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contrasting features of:

dry gangrene ;commonly limbs are affected sites(distal part due to ischemia)

arterial occlusion is the mechanism.

macroscopically the organ affected is dry, shrunken and black.

putrefaction is limited due to very little blood supply.

line of demarcation is present at the junction between healthy and gangrenous part.

bacteria fail to survive.

prognosis generally better due to little septicaemia.

causes are arteriosclerosis, thromboangitis obliterans, Raynaud's disease, trauma, ergot poisoning.

wet gangrene;naturally occurs in moist tissues and organs such as mouth, bowel, lung, cervix, vulva etc.

most commonly venous obstruction, less often arterial occlusion.

macroscopically the part is moist, soft, swollen, rotten and dark.

putrefaction is markedd due to stuffing of organ with blood.

no clear line of demarcation.

numerous bacterial present.

prognosis is generally poor due to profound toxaemia.

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14y ago

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