liver, lung lobe, small bowel). regenerative medicine may one day allow for laboratory-grown organs, using person's own cells via stem cells, or healthy cells extracted from the failing organs. deceased donor 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 brainstem-dead donors, who have formed the majority of deceased donors for the last 20 years, there is increasing use of after-circulatory-death donors (formerly non-heart-beating donors) to increase the potential pool of donors as demand for transplants continues to grow. prior to the legal 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 allografts have been shown to have significantly lower graft survival than those from donation-after-brain-death allografts due to biliary complications and primary nonfunction in liver transplantation. however, given the scarcity of suitable organs and the number of people who die waiting, any potentially suitable organ must be considered. jurisdictions with medically assisted suicide may co-ordinate organ donations from that source. allocation of organs