Surgeons at St Vincent's Hospital in Sydney, Australia have performed the world's first transplant of a dead heart by using a new technique to revive the organ. The surgery is a major medical breakthrough that could help reduce the shortage of donor organs. The hospital has transplanted two hearts that were donated after circulatory death and were no longer beating, and both recipients are recovering well. This new technique uses a preservation solution and "heart in a box" machine to resuscitate, preserve, and assess the heart before transplant. It allows for hearts previously considered unsuitable for transplant to now be used, increasing the availability of donor hearts.