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gangrene
Gangrene (or gangrenous necrosis) is a type of necrosis caused by a critically insufficient blood supply. This potentially life-threatening condition may occur after an injury or infection, or in people suffering from any chronic health problem affecting blood circulation.〔 The primary cause of gangrene is reduced blood supply to the affected tissues, which results in cell death.〔 Diabetes and long-term smoking increase the risk of suffering from gangrene.〔
Gangrene is a non-communicable disease. It does not spread from person to person. There are different types of gangrene with different symptoms, such as dry gangrene, wet gangrene, gas gangrene, internal gangrene and necrotizing fasciitis.〔〔 Treatment depends on the underlying cause, and can include resection, debridement (or, in severe cases, amputation) of the affected body parts, antibiotics, revascularization (via a vascular bypass or angioplasty), or hyperbaric oxygen therapy. It can rarely include medical therapy to stop vascular spasm or the production of cold-induced vascular obstruction by cold-precipitated cryoglobulins.
== Etymology ==
The etymology of gangrene derives from the Latin word ''gangraena'' and from the Greek ''gangraina'' (γάγγραινα), which means "putrefaction of tissues". It has no etymological connection with the word green, despite the affected areas turning black and/or green and/or yellowish brown. It is coincidence that, in Lowland Scots the words "gang green" (go green) can be said to be an eggcorn for gangrene, as it describes the symptoms of the affliction.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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