For dry gangrene, vascular surgeons typically do angiography (a radiologic examine with dye that shows arterial blood stream in tissues, also termed arteriogram) to begin to see the extent of ongoing or probable arterial blood decline to tissue. Damp gangrene: This type requires an an infection. It’s termed "damp" as https://www.sgvascularctr.com/what-is-a-gangrene/