Deceased donors (formerly cadaveric) are people who have been declared brain-dead and whose organs are kept viable by ventilators or other mechanical mechanisms until they can be excised for transplantation. Apart from brain-stem dead donors, who have formed the majority of deceased donors for the last 20 years, there is increasing use of donation-after-circulatory-death-donors (formerly non-heart-beating donors) to increase the potential pool of donors as demand for transplants continues to grow. [ citation needed ] Prior to the recognition of brain death in the 1980s, all deceased organ donors had died of circulatory death. These organs have inferior outcomes to organs from a brain-dead donor.  For instance, patients who underwent liver transplantation using donation-after-circulatory- death (DCD) allografts have been shown to have significantly lower graft survival than those from donation-after-brain-death (DBD) allografts due to biliary complications and PNF.  However, given the scarcity of suitable organs and the number of people who die waiting, any potentially suitable organ must be considered.
People who wish to donate their entire body to medical science should contact the medical school or willed body program of their choice and make arrangements to do so before they die. Medical schools need bodies to teach medical students about anatomy, and research facilities need them to study disease processes so they can devise cures. Since the bodies used for these purposes generally must be complete with all their organs and tissues, organ donation is not an option. Some programs, however, make exceptions. You can inform your family that organ donation is your first choice, but if it is found that you are not medically suitable for organ donation, your family can carry out your wishes for whole body donation.