gangrene

gangrene, local death of body tissue. Dry gangrene, the most common form, follows a disturbance of the blood supply to the tissues, e.g., in diabetes, arteriosclerosis, thrombosis, or destruction of tissue by injury. A second type, moist gangrene, results from an invasion of toxin-producing bacteria that destroy tissue. Gangrene usually affects an arm or leg, but it may occur anywhere, e.g., pulmonary gangrene may follow an abscess of the lung. Treatment of gangrene includes rest and the administration of antibiotics if the gangrene is moist and bacterial invasion is present. Excision of the diseased portions of the body may be necessary and, in advanced involvement, amputation of the part. In gas gangrene, which results from the invasion of wounds by anaerobic bacteria, gas forms under the skin and a watery exudate is produced. Emergency treatment with penicillin and antitoxin is needed; without treatment, gas gangrene is invariably fatal.

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gangrene

Localized soft-tissue death (necrosis) from prolonged blood-supply blockage. It can occur in atherosclerosis, diabetes mellitus, or decubitus ulcer, and after severe burns or frostbite. In dry gangrene, gradual blood-supply decrease turns the part discoloured and cold, then dark and dry. Treatment requires improving blood flow. Moist gangrene comes from a sudden blood-supply cutoff. Bacterial infection causes swelling, discoloration, and then a foul smell. Along with antibiotics, tissue removal may be needed to prevent spread, which can be fatal. A more virulent form, gas gangrene, is named for gas bubbles under the skin produced by a highly lethal toxin from clostridium bacteria. The wound oozes brownish, smelly pus. Infection spreads rapidly, causing death. All dead and diseased tissue must be removed and antibiotics given; an antitoxin can also be used.