intestinal transplant

• 腸管移植

WordNet

1. be transplantable; "These delicate plants do not transplant easily"
2. an operation moving an organ from one organism (the donor) to another (the recipient); "he had a kidney transplant"; "the long-term results of cardiac transplantation are now excellent"; "a child had a multiple organ transplant two months ago" (同)transplantation, organ_transplant
3. the act of removing something from one location and introducing it in another location; "the transplant did not flower until the second year"; "too frequent transplanting is not good for families"; "she returned to Alabama because she could not bear transplantation" (同)transplantation, transplanting
4. place the organ of a donor into the body of a recipient (同)graft
5. lift and reset in another soil or situation; "Transplant the young rice plants" (同)transfer
6. of or relating to or inside the intestines; "intestinal disease" (同)enteric, enteral

PrepTutorEJDIC

1. 〈植物〉‘を'移植する / (…から他の場所へ)…‘を'移す,〈人〉‘を'移住させる《+名+from+名+to+名》 / (…から…へ)〈組織・器官など〉‘を'移植する《+名+from+名+to+名》 / 移植できる;移住する / 〈C〉移植された物 / 〈U〉移植すること
2. 腸[内]の

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/08/12 13:06:50」(JST)

wiki en

[Wiki en表示]

Organ transplantation
Intervention
Saints Cosmas and Damian miraculously transplant the (black) leg of a Moor onto the (white) body of Justinian. Ditzingen, 16th century
ICD-10-PCS	0?Y
MeSH	D016377

Organ transplantation is the moving of an organ from one body to another or from a donor site to another location on the patient's own body, for the purpose of replacing the recipient's damaged or absent organ. The emerging field of regenerative medicine is allowing scientists and engineers to create organs to be re-grown from the patient's own cells (stem cells, or cells extracted from the failing organs). Organs and/or tissues that are transplanted within the same person's body are called autografts. Transplants that are recently performed between two subjects of the same species are called allografts. Allografts can either be from a living or cadaveric source.

Organs that can be transplanted are the heart, kidneys, liver, lungs, pancreas, intestine, and thymus. Tissues include bones, tendons (both referred to as musculoskeletal grafts), cornea, skin, heart valves, nerves and veins. Worldwide, the kidneys are the most commonly transplanted organs, followed by the liver and then the heart. The cornea and musculoskeletal grafts are the most commonly transplanted tissues; these outnumber organ transplants by more than tenfold.

Organ donors may be living, brain dead, or dead via circulatory death. Tissue may be recovered from donors who die of circulatory death, as well as of brain death – up to 24 hours past the cessation of heartbeat. Unlike organs, most tissues (with the exception of corneas) can be preserved and stored for up to five years, meaning they can be "banked". Transplantation raises a number of bioethical issues, including the definition of death, when and how consent should be given for an organ to be transplanted and payment for organs for transplantation. Other ethical issues include transplantation tourism and more broadly the socio-economic context in which organ procurement or transplantation may occur. A particular problem is organ trafficking. Some organs, such as the brain, cannot be transplanted.

Transplantation medicine is one of the most challenging and complex areas of modern medicine. Some of the key areas for medical management are the problems of transplant rejection, during which the body has an immune response to the transplanted organ, possibly leading to transplant failure and the need to immediately remove the organ from the recipient. When possible, transplant rejection can be reduced through serotyping to determine the most appropriate donor-recipient match and through the use of immunosuppressant drugs.

History

Successful human allotransplants have a relatively long history of operative skills that were present long before the necessities for post-operative survival were discovered. Rejection and the side effects of preventing rejection (especially infection and nephropathy) were, are, and may always be the key problem.

Several apocryphal accounts of transplants exist well prior to the scientific understanding and advancements that would be necessary for them to have actually occurred. The Chinese physician Pien Chi'ao reportedly exchanged hearts between a man of strong spirit but weak will with one of a man of weak spirit but strong will in an attempt to achieve balance in each man. Roman Catholic accounts report the 3rd-century saints Damian and Cosmas as replacing the gangrenous leg of the Roman deacon Justinian with the leg of a recently deceased Ethiopian. Most accounts have the saints performing the transplant in the 4th century, many decades after their deaths; some accounts have them only instructing living surgeons who performed the procedure.

The more likely accounts of early transplants deal with skin transplantation. The first reasonable account is of the Indian surgeon Sushruta in the 2nd century BC, who used autografted skin transplantation in nose reconstruction, a rhinoplasty. Success or failure of these procedures is not well documented. Centuries later, the Italian surgeon Gasparo Tagliacozzi performed successful skin autografts; he also failed consistently with allografts, offering the first suggestion of rejection centuries before that mechanism could possibly be understood. He attributed it to the "force and power of individuality" in his 1596 work De Curtorum Chirurgia per Insitionem.

Alexis Carrel: 1912's Nobel Prize for his work on organ transplantation.

The first successful corneal allograft transplant was performed in 1837 in a gazelle model; the first successful human corneal transplant, a keratoplastic operation, was performed by Eduard Zirm at Olomouc Eye Clinic, now Czech Republic, in 1905. The first transplant in the modern sense - the implantation of organ tissue in order to replace an organ function - was a thyroid transplant in 1883. It was performed by the Swiss surgeon and later Nobel laureate Theodor Kocher. In the preceding decades Kocher had perfected the removal of excess thyroid tissue in cases of goiter to an extent that he was able to remove the whole organ without the patient dying from the operation. Kocher carried out the total removal of the organ in some cases as a measure to prevent recurrent goiter. By 1883 the surgeon noticed that the complete removal of the organ leads to a complex of particular symptoms that we today have learned to associate with a lack of thyroid hormone. Kocher reversed these symptoms by implanting thyroid tissue to these patients and thus performed the first organ transplant. In the following years Kocher and other surgeons used thyroid transplantation also to treat thyroid deficiency that had appeared spontaneously, without a preceding organ removal. Thyroid transplantation became the model for a whole new therapeutic strategy, organ transplantation. After the example of the thyroid, other organs were transplanted in the decades around 1900. Some of these transplants were done in animals for purposes of research, where organ removal and transplantation became a successful strategy of investigating the function of organs. Kocher was awarded his Nobel Prize in 1909 for the discovery of the function of the thyroid gland. At the same time, organs were also transplanted for treating diseases in humans. The thyroid gland became the model for transplants of adrenal and para-thyroid glands, pancreas, ovary, testicles and kidney. By 1900 the idea that one can successfully treat internal diseases by replacing a failed organ through transplantation had been generally accepted. Pioneering work in the surgical technique of transplantation was made in the early 1900s by the French surgeon Alexis Carrel, with Charles Guthrie, with the transplantation of arteries or veins. Their skilful anastomosis operations, the new suturing techniques, laid the groundwork for later transplant surgery and won Carrel the 1912 Nobel Prize in Physiology or Medicine. From 1902 Carrel performed transplant experiments on dogs. Surgically successful in moving kidneys, hearts and spleens, he was one of the first to identify the problem of rejection, which remained insurmountable for decades. The discovery of transplant immunity by the German surgeon Georg Schöne, various strategies of matching donor and recipient, and the use of different agents for immune suppression did not result in substantial improvement so that organ transplantation was largely abandoned after WWI .

Major steps in skin transplantation occurred during the First World War, notably in the work of Harold Gillies at Aldershot. Among his advances was the tubed pedicle graft, maintaining a flesh connection from the donor site until the graft established its own blood flow. Gillies' assistant, Archibald McIndoe, carried on the work into the Second World War as reconstructive surgery. In 1962 the first successful replantation surgery was performed – re-attaching a severed limb and restoring (limited) function and feeling.

Transplant of a single gonad (testis) from a living donor was carried out in early July 1926 in Zaječar, Serbia, by a Russian emigré surgeon Dr. Peter Vasil'evič Kolesnikov. The donor was a convicted murderer, one Ilija Krajan, whose death sentence was commuted to 20 years imprisonment and he was led to believe that it was done because he had donated his testis to an elderly medical doctor. Both the donor and the receiver survived, but charges were brought in a court of law by the public prosecutor against Dr. Kolesnikov, not for performing the operation, but for lying to the donor.

The first attempted human deceased-donor transplant was performed by the Ukrainian surgeon Yuri Voronoy in the 1930s; rejection resulted in failure. Joseph Murray and J. Hartwell Harrison performed the first successful transplant, a kidney transplant between identical twins, in 1954, because no immunosuppression was necessary for genetically identical individuals.

In the late 1940s Peter Medawar, working for the National Institute for Medical Research, improved the understanding of rejection. Identifying the immune reactions in 1951, Medawar suggested that immunosuppressive drugs could be used. Cortisone had been recently discovered and the more effective azathioprine was identified in 1959, but it was not until the discovery of cyclosporine in 1970 that transplant surgery found a sufficiently powerful immunosuppressive.

Dr. Murray's success with the kidney led to attempts with other organs. There was a successful deceased-donor lung transplant into a lung cancer sufferer in June 1963 by James Hardy in Jackson, Mississippi. The patient survived for eighteen days before dying of kidney failure. Thomas Starzl of Denver attempted a liver transplant in the same year but was not successful until 1967.

The heart was a major prize for transplant surgeons. But over and above rejection issues, the heart deteriorates within minutes of death, so any operation would have to be performed at great speed. The development of the heart-lung machine was also needed. Lung pioneer James Hardy attempted a human heart transplant in 1964, but when a premature failure of the recipient's heart caught Hardy with no human donor, he used a chimpanzee heart, which failed very quickly. The first success was achieved on December 3, 1967, by Christiaan Barnard in Cape Town, South Africa. Louis Washkansky, the recipient, survived for eighteen days amid what many saw as a distasteful publicity circus. The media interest prompted a spate of heart transplants. Over a hundred were performed in 1968–69, but almost all the patients died within sixty days. Barnard's second patient, Philip Blaiberg, lived for 19 months.

It was the advent of cyclosporine that altered transplants from research surgery to life-saving treatment. In 1968 surgical pioneer Denton Cooley performed seventeen transplants, including the first heart-lung transplant. Fourteen of his patients were dead within six months. By 1984 two-thirds of all heart transplant patients survived for five years or more. With organ transplants becoming commonplace, limited only by donors, surgeons moved on to riskier fields, including multiple-organ transplants on humans and whole-body transplant research on animals. On March 9, 1981, the first successful heart-lung transplant took place at Stanford University Hospital. The head surgeon, Bruce Reitz, credited the patient's recovery to cyclosporine-A.

As the rising success rate of transplants and modern immunosuppression make transplants more common, the need for more organs has become critical. Transplants from living donors, especially relatives, have become increasingly common. Additionally, there is substantive research into xenotransplantation, or transgenic organs; although these forms of transplant are not yet being used in humans, clinical trials involving the use of specific cell types have been conducted with promising results, such as using porcine islets of Langerhans to treat type 1 diabetes. However, there are still many problems that would need to be solved before they would be feasible options in patients requiring transplants.

Recently, researchers have been looking into means of reducing the general burden of immunosuppression. Common approaches include avoidance of steroids, reduced exposure to calcineurin inhibitors, and other means of weaning drugs based on patient outcome and function. While short-term outcomes appear promising, long-term outcomes are still unknown, and in general, reduced immunosuppression increases the risk of rejection and decreases the risk of infection.

Many other new drugs are under development for transplantation.

The emerging field of regenerative medicine promises to solve the problem of organ transplant rejection by regrowing organs in the lab, using the patients' own cells (stem cells or healthy cells extracted from the donor site.)

Timeline of successful transplants

• 1823: First skin autograph transplantation of skin tissue from one location on an individual’s body to another location (Germany)
• 1905: First successful cornea transplant by Eduard Zirm (Czech Republic)
• 1908:First skin allograft-transplantation of skin from a donor to a recipient (Switzerland)
• 1950: First successful kidney transplant by Dr Richard H. Lawler (Chicago, U.S.A)
• 1954:First living related kidney transplant (identical twins) (U.S.A)
• 1955: First heart valve allograft into descending aorta (Canada)
• 1962: First kidney transplant from a deceased donor (U.S.A)
• 1965: Australia’s first successful (living) kidney transplant (Queen Elizabeth Hospital, SA, Australia)
• 1966: First successful pancreas transplant by Richard Lillehei and William Kelly (Minnesota, U.S.A.)
• 1967: First successful liver transplant by Thomas Starzl (Denver, U.S.A.)
• 1967: First successful heart transplant by Christian Barnard (Cape Town, South Africa)
• 1981: First successful heart/lung transplant by Bruce Reitz (Stanford, U.S.A.)
• 1983: First successful lung lobe transplant by Joel Cooper (Toronto, Canada)
• 1984: First successful double organ transplant by Thomas Starzl and Henry T. Bahnson (Pittsburgh, U.S.A.)
• 1986: First successful double-lung transplant (Ann Harrison) by Joel Cooper (Toronto, Canada)
• 1995: First successful laparoscopic live-donor nephrectomy by Lloyd Ratner and Louis Kavoussi (Baltimore, U.S.A.)
• 1997: First successful allogeneic vascularized transplantation of a fresh and perfused human knee joint by Gunther O. Hofmann
• 1998: First successful live-donor partial pancreas transplant by David Sutherland (Minnesota, U.S.A.)
• 1998: First successful hand transplant by Dr. Jean-Michel Dubernard (Lyon, France)
• 1999: First successful Tissue Engineered Bladder transplanted by Anthony Atala (Boston Children's Hospital, U.S.A.)
• 2005: First successful ovarian transplant by Dr P N Mhatre (Wadia hospital Mumbai, India)
• 2005: First successful partial face transplant (France)
• 2006: First jaw transplant to combine donor jaw with bone marrow from the patient, by Eric M. Genden Mount Sinai Hospital, New York
• 2006: First successful human penis transplant (later reversed after 15 days due to 44-year-old recipient's wife's psychological rejection) (Guangzhou, China)
• 2008: First successful complete full double arm transplant by Edgar Biemer, Christoph Höhnke and Manfred Stangl (Technical University of Munich, Germany)
• 2008: First baby born from transplanted ovary by James Randerson
• 2008: First transplant of a human windpipe using a patient’s own stem cells, by Paolo Macchiarini (Barcelona, Spain)
• 2008: First successful transplantation of near total area (80%) of face, (including palate, nose, cheeks, and eyelid) by Maria Siemionow (Cleveland, USA)
• 2010: First full facial transplant, by Dr Joan Pere Barret and team (Hospital Universitari Vall d'Hebron on July 26, 2010 in Barcelona, Spain.)
• 2011: First double leg transplant, by Dr Cavadas and team (Valencia's Hospital La Fe, Spain)
• 2013: First successful entire face transplantation as an urgent life-saving surgery at Maria Skłodowska-Curie Institute of Oncology branch in Gliwice, Poland.

Types of transplant

Autograft

Main article: Autotransplantation

Transplant of tissue to the same person. Sometimes this is done with surplus tissue, or tissue that can regenerate, or tissues more desperately needed elsewhere (examples include skin grafts, vein extraction for CABG, etc.) Sometimes an autograft is done to remove the tissue and then treat it or the person, before returning it (examples include stem cell autograft and storing blood in advance of surgery). In a rotationplasty a distal joint is used to replace a more proximal one, typically a foot and ankle joint is used to replace a knee joint. The patient's foot is severed and reversed, the knee removed, and the tibia joined with the femur.

Allograft and allotransplantation

Main article: Allotransplantation

An allograft is a transplant of an organ or tissue between two genetically non-identical members of the same species. Most human tissue and organ transplants are allografts. Due to the genetic difference between the organ and the recipient, the recipient's immune system will identify the organ as foreign and attempt to destroy it, causing transplant rejection. The risk of transplant rejection can be estimated by measuring the Panel reactive antibody level.

Isograft

A subset of allografts in which organs or tissues are transplanted from a donor to a genetically identical recipient (such as an identical twin). Isografts are differentiated from other types of transplants because while they are anatomically identical to allografts, they do not trigger an immune response.

Xenograft and xenotransplantation

Main article: Xenotransplantation

A transplant of organs or tissue from one species to another. An example is porcine heart valve transplant, which is quite common and successful. Another example is attempted piscine-primate (fish to non-human primate) transplant of islet (i.e. pancreatic or insular tissue) tissue. The latter research study was intended to pave the way for potential human use, if successful. However, xenotransplantion is often an extremely dangerous type of transplant because of the increased risk of non-compatibility, rejection, and disease carried in the tissue.

Split transplants

Sometimes a deceased-donor organ, usually a liver, may be divided between two recipients, especially an adult and a child. This is not usually a preferred option because the transplantation of a whole organ is more successful.

Domino transplants

In patients with cystic fibrosis, where both lungs need to be replaced, it is a technically easier operation with a higher rate of success to replace both the heart and lungs of the recipient with those of the donor. As the recipient's original heart is usually healthy, it can then be transplanted into a second recipient in need of a heart transplant. Another example of this situation occurs with a special form of liver transplant in which the recipient suffers from familial amyloidotic polyneuropathy, a disease where the liver slowly produces a protein that damages other organs. The recipient's liver can then be transplanted into an older patient for whom the effects of the disease will not necessarily contribute significantly to mortality.

This term also refers to a series of living donor transplants in which one donor donates to the highest recipient on the waiting list and the transplant center utilizes that donation to facilitate multiple transplants. These other transplants are otherwise impossible due to blood type or antibody barriers to transplantation. The "Good Samaritan" kidney is transplanted into one of the other recipients, whose donor in turn donates his or her kidney to an unrelated recipient. Depending on the patients on the waiting list, this has sometimes been repeated for up to six pairs, with the final donor donating to the patient at the top of the list. This method allows all organ recipients to get a transplant even if their living donor is not a match to them. This further benefits patients below any of these recipients on waiting lists, as they move closer to the top of the list for a deceased-donor organ. Johns Hopkins Medical Center in Baltimore and Northwestern University's Northwestern Memorial Hospital have received significant attention for pioneering transplants of this kind.

In February 2012 the last link in a record sixty-person domino chain of thirty kidney transplants was completed.

ABO-incompatible transplants

Main article: ABO-incompatible transplantation

Because very young children (generally under 12 months, but often as old as 24 months) do not have a well-developed immune system, it is possible for them to receive organs from otherwise incompatible donors. This is known as ABO-incompatible (ABOi) transplantation. Graft survival and patient mortality is approximately the same between ABOi and ABO-compatible (ABOc) recipients. While focus has been on infant heart transplants, the principles generally apply to other forms of solid organ transplantation.

The most important factors are that the recipient not have produced isohemagglutinins, and that they have low levels of T cell-independent antigens. UNOS regulations allow for ABOi transplantation in children under two years of age if isohemagglutinin titers are 1:4 or below, and if there is no matching ABOc recipient. Studies have shown that the period under which a recipient may undergo ABOi transplantation may be prolonged by exposure to nonself A and B antigens. Furthermore, should the recipient (for example, type B-positive with a type AB-positive graft) require eventual retransplantation, the recipient may receive a new organ of either blood type.

Limited success has been achieved in ABO-incompatible heart transplants in adults, though this requires that the adult recipients have low levels of anti-A or anti-B antibodies. Kidney transplantation is more successful, with similar long-term graft survival rates to ABOc transplants.

Major organs and tissues transplanted

Main article: Transplantable organs and tissues

Thoracic organs

• Heart (Deceased-donor only)
• Lung (Deceased-donor and living-related lung transplantation)
• Heart/Lung (Deceased-donor and Domino transplant)

Abdominal organs

• Kidney (Deceased-donor and Living-Donor)
• Liver (Deceased-donor and Living-Donor)
• Pancreas (Deceased-donor only)
• Intestine (Deceased-donor and Living-Donor)
• Stomach (Deceased-donor only)
• Testis

Tissues, cells, fluids

• Hand (Deceased-donor only), see the first recipient Clint Hallam
• Cornea (Deceased-donor only) see the ophthalmologist Eduard Zirm
• Skin including Face replant (autograft) and Face transplant (extremely rare)
• Islets of Langerhans (Pancreas Islet Cells) (Deceased-donor and Living-Donor)
• Bone marrow/Adult stem cell (Living-Donor and Autograft)
• Blood transfusion/Blood Parts Transfusion (Living-Donor and Autograft)
• Blood vessels (Autograft and Deceased-Donor)
• Heart valve (Deceased-Donor, Living-Donor and Xenograft[Porcine/bovine])
• Bone (Deceased-Donor and Living-Donor)

Types of donor

Organ donors may be living, or may have died of brain death or circulatory death. Most deceased donors are those who have been pronounced brain dead. Brain dead means the cessation of brain function, typically after receiving an injury (either traumatic or pathological) to the brain, or otherwise cutting off blood circulation to the brain (drowning, sufficiation, etc.). Breathing is maintained via artificial sources, which, in turn, maintains heartbeat. Once brain death has been declared the person can be considered for organ donation. Criteria for brain death vary. Because less than 3% of all deaths in the U.S. are the result of brain death, the overwhelming majority of deaths are ineligible for organ donation, resulting in severe shortages.

Organ donation is possible after cardiac death in some situations, primarily when the patient is severely brain injured and not expected to survive without artificial breathing and mechanical support. Independent of any decision to donate, a patient's next-of-kin may decide to end artificial support. If the patient is expected to expire within a short period of time after support is withdrawn, arrangements can be made to withdraw that support in an operating room to allow quick recovery of the organs after circulatory death has occurred.

Tissue may be recovered from donors who die of either brain or circulatory death. In general, tissues may be recovered from donors up to 24 hours past the cessation of heartbeat. In contrast to organs, most tissues (with the exception of corneas) can be preserved and stored for up to five years, meaning they can be "banked." Also, more than 60 grafts may be obtained from a single tissue donor. Because of these three factors—the ability to recover from a non-heart beating donor, the ability to bank tissue, and the number of grafts available from each donor—tissue transplants are much more common than organ transplants. The American Association of Tissue Banks estimates that more than one million tissue transplants take place in the United States each year.

Living donor

In "living donors", the donor remains alive and donates a renewable tissue, cell, or fluid (e.g. blood, skin), or donates an organ or part of an organ in which the remaining organ can regenerate or take on the workload of the rest of the organ (primarily single kidney donation, partial donation of liver, lung lobe, small bowel). Regenerative medicine may one day allow for laboratory-grown organs, using patient'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 brain-stem dead donors, who have formed the majority of deceased donors for the last twenty 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;however given the scarcity of suitable organs and the number of people who die waiting, any potentially suitable organ must be considered.

Allocation of donated organs

In most countries there is a shortage of suitable organs for transplantation. Countries often have formal systems in place to manage the process of determining who is an organ donor and in what order organ recipients receive available organs.

The overwhelming majority of deceased-donor organs in the United States are allocated by federal contract to the Organ Procurement and Transplantation Network (OPTN), held since it was created by the Organ Transplant Act of 1984 by the United Network for Organ Sharing or UNOS. (UNOS does not handle donor cornea tissue; corneal donor tissue is usually handled by various eye banks.) Individual regional organ procurement organizations (OPOs), all members of the OPTN, are responsible for the identification of suitable donors and collection of the donated organs. UNOS then allocates organs based on the method considered most fair by the scientific leadership in the field. The allocation methodology varies somewhat by organ, and changes periodically. For example, liver allocation is based partially on MELD score (Model of End-Stage Liver Disease), an empirical score based on lab values indicative of the sickness of the patient from liver disease.

Experiencing somewhat increased popularity, but still very rare, is directed or targeted donation, in which the family of a deceased donor (often honoring the wishes of the deceased) requests an organ be given to a specific person. If medically suitable, the allocation system is subverted, and the organ is given to that person. In the United States, there are various lengths of waiting times due to the different availabilities of organs in different UNOS regions. In other countries such as the UK, only medical factors and the position on the waiting list can affect who receives the organ.

One of the more publicized cases of this type was the 1994 Chester and Patti Szuber transplant. This was the first time that a parent had received a heart donated by one of their own children. Although the decision to accept the heart from his recently killed child was not an easy decision, the Szuber family agreed that giving Patti’s heart to her father would have been something that she would have wanted.

Access to organ transplantation is one reason for the growth of medical tourism.

Reasons for donation and ethical issues

Living related donors

Living related donors donate to family members or friends in whom they have an emotional investment. The risk of surgery is offset by the psychological benefit of not losing someone related to them, or not seeing them suffer the ill effects of waiting on a list.

Paired exchange

Diagram of an exchange between otherwise incompatible pairs

A "paired-exchange" is a technique of matching willing living donors to compatible recipients using serotyping. For example a spouse may be willing to donate a kidney to their partner but cannot since there is not a biological match. The willing spouse's kidney is donated to a matching recipient who also has an incompatible but willing spouse. The second donor must match the first recipient to complete the pair exchange. Typically the surgeries are scheduled simultaneously in case one of the donors decides to back out and the couples are kept anonymous from each other until after the transplant.

Paired exchange programs were popularized in the New England Journal of Medicine article "Ethics of a paired-kidney-exchange program" in 1997 by L.F. Ross. It was also proposed by Felix T. Rapport in 1986 as part of his initial proposals for live-donor transplants "The case for a living emotionally related international kidney donor exchange registry" in Transplant Proceedings. A paired exchange is the simplest case of a much larger exchange registry program where willing donors are matched with any number of compatible recipients. Transplant exchange programs have been suggested as early as 1970: "A cooperative kidney typing and exchange program.".

The first pair exchange transplant in the U.S. was in 2001 at Johns Hopkins Hospital. The first complex multihospital kidney exchange involving 12 patients was performed in February 2009 by The Johns Hopkins Hospital, Barnes-Jewish Hospital in St. Louis and Integris Baptist Medical Center in Oklahoma City. Another 12-patient multihospital kidney exchange was performed four weeks later by Saint Barnabas Medical Center in Livingston, New Jersey, Newark Beth Israel Medical Center and New York-Presbyterian Hospital. Surgical teams led by Johns Hopkins continue to pioneer in this field by having more complex chain of exchange such as eight-way multihospital kidney exchange. In December 2009, a 13 organ 13 recipient matched kidney exchange took place, coordinated through Georgetown University Hospital and Washington Hospital Center, Washington DC.

Paired-donor exchange, led by work in the New England Program for Kidney Exchange as well as at Johns Hopkins University and the Ohio OPOs may more efficiently allocate organs and lead to more transplants.

Good Samaritan

Good Samaritan or "altruistic" donation is giving a donation to someone not well-known to the donor. Some people choose to do this out of a need to donate. Some donate to the next person on the list; others use some method of choosing a recipient based on criteria important to them. Web sites are being developed that facilitate such donation. It has been featured in recent television journalism that over half of the members of the Jesus Christians, an Australian religious group, have donated kidneys in such a fashion.

Compensated donation

See also: Organ theft, Organ sale, and Organ trade

In compensated donation, donors get money or other compensation in exchange for their organs. This practice is common in some parts of the world, whether legal or not, and is one of the many factors driving medical tourism.

An article by Gary Becker and Julio Elias on "Introducing Incentives in the market for Live and Cadaveric Organ Donations" said that a free market could help solve the problem of a scarcity in organ transplants. Their economic modeling was able to estimate the price tag for human kidneys ($15,000) and human livers ($32,000).

In the United States, The National Organ Transplant Act of 1984 made organ sales illegal. In the United Kingdom, the Human Organ Transplants Act 1989 first made organ sales illegal, and has been superseded by the Human Tissue Act 2004.

In 2007, two major European conferences recommended against the sale of organs.

Recent development of web sites and personal advertisements for organs among listed candidates has raised the stakes when it comes to the selling of organs, and have also sparked significant ethical debates over directed donation, "good-Samaritan" donation, and the current U.S. organ allocation policy. Bioethicist Jacob M. Appel has argued that organ solicitation on billboards and the internet may actually increase the overall supply of organs.

Two books, Kidney for Sale By Owner by Mark Cherry (Georgetown University Press, 2005); and Stakes and Kidneys: Why markets in human body parts are morally imperative by James Stacey Taylor: (Ashgate Press, 2005); advocate using markets to increase the supply of organs available for transplantation. In a 2004 journal article Economist Alex Tabarrok argues that allowing organ sales, and elimination of organ donor lists will increase supply, lower costs and diminish social anxiety towards organ markets.

Iran has had a legal market for kidneys since 1988, and the market price is of the order of US$1,200 for the recipient. The Economist and the Ayn Rand Institute approve and advocate a legal market elsewhere. They argued that if 0.06% of Americans between 19 and 65 were to sell one kidney, the national waiting list would disappear (which, the Economist wrote, happened in Iran). The Economist argued that donating kidneys is no more risky than surrogate motherhood, which can be done legally for pay in most countries.

In Pakistan, 40 percent to 50 percent of the residents of some villages have only one kidney because they have sold the other for a transplant into a wealthy person, probably from another country, said Dr. Farhat Moazam of Pakistan, at a World Health Organization conference. Pakistani donors are offered $2,500 for a kidney but receive only about half of that because middlemen take so much. In Chennai, southern India, poor fishermen and their families sold kidneys after their livelihoods were destroyed by the Indian Ocean tsunami on December 26, 2004. About 100 people, mostly women, sold their kidneys for 40,000–60,000 rupees ($900–$1,350). Thilakavathy Agatheesh, 30, who sold a kidney in May 2005 for 40,000 rupees said, "I used to earn some money selling fish but now the post-surgery stomach cramps prevent me from going to work." Most kidney sellers say that selling their kidney was a mistake.

In Cyprus in 2010 police closed a fertility clinic under charges of trafficking in human eggs. The Petra Clinic, as it was known locally, imported women from Ukraine and Russia for egg harvesting and sold the genetic material to foreign fertility tourists. This sort of reproductive trafficking violates laws in the European Union. In 2010 the Pulitzer Center on Crisis Reporting and the magazine Fast Company explored illicit fertility networks in Spain, the United States and Israel.

Forced donation

See also: Organ transplants in the People's Republic of China

There have been various accusations that certain authorities are harvesting organs from those the authorities deem undesirable, such as prison populations. The World Medical Association stated that individuals in detention are not in the position to give free consent to donate their organs. Illegal dissection of corpses is a form of body-snatching and may have taken place to obtain allografts.

According to the Chinese Deputy Minister of Health, Huang Jiefu, approximately 95% of all organs used for transplantation are from executed prisoners. The lack of public organ donation program in China is used as a justification for this practice. However, reports in the Chinese media raised concerns if executed criminals are the only source for organs used in transplants.

In October 2007, bowing to international pressure, the Chinese Medical Association agreed on a moratorium of commercial organ harvesting from condemned prisoners, but did not specify a deadline. China agreed to restrict transplantations from donors to their immediate relatives.

People in other parts of the world are responding to this availability of organs, and a number of individuals (including U.S. and Japanese citizens) have elected to travel to China or India as medical tourists to receive organ transplants which may have been sourced in what might be considered elsewhere to be unethical ways (see later).

Organ transplantation in different countries

Demographics

Despite efforts of international transplantation societies, it is not possible to access an accurate source on the number, rates and outcomes of all forms of transplantation globally; the best that we can achieve is estimations. This is not a sound basis for the future and thus one of the crucial strategies for the Global Alliance in Transplantation is to foster the collection and analysis of global data.

Transplantation of organs in different continents/regions year/ 2000

	Kidney (pmp*)	Liver (pmp)	Heart (pmp)
USA	52	19	8
Europe	27	10	4
Africa	11	3.5	1
Asia	3	0.3	0.03
Latin America	13	1.6	0.5

• All numbers per million population

Source: ,

According to the Council of Europe, Spain through the Spanish Transplant Organization led by Dr Rafael Matesanz shows the highest worldwide rate of 35.1 donors per million population in 2005 and 33.8 in 2006. In 2011, was 35.3 http://www.agenciasinc.es/Noticias/Espana-alcanza-un-record-historico-de-trasplantes-en-2011

In addition to the citizens waiting for organ transplants in the US and other developed nations, there are long waiting lists in the rest of the world. More than 2 million people need organ transplants in China, 50,000 waiting in Latin America (90% of which are waiting for kidneys), as well as thousands more in the less documented continent of Africa. Donor bases vary in developing nations.

Traditionally, Muslims believe body desecration in life or death to be forbidden, and thus many reject organ transplant. However most Muslim authorities nowadays accept the practice if another life will be saved.

In Latin America the donor rate is 40–100 per million per year, similar to that of developed countries. However, in Uruguay, Cuba, and Chile, 90% of organ transplants came from cadaveric donors. Cadaveric donors represent 35% of donors in Saudi Arabia. There is continuous effort to increase the utilization of cadaveric donors in Asia, however the popularity of living, single kidney donors in India yields India a cadaveric donor prevalence of less than 1 pmp.

Organ transplantation in China has taken place since the 1960s, and China has one of the largest transplant programmes in the world, peaking at over 13,000 transplants a year by 2004. Organ donation, however, is against Chinese tradition and culture, and involuntary organ donation is illegal under Chinese law. China's transplant programme attracted the attention of international news media in the 1990s due to ethical concerns about the organs and tissue removed from the corpses of executed criminals being commercially traded for transplants.

With regard to organ transplantation in Israel, there is a severe organ shortage due to religious objections by some rabbis who oppose all organ donations and others who advocate that a rabbi participate in all decision making regarding a particular donor. One third of all heart transplants performed on Israelis are done in the Peoples' Republic of China; others are done in Europe. Dr. Jacob Lavee, head of the heart-transplant unit, Sheba Medical Center, Tel Aviv, believes that "transplant tourism" is unethical and Israeli insurers should not pay for it. The organization HODS (Halachic Organ Donor Society) is working to increase knowledge and participation in organ donation among Jews throughout the world.

Transplantation rates also differ based on race, sex, and income. A study done with patients beginning long term dialysis showed that the sociodemographic barriers to renal transplantation present themselves even before patients are on the transplant list. For example, different groups express definite interest and complete pretransplant workup at different rates. Previous efforts to create fair transplantation policies had focused on patients currently on the transplantation waiting list.

Comparative costs

One of the driving forces for illegal organ trafficking and for “transplantation tourism” is the price differences for organs and transplant surgeries in different areas of the world. According to the New England Journal of Medicine, a human kidney can be purchased in Manila for $1000–$2000, but in urban Latin America a kidney may cost more than $10,000. Kidneys in South Africa have sold for as high as $20,000. Price disparities based on donor race are a driving force of attractive organ sales in South Africa, as well as in other parts of the world.

In China, a kidney transplant operation runs for around $70,000, liver for $160,000, and heart for $120,000 . Although these prices are still unattainable to the poor, compared to the fees of the United States, where a kidney transplant may demand $100,000, a liver $250,000, and a heart $860,000, Chinese prices have made China a major provider of organs and transplantation surgeries to other countries.

In India, a kidney transplant operation runs for around as low as $5000.

Safety

In the United States of America, tissue transplants are regulated by the U.S. Food and Drug Administration (FDA) which sets strict regulations on the safety of the transplants, primarily aimed at the prevention of the spread of communicable disease. Regulations include criteria for donor screening and testing as well as strict regulations on the processing and distribution of tissue grafts. Organ transplants are not regulated by the FDA.^{[citation needed]}

In November 2007, the CDC reported the first-ever case of HIV and Hepatitis C being simultaneously transferred through an organ transplant. The donor was a 38-year-old male, considered "high-risk" by donation organizations, and his organs transmitted HIV and Hepatitis C to four organ recipients. Experts say that the reason the diseases did not show up on screening tests is probably because they were contracted within three weeks before the donor's death, so antibodies would not have existed in high enough numbers to detect. The crisis has caused many to call for more sensitive screening tests, which could pick up antibodies sooner. Currently, the screens cannot pick up on the small number of antibodies produced in HIV infections within the last 90 days or Hepatitis C infections within the last 18–21 days before a donation is made.

NAT (nucleic acid testing) is now being done by many organ procurement organizations and is able to detect antibodies for HIV and Hepatitis C within seven to ten days of exposure to the virus.

Organ transplant laws

Both developing and developed countries have forged various policies to try to increase the safety and availability of organ transplants to their citizens. Brazil, France, Italy, Poland and Spain have ruled all adults potential donors with the “opting out” policy, unless they attain cards specifying not to be. However, whilst potential recipients in developing countries may mirror their more developed counterparts in desperation, potential donors in developing countries do not. The Indian government has had difficulty tracking the flourishing organ black market in their country and have yet to officially condemn it. Other countries victimized by illegal organ trade have implemented legislative reactions. Moldova has made international adoption illegal in fear of organ traffickers. China has made selling of organs illegal as of July 2006 and claims that all prisoner organ donors have filed consent. However, doctors in other countries, such as the United Kingdom, have accused China of abusing its high capital punishment rate. Despite these efforts, illegal organ trafficking continues to thrive and can be attributed to corruption in healthcare systems, which has been traced as high up as the doctors themselves in China, Ukraine, and India, and the blind eye economically strained governments and health care programs must sometimes turn to organ trafficking. Some organs are also shipped to Uganda and the Netherlands. This was a main product in the triangular trade in 1934^{[citation needed]}.

Starting on May 1, 2007, doctors involved in commercial trade of organs will face fines and suspensions in China. Only a few certified hospitals will be allowed to perform organ transplants in order to curb illegal transplants. Harvesting organs without donor's consent was also deemed a crime.

On June 27, 2008, Indonesian, Sulaiman Damanik, 26, pleaded guilty in Singapore court for sale of his kidney to CK Tang's executive chair, Tang Wee Sung, 55, for 150 million rupiah (S$ 22,200). The Transplant Ethics Committee must approve living donor kidney transplants. Organ trading is banned in Singapore and in many other countries to prevent the exploitation of "poor and socially disadvantaged donors who are unable to make informed choices and suffer potential medical risks." Toni, 27, the other accused, donated a kidney to an Indonesian patient in March, alleging he was the patient's adopted son, and was paid 186 million rupiah (20,200 USD). Upon sentence, both would suffer each, 12 months in jail or 10,000 Singapore dollars (7,600 USD) fine.

In an article appearing in the Econ Journal Watch, April 2004. economist Alex Tabarrok examined the impact of direct consent laws on transplant organ availability. Tabarrok found that social pressures resisting the use of transplant organs decreased over time as the opportunity of individual decisions increased. Tabarrok concluded his study suggesting that gradual elimination of organ donation restrictions and move to a free market in organ sales will increase supply of organs and encourage broader social acceptance of organ donation as a practice.

Ethical concerns

Main article: Ethics of organ transplantation

The existence and distribution of organ transplantation procedures in developing countries, while almost always beneficial to those receiving them, raise many ethical concerns. Both the source and method of obtaining the organ to transplant are major ethical issues to consider, as well as the notion of distributive justice. The World Health Organization argues that transplantations promote health, but the notion of “transplantation tourism” has the potential to violate human rights or exploit the poor, to have unintended health consequences, and to provide unequal access to services, all of which ultimately may cause harm. Regardless of the “gift of life”, in the context of developing countries, this might be coercive. The practice of coercion could be considered exploitative of the poor population, violating basic human rights according to Articles 3 and 4 of the Universal Declaration of Human Rights. There is also a powerful opposing view, that trade in organs, if properly and effectively regulated to ensure that the seller is fully informed of all the consequences of donation, is a mutually beneficial transaction between two consenting adults, and that prohibiting it would itself be a violation of Articles 3 and 29 of the Universal Declaration of Human Rights.

Even within developed countries there is concern that enthusiasm for increasing the supply of organs may trample on respect for the right to life. The question is made even more complicated by the fact that the "irreversibility" criterion for legal death cannot be adequately defined and can easily change with changing technology.

Artificial organ transplantation

Surgeons in Sweden performed the first implantation of a synthetic trachea in July 2011, for a 36-year-old patient who was suffering from cancer. Stem cells taken from the patient's hip were treated with growth factors and incubated on a plastic replica of his natural trachea.

References

Sources and bibliography

• Budiani-Saberi, Debra A.; Delmonico, Francis L. (2008). "Organ Trafficking and Transplant Tourism: A Commentary on the Global Realities". American Journal of Transplantation 8 (5): 925–929. doi:10.1111/j.1600-6143.2008.02200.x. PMID 18416734. 
• Caplan, Arthur L.; Coelho, Daniel H. (eds.) (1998). The Ethics of Organ Transplants: The Current Debate. New York: Prometheus Books. ISBN 1-57392-224-2. 
• Cooper, David K.C.; Lanza, Robert P. (2000). Xeno: The Promise of Transplanting Animal Organs into Humans. Oxford: Oxford University Press. p. 304. ISBN 978-0-19-512833-8. 
• Danovitch, Gabriel M.; Delmonico, Francis L. (2008). "The prohibition of kidney sales and organ markets should remain". Current Opinion in Organ Transplantation (Renal transplantation: Edited by Robert A. Montgomery) 13 (4): 386–394. doi:10.1097/MOT.0b013e3283097476. 
• Gruessner, Rainer; Benedetti, Enrico (2008). Living Donor Organ Transplantation. New York: McGraw-Hill Inc. p. 791. ISBN 978-0-07-145549-7. 
• McLean, Shella A.M.; Williamson, Laura (2005). Xenotransplantation: Law and Ethics. Aldershot: Ashgate Publishing ltd. p. 290. ISBN 0-7546-2379-3. 
• Sayeed, Sadath A. (2009). "Teaching ethics and trading organs". Indian Journal of Medical Ethics 6 (1): 25–27. PMID 19241951. 
• Shimazono, Yosuke (2007). "The state of the international organ trade: a provisional picture based on integration of available information". Bulletin of the World Health Organization 85 (12): 901–980. PMC 2636295. PMID 18278256. 
• Trzepacz, Paula T.; DiMartini, Andrea F. (2000). The Transplant Patient: Biological, Psychiatric, and Ethical Issues in Organ Transplantation. Cambridge / New York: Cambridge University Press. p. 311. ISBN 0-521-55354-7. 
• World Health Organization (2008). Human organ and tissue transplantation. Geneva / New York: WHO. p. 13. 
• collective (2008). "Organ trafficking and transplant tourism and commercialism: the Declaration of Istanbul". The Lancet 372 (9632): 5–6. doi:10.1016/S0140-6736(08)60967-8. PMID 18603141. 
• Appel, Jacob M.; Fox, Mark D. (2005). "Organ Solicitation on the Internet: Every Man for Himself?". Hastings Center Report 35 (3): 14–15. doi:10.1353/hcr.2005.0052. PMID 16092393. 
• Lock, Margaret M. (2002). Twice Dead: Organ Transplants and the Reinvention of Death. Berkeley: University of California Press. ISBN 0-520-22605-4. 
• Morris PJ (December 2004). "Transplantation—a medical miracle of the 20th century". N. Engl. J. Med. 351 (26): 2678–80. doi:10.1056/NEJMp048256. PMID 15616201. 
• Finn, Robert (2000). Organ Transplants: Making the Most of Your Gift of Life. Patient Center Guides. ISBN 1-56592-634-X. 
• Hu W, Lu J, Zhang L, et al. (October 2006). "A preliminary report of penile transplantation". Eur. Urol. 50 (4): 851–3. doi:10.1016/j.eururo.2006.07.026. PMID 16930814. 
• Taylor, James S. (2005). Stakes and Kidneys: Why Markets in Human Body parts are Morally Imperative. Aldershot, Hants, England: Ashgate. ISBN 0-7546-4109-0. 
• Köchler, Hans, ed. (2001). Transplantationsmedizin und personale Identität. Medizinische, ethische, rechtliche und theologische Aspekte der Organverpflanzung. (Transplantation Medicine and Personal Identity. Medical, Ethical, Legal and Theological Aspects of Organ Transplantation / German) Frankfurt a. M. etc.: Peter Lang. ISBN 3-631-38363-0
• Cherry, Mark J. (2005). Kidney For Sale By Owner: Human Organs, Transplantation, And The Market. Washington, D.C: Georgetown University Press. ISBN 1-58901-040-X. 

Further reading

• Gerritsen, T. (1996). Harvest. New York: Pocket Books.
• Gutkind, L. (1990). Many Sleepless Nights: The World of Organ Transplantation. New York: W. W. Norton & Company, Inc.
• Picoult, J.. (2008). Change of Heart. New York: Simon & Schuster, Inc.
• Schlich, T. (2010). The Origins of Organ Transplantation: Surgery and Laboratory Science, 1880-1930, University of Rochester Press.

External links

• Organ Transplant survival rates from the Scientific Registry of Transplant Recipients
• Multi Organ Transplant
• Liver Transplant Procedure description – by Children's Hospital of Pittsburgh
• The Gift of a Lifetime – Online Educational Documentary
• The short film A Science of Miracles (2009) is available for free download at the Internet Archive [more]
• "Overcoming the Rejection Factor: MUSC's First Organ Transplant" Waring Historical Library online exhibit

UpToDate Contents

全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.

• 1. 小腸および多臓器移植の概要 overview of intestinal and multivisceral transplantation
• 2. 小児における短腸症候群のマネージメント management of the short bowel syndrome in children
• 3. 成人における短腸症候群のマネージメント management of the short bowel syndrome in adults
• 4. 慢性偽性腸閉塞 chronic intestinal pseudo obstruction
• 5. 短腸症候群の病態生理 pathophysiology of the short bowel syndrome

English Journal

• Composite elastomeric polyurethane scaffolds incorporating small intestinal submucosa for soft tissue engineering.

• Da L1, Gong M1, Chen A1, Zhang Y1, Huang Y1, Guo Z2, Li S3, Li-Ling J4, Zhang L2, Xie H5.
• Acta biomaterialia.Acta Biomater.2017 Sep 1;59:45-57. doi: 10.1016/j.actbio.2017.05.041. Epub 2017 May 17.
• PMID 28528117

• Anesthesia for Intestinal Transplantation.

• Nguyen-Buckley C1, Wong M2.
• Anesthesiology clinics.Anesthesiol Clin.2017 Sep;35(3):509-521. doi: 10.1016/j.anclin.2017.04.007. Epub 2017 Jul 5.
• PMID 28784223

• Clinical impact of pre-transplant gut microbial diversity on outcomes of allogeneic hematopoietic stem cell transplantation.

• Doki N1, Suyama M2,3, Sasajima S3, Ota J4, Igarashi A4, Mimura I5, Morita H5, Fujioka Y6,7, Sugiyama D8, Nishikawa H6,8, Shimazu Y9, Suda W10,11, Takeshita K11, Atarashi K11, Hattori M10,12, Sato E13, Watakabe-Inamoto K4, Yoshioka K4, Najima Y4, Kobayashi T4, Kakihana K4, Takahashi N7, Sakamaki H4, Honda K3,11, Ohashi K4.
• Annals of hematology.Ann Hematol.2017 Sep;96(9):1517-1523. doi: 10.1007/s00277-017-3069-8. Epub 2017 Jul 21.
• PMID 28733895

Japanese Journal

• 本邦小腸移植症例登録報告

• 上野 豪久,福澤 正洋
• 移植 46(6), 559-561, 2011-12-10
• NAID 10030209420

• 同種造血幹細胞移植後の小腸穿孔で診断された Epstein-Barr virus 関連移植後リンパ増殖性疾患

• 相本 瑞樹,山根 孝久,井上 敦司 [他],百瀬 大,相本 蘭,井上 恵里,岡本 秀一郎,康 秀男,中根 孝彦,武岡 康信,中前 美佳,小坂 さおり,寺田 芳樹,中前 博久,高 起良,中尾 隆文,大澤 政彦,日野 雅之
• 臨床血液 51(12), 1775-1780, 2010-12-30
• NAID 10027751552

• 本邦小腸移植症例登録報告

• 日本小腸移植研究会
• 移植 45(6), 652-654, 2010-12-10
• NAID 10027810691

Related Links

• Intestinal Transplantation - Medscape Reference

5 Mar 2012 ... Intestinal Transplantation. As with the transplantation of other organs, the history of intestinal transplantation begins with Carrel and his description of a method of performing vascular anastomosis.

Related Pictures

---

★リンクテーブル★

関連記事	「transplant」「intestinal」

「transplant」

　　[★]

• n.

• 移植片、移植

• v.

• 移植する

関

cell transplant、engraft、engraftment、explant、graft、grafting、implant、implantation、organ graft、organ transplant、tissue graft、tissue transplant、transfer、transplant recipient、transplantation

　 　 　 　 　 　

「intestinal」

　　[★]

• adj.

• 腸の、腸管の、腸管内の、消化器系の

関

alimentary system、bowel、digestive system、enteric、enteric canal、entero、gastrointestinal、gastrointestinal system、GI、gut、intestinal tract、intestine