Ischemia-free Transplantation

The central benefit is continuity: the graft continues receiving oxygen and nutrients instead of undergoing a prolonged oxygen shortage before implantation. Maintaining metabolism and cellular function can limit the physiological stress associated with ischemia followed by restored circulation, known as ischemia-reperfusion injury. This mechanism is why the approach may support better graft viability and early organ function.

Normothermic machine perfusion provides the operating conditions that make continuous preservation possible. The donor organ connects to a perfusion circuit carrying oxygenated blood and nutrients at a near-physiological temperature. Keeping these inputs closer to normal biological conditions supports ongoing metabolic activity and cellular function, rather than treating the organ as metabolically inactive during storage.

Compared with conventional cold storage, the ischemia-free approach targets the interruption in blood flow that cold preservation permits. Cold storage does not provide continuous active perfusion, whereas normothermic perfusion maintains oxygen delivery throughout the preservation interval. The distinction matters because preservation aims not only to delay damage but also to sustain the graft’s functional state until implantation.

At a procedural level, preservation begins by connecting the donor organ to a normothermic machine-perfusion circuit after procurement. The circuit supplies oxygenated blood and nutrients while the organ remains at near-physiological temperature, and perfusion continues through the interval ending with recipient implantation. This continuity links donor procurement and implantation within one preservation process.

A practical advantage is the opportunity for real-time assessment during preservation. Because the organ remains connected to an active perfusion system, researchers and transplant teams can assess the graft while it is being maintained rather than relying only on its initial donor characteristics. This capability is especially relevant when considering marginal donor organs, whose viability may be uncertain.

In transplant medicine, the approach is most relevant when teams need to preserve graft function while broadening the donor pool. Its proposed value lies in combining continuous physiological support with assessment during preservation, potentially making marginal organs more usable. The key outcomes of interest are graft viability and early post-transplant organ function, rather than preservation time alone.