Successful storage of kidneys

Twelve-hour liver preservation in the pig using hypothermia and hyperbaric oxygen

In an attempt to prolong successful storage of the pig liver beyond the 6–8 hours previously described from this laboratory, the addition of cell-membranestabilizing drugs to the preserving solution and the use of a potassium-rich solution were investigated. Using simple hypothermia alone, 10- and 12-hour storage was unsuccessful. Using the previously described hypothermic technique, but with the addition of hyperbaric oxygen at 3 atmospheres absolute (A.T.A.), consistently successful 12-hour preservation was achieved.

History of clinical transplantation

The emergence of transplantation has seen the development of increasingly potent immunosuppressive agents, progressively better methods of tissue and organ preservation, refinements in histocompatibility matching, and numerous innovations in surgical techniques. Such efforts in combination ultimately made it possible to successfully engraft all of the organs and bone marrow cells in humans. At a more fundamental level, however, the transplantation enterprise hinged on two seminal turning points. The first was the recognition by Billingham, Brent, and Medawar in 1953 that it was possible to induce chimerism-associated neonatal tolerance deliberately. This discovery escalated over the next 15 years to the first successful bone marrow transplantations in humans in 1968. The second turning point was the demonstration during the early 1960s that canine and human organ allografts could self-induce tolerance with the aid of immunosuppression. By the end of 1962, however, it had been incorrectly concluded that turning points one and two involved different immune mechanisms. The error was not corrected until well into the 1990s. In this historical account, the vast literature that sprang up during the intervening 30 years has been summarized. Although admirably documenting empiric progress in clinical transplantation, its failure to explain organ allograft acceptance predestined organ recipients to lifetime immunosuppression and precluded fundamental changes in the treatment policies. After it was discovered in 1992 that long-surviving organ transplant recipients had persistent microchimerism, it was possible to see the mechanistic commonality of organ and bone marrow transplantation. A clarifying central principle of immunology could then be synthesized with which to guide efforts to induce tolerance systematically to human tissues and perhaps ultimately to xenografts.

Adult Cardiac Transplantation

Patients with severe drug-refractory heart failure experience one of two modes of death. Either they collapse from an arrhythmia and are deemed to have had sudden death, or they die of progressive congestive heart failure. In either instance, their poor functional status during life limits their ability to perform usual daily activities. Currently, the only proven long-term benefit to these patients is heart transplantation. The technique that led to the first human-to-human heart transplantation nearly 30 years ago has changed very little; however, refinements in post operative care have kept research in this field at the fore for many years. Immediate postoperative hemodynamic stabilization by experienced clinicians may improve a patient's chances of survival after heart transplantation. Improved immunosuppressive agents have decreased life-threatening rejection episodes. Better knowledge of the infectious diseases that attack these immunosuppressed patients has also contributed to the nearly 85% one-year survival of heart transplantation recipients. The longest surviving heart transplantation recipient remains alive and well after more than 22 years. The development of transplant-related coronary artery disease may be the only transplantation-associated factor that keeps recipients from living for many decades. Transplantation coronary artery disease leads the list of late causes of mortality. Unlike native coronary artery disease, there exists ongoing difficulty in both diagnosis and treatment of this dreaded complication. We cover current standards and future possibilities in adult heart transplantation. We look at history, demographics, indications, management, and outcome in these patients, as well as future goals.

Etiology of rising perfusion pressure in isolated organ perfusion

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