Why must blood vessels be rapidly connected during organ or limb transplantation?

In organ and limb transplantation, blood vessels must be rapidly connected—a process known as anastomosis—to ensure the graft receives a blood supply as quickly as possible.1

This urgency is necessary to prevent the organ or limb from dying due to a lack of oxygen and essential nutrients. Furthermore, rapid reconnection prevents the accumulation of poisonous waste products within the tissue. Without a blood supply, organs begin to deteriorate rapidly, and different organs have varying levels of susceptibility to this damage; for instance, while the brain suffers irreversible destruction within minutes at body temperature, other organs like the heart, liver, pancreas, and lung also face critical time constraints. Consequently, minimizing the time an organ is deprived of its blood supply is vital for the success of the transplant.12