Which of these is a type of tissue death caused by a lack of blood supply?

JezzerLX, Maggots are used differently than leeches. Leeches are used in blood letting; maggots are used to chew away dead flesh, leaving just healthy flesh. Maggots aided in wound healing. Both treatments were used extensively during the Civil War.

Debridement is removal of skin tissue, basically.

I also have Raynauds. lost tip of left index finger, then yrs later lost right tip of index finger. still surviving

Gary, not so. I have Reynauds and it comes and goes...for the last 30 years

Player #4250921, leeches are sometimes used to 'prevent' gangrene in skin grafts. New grafts may not have the blood vessels to drain blood leading to fresh blood being unable to get to cells. Leeches will ingest the trapped blood resolving the problem. I had leech treatment for a nose graft after cancer treatment... a hideous experience.

Gary, I had part of my colon removed because of gangrene. terrible recovery.

World's most renowned King Louis The XIV was the possessor of the world's most cursed diamond, The Hope Diamond and he died of the curse of the diamond by gangrene at the age of 76

ElixSkipper, Removal of dead tissue.

Usually results in amputation or death.