free drainage. It is not always possible to apply sutures at first, but the wound may be packed with iodoform gauze, and later, when a clean granulating surface has been obtained, skin-grafting may be required. In extensive lacerated wounds, where the flesh has been stripped from the bones, where there is spreading gangrene, or in such wounds in conjunction with comminuted fractures or with severe sepsis supervening, amputation of a limb may be called for. Punctured wounds should be syringed with carbolic lotion, and all splinters and foreign bodies removed. The location of needles is rendered comparatively easy by the use of the Rontgen rays; the wound can then be packed with gauze and drained. If a large vessel should have been injured, the wound may have to be laid open and the bleeding vessel secured. Should paralysis indicate that a large nerve has been divided, the wound must also be laid open in order to suture the injured structure. It is only possible here to mention some of the special
drill
Martini -Henry bullets make larger apertures, while soft-nosed or " dum-dum " bullets spread out as soon as the bullet strikes, causing great mutilation and destruction of the tissues. Shell wounds cause extensive lacerations. Small shot may inflict serious injury should one of the pellets enter the eye. In gunshot wounds at short distance the skin may be blackened owing to the particles of carbon lodging in it. The chief
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