Gangrene

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Pathophysiology

Wet gangrene

Wet gangrene is perhaps the more familiar of the two types, at least in media portrayals. An injury, such as a gunshot or laceration, leads to a bacterial infection, which produces pus. If the pus does not drain well, the blood supply to the area is blocked, and with it, the oxygen. With its oxygen supply cut off, the tissue dies.

Related Topics:
Gunshot - Bacteria - Pus - Oxygen

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Treatment of the underlying infection is necessary, as is removal of the dead tissue. Without treatment, the infection can spread further and destroy increasing amounts of tissue. Eventually, sepsis and death can result.

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Dry gangrene

If the blood flow is interrupted for a reason other than severe bacterial infection, the result is a dry gangrene. Persons with impaired peripheral blood flow, such as diabetics, are at greater risk for dry gangrene.

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The early signs of dry gangrene are a dull ache and sensation of coldness in the area, along with pallor of the flesh. If caught early, the process can sometimes be reversed by vascular surgery. However, if necrosis sets in, the affected tissue must be removed just as with wet gangrene.

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