अंग प्रत्यारोपण

नेपाली विकिपीडियाबाट
यसमा जानुहोस्: परिचालन, खोज्नुहोस्

An organ transplant is the transplantation of a whole or partial organ from one body to another (or from a donor site on the patient's own body), for the purpose of replacing the recipient's damaged or failing organ with a working one from the donor site. Organ donors can be living, or deceased (previously referred to as cadaveric).

प्रत्यारोपणका प्रकार[सम्पादन गर्ने]

Autograft[सम्पादन गर्ने]

A transplant of tissue from one to oneself. 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 this is done to remove the tissue र then treat it or the person, before returning it (examples include stem-cell autograft र storing blood in advance of surgery).

Allograft[सम्पादन गर्ने]

An allograft is a transplanted organ or tissue from a genetically non-identical member of the same species. Most human tissue र organ transplants are allografts.

Isograft[सम्पादन गर्ने]

A subset of allografts in which organs or tissues are transplanted from one to a genetically identical other (such as an identical twin). This is differentiated because though it is anatomically identical to an allograft, it is closer to an autograft in terms of immunology.

Xenograft[सम्पादन गर्ने]

A transplant of organs or tissue from one species to another. Examples include porcine heart valves, which are quite common र successful, a baboon-to-human heart (failed), र piscine-primate (fish to non-human primate) islet (i.e. pancreatic or insular tissue), the latter's research study directed for potential human use if successful.

Major Organs र Tissues Transplanted[सम्पादन गर्ने]

Solid Organs[सम्पादन गर्ने]

Thoracic Organs[सम्पादन गर्ने]

Abdominal Organs[सम्पादन गर्ने]

  • Liver (Deceased-donor र Living-Donor)
  • Kidney (Deceased-donor र Living-Donor)
  • Pancreas (Deceased-donor र rarely Living-Donor)
  • Small bowel (Small Intestine) (Deceased-donor र Living-Donor)
  • Kidney-Pancreas (Sometimes simultaneous, sometimes in separate procedures) (Deceased-donor, Living-Donor, र combined deceased/living (e.g. kidney from living donor, pancreas from deceased donor))
  • Combined Liver-Kidney (Generally Deceased-donor only)
  • Combined Liver-Small Bowel (Deceased-donor only)

Other Organs[सम्पादन गर्ने]

Tissues, Cells, र Fluids[सम्पादन गर्ने]

Types of Donor[सम्पादन गर्ने]

Living[सम्पादन गर्ने]

In living donors, the donor remains alive र 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, small bowel, or pancreas).

Living-Related[सम्पादन गर्ने]

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.

A "paired-exchange" is a technique of matching willing living donors to compatible recipients. For example a spouse may be more than willing to donate a kidney to their partner but cannot since there is not a biological match. 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 र 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 १९९७ by L.F. Ross [१]. It was also proposed by Felix T. Rapport [२] in १९८६ as part of उनका initial proposals for live-donor transplants "The case for a living emotionally related international kidney donor exchange registry" in Transplant Proceedings[३]. 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 [४]. A transplant exchange programs have been suggested as early as १९७०: "A cooperative kidney typing र exchange program."[५]. The first pair exchange transplant in the U.S. was in २००१ at John Hopkins hospital [६].

"Good Samaritan"[सम्पादन गर्ने]

"Good Samaritan" or "altruistic" donation is giving 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 [७].

Compensated / coerced[सम्पादन गर्ने]

Each year, impoverished people sell their kidneys to be used in transplants. Additionally, some authorities may mandate organ donation from unwilling donors such as prisoners. The size र scope of these events are not well-documented र is probably not known. The National Organ Transplant Act of १९८४ made illegal any profit from organ donation in the United States; careful regulation by the OPTN has probably eliminated organ sales in the United States. Recent development of web sites such as *MatchingDonors.com र personal advertisements for organs among listed candidates has raised the possibility of selling organs once again, as well as sparking significant ethical debates over directed donation, "good-Samaritan" donation, र the current U.S. organ allocation policy. Recently, two books have been published that advocate using markets to increase the supply of organs available for transplantation. The first is by Mark Cherry: Kidney for Sale By Owner (Georgetown University Press, २००५). The second is by James Stacey Taylor: Stakes र Kidneys: Why markets in human body parts are morally imperative (Ashgate Press, २००५).

Deceased (formerly cadaveric)[सम्पादन गर्ने]

Deceased donors are donors who have been declared brain-dead र 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 Cardiac Death - DCD- Donors (formerly non-heart beating donors) to increase the potential pool of donors as demand for transplants continues to grow. These organs have inferior outcomes to organs from a brain-dead donor; however given the scarcity of suitable organs र the number of people who die waiting, any potentially suitable organ must be considered.

In China a notable category of donors is that of executed prisoners ([८], see FAQ).

Allocated[सम्पादन गर्ने]

The overwhelming majority of deceased-donor organs in the United States are allocated by federal contract to the Organ Procurement र Transplantation Network (OPTN), held since it was created by the Organ Transplant Act of 1984 by the United Network for Organ Sharing. This allocates organs based on the method considered most fair by the scientific leadership in the field. For kidneys, for instance, that is by waiting time; for livers, it is by MELD (Model of End-Stage Liver Disease), an empirical score based on lab values indicative of the sickness of the patient from liver disease.

Directed[सम्पादन गर्ने]

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, र the organ is given to that person.

One of the more publicized cases of this type was the १९९४ Chester र 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 their recently killed child was not an easy decision, the Szuber family agreed that giving Patti’s heart to उनको father would have been something that she would have wanted.

Body-snatching[सम्पादन गर्ने]

Illegal dissection of corpses is a form of body-snatching र may have taken place to obtain allografts. [९]

Special Types[सम्पादन गर्ने]

Split Liver Transplants[सम्पादन गर्ने]

Sometimes, a deceased-donor liver may be divided between two recipients, especially an adult र a child. This is uncommon, as the outcomes are worse for both patients than had they received the whole organ.

Domino Transplants[सम्पादन गर्ने]

This operation is usually performed for cystic fibrosis as both lungs need to be replaced र it is a technically easier operation to replace the heart र lungs en bloc. As the recipient's native heart is usually healthy, this can then itself be transplanted into someone needing a heart transplant. That term is also used for a special form of liver transplant, in which the recipient suffers from familial amyloidotic polyneuropathy in which the liver (slowly) produces a protein that damages other organs; their liver can be transplanted into an older patient who is likely to die from other causes before a problem arises [१०].

History[सम्पादन गर्ने]

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

Several apocryphal accounts of transplants exist well prior to the scientific understanding र advancements that would be necessary for them to have actually occurred. The Chinese physician Pien Ch-iao 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 mythology reports the third-century saints Damian र 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 fourth century A.D., decades after their death; some accounts have them only instructing living surgeons who performed the procedure.

More likely accounts exist in the area of skin transplantation. The first reasonable account is of the Indian surgeon Sushruta in the second century B.C., who used autografted skin transplantation in nose reconstruction rhinoplasty. Success or failure of these procedures is not well documented. Centuries later, the Italian surgeon Gaspare 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 र power of individuality" in उनका १५९६ work De Curtorum Chirurgia per Insitionem.

The first successful corneal allograft transplant was performed in १८३७ in a gazelle model; the first successful human corneal transplant, a keratoplastic operation, was performed by Eduard Zirm in Austria in १९०५. Pioneering work in the surgical technique of transplantation was made in the early १९००s by the French surgeon Alexis Carrel, with Charles Guthrie, with the transplantation of arteries or veins. Their skillful anastomosis operations, the new suturing techniques, laid the groundwork for later transplant surgery र won Carrel the १९१२ Nobel Prize for Medicine or Physiology. From 1902 Carrel performed transplant experiments on dogs. Surgically successful in moving kidneys, heartsspleens, he was one of the first to identify the problem of rejection, which remained insurmountable for decades.

Major steps in skin transplantation occurred during WW I, notably in the work of Harold Gillies at Aldershot. Among उनका 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 WW II as reconstructive surgery. In १९६२ the first successful replantation surgery was performed - re-attaching a severed limb र restoring (limited) functioning र feeling.

The first attempted human deceased-donor transplant was performed by the Ukrainian surgeon Yu Yu Voronoy in the १९३०s; rejection resulted in failure. Joseph Murray performed the first successful transplant, a kidney transplant between identical twins, in १९५४, successful because no immunosuppression was necessary in genetically identical twins.

In the late १९४०s Peter Medawar, working for the National Institute for Medical Research, improved the understanding of rejection. Identifying the immune reactions in १९५१ Medawar suggested that immunosuppressive drugs could be used. Cortisone had been recently discovered र the more effective azathioprine was identified in १९५९, but it was not until the discovery of cyclosporine in १९७० 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 १९६७.

The heart was a major prize for transplant surgeons. But, as well as 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 १९६४, but 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 December 3rd 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 १९६८-६९, but almost all the patients died within sixty days. Barnard's second patient, Philip Blaiberg, lived for १९ months.

As mentioned, it was the advent of cyclosporine that altered transplants from research surgery to life-saving treatment. In १९६८ surgical pioneer Denton Cooley performed seventeen transplants including the first heart-lung transplant. Fourteen of उनका patients were dead within six months. By १९८४ two-thirds of all heart transplant patients survived for five years or more. With organ transplants becoming commonplace, limited only by donors, surgeons moved onto more risky fields, multiple organ transplants on humans र whole-body transplant research on animals. On March 9th 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.

History of successful transplants:

  • १९५४: First successful kidney transplant by Joseph Murray (Boston)
  • १९६६: First successful pancreas transplant by Richard Lillehei र William Kelly (Minnesota)
  • १९६७: First successful liver transplant by Thomas Starzl (Pittsburgh)
  • १९६७: First successful heart transplant by Christiaan Barnard (South Africa)
  • १९७०: First successful monkey head transplant by Robert White (Cleveland, U.S.A.)
  • १९८१: First successful heart/lung transplant by Bruce Reitz (Stanford)
  • १९८३: First successful lung lobe transplant by Joel Cooper (Toronto)
  • १९८६: First successful double-lung transplant (Ann Harrison) by Joel Cooper (Toronto)
  • १९८७: First successful whole lung transplant by Joel Cooper (St. Louis)
  • १९९५: First successful laparoscopic live-donor nephrectomy by Lloyd Ratner र Louis Kavoussi (Baltimore)
  • १९९८: First successful live-donor partial pancreas transplant by David Sutherland (Minnesota)
  • १९९८: First successful hand transplant (France)
  • २००५: First successful partial face transplant (France)

As successful transplants र modern immunosuppression such as Tacrolimus (Prograf) in १९९४, Mycophenolic acid (Cellcept or Myfortic) र Prednisone unsually used in conjunction with Ciclosporin make transplants more common र have improved the survival rate as these drugs are more effective in many patients than the previous generation of immunosuppression drugs. A new form of Ciclosporin is in clinical trials it is an Inhaled Cyclosporine र is being developed by Chiron Corp., the need for more organs has become critical. Advances in living-related donor transplants have made that 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 one diabetes. However, there are still many problems that would need to be solved before they would be feasible options in patients requiring transplants.

विकासशील देशहरुमा अंग प्रत्यारोपण[सम्पादन गर्ने]

Demographics[सम्पादन गर्ने]

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

Transplantation of organs in different continents/regions year २०००







USA ५२ १९
Europe २७ १०
Asia ०.३ ०.०३
Latin America १३ १.६ ०.५
  • All numbers per million population

Source: [११]

In addition to the citizens waiting for organ transplants in the US र other developed nations, there are astounding waiting lists in the rest of the world. More than २ million people need organ transplants in China, ५०,००० waiting in Latin America (९०% of which are waiting for kidneys), as well as thousands more in the less documented continent of Africa. Donor bases vary in developing nations.

In Latin America the donor rate is donor rate ४०-१०० per million per year, similar to that of developed countries. However, in Uruguay, Cuba, र Chile, ९०% of organ transplants came from cadaveric donors. Cadaveric donors represent ३५% 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 १ pmp. China’s organ source statistics are still shrouded र controversial, but close relative donations are known to represent only २% of transplants, ५०% less than that in the United States.

Comparative Costs[सम्पादन गर्ने]

One of the driving forces for illegal organ trafficking र “transplantation tourism” is the price differences for organs र transplant surgeries in different areas of the world. According the New England Journal of Medicine, a human kidney can be purchased in Manila for $१०००– $२०००, but in urban Latin America a kidney may cost more than $१०,०००. Kidneys in South Africa have sold for as high as $२०,०००. 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. The Voluntary Health Association of India reports the prospect of such a small fortune has enticed about २,००० impoverished Indians to sell a kidney every year. In China, a kidney transplant operation runs for around $७०,०००, liver for $१६०,०००, र heart for $१२०,०००. Although these prices are still unattainable to the poorer citizens of the world, especially those whose governments offer little or no financial health care support, compared to the fees of the United States, where a kidney transplant may demand $१००,०००, a liver $२५०,०००, र a heart $८६०,०००, Chinese prices have made China a major provider of organs र transplantation surgeries to other countries.

Transplantation Safety[सम्पादन गर्ने]

Inadequate precaution, illegal organ trade, र higher presence of diseases such as HIV, hepatitis, र malaria present greater health safety dangers to both organ donors र recipients in developing countries. In Latin American countries that do not screen blood र organ donations for Chagas disease, the risk of infection may be as high as २०%. Indian doctors fear that for every HIV-positive potential kidney donor caught, another ५ may slip through screening. Compensation for donors also increases the risk of introducing diseased organs to recipients because these donors often yield from poorer populations unable to receive health care regularly र organ dealers may evade disease screening processes. The majority of such deals include one major payment र no follow up care for the donor. Some cases argue that there is a possibility of १:१८ to acquire HIV from such transplants.

Organ Transplant Legislation[सम्पादन गर्ने]

Developing countries have forged various policies to try to increase the safety र availability of organ transplants to their citizens. Poland र Brazil 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 सरकार has had difficulty tracking the flourishing organ black market in their country र 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 २००६ र 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 र can be attributed to corruption in healthcare systems, which has been traced as high up as the doctors themselves in China, Ukraine, र India, र the blind eye economically strained governments र health care programs must sometimes turn to organ trafficking. Some organ deals are also insulated: Japanese citizens living in China can take advantage of Japan’s strict organ transplant laws र sell Chinese organs to Japanese citizens at home.

Ethical Concerns[सम्पादन गर्ने]

The existence र distribution of organ transplantation procedures in developing countries, while often beneficial to those receiving them, raise many ethical concerns. Both the source र 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, र 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 is coercive. The practice of coercion could be considered exploitative of the poor population, violating basic human rights according to Articles ३ र ४ of the Universal Declaration of Human Rights. Access to transplants is even more limited in developing countries since the rate of transplants are lower than those of the developed countries.

Recent developments[सम्पादन गर्ने]

Steroid-Free Immunosuppression[सम्पादन गर्ने]

Steroid-free immunosuppression is being pioneered on large scale at Northwestern University in Chicago र other smaller institutions, while steroid minimization is being employed at the University of Wisconsin at Madison र other smaller institutions. This would avoid the side-effects of steroids. While short-term outcomes are outstanding, long-term outcomes are still unknown.

Calcineurin-Inhibitor-Free Immunosuppression[सम्पादन गर्ने]

Calcineurin-Inhibitor-Free Immunosuppression is currently undergoing extensive trialing, the result of which would be to allow sufficient immunosuppression, without the nephrotoxicity associated with standard regimens that include calcineurin inhibitors. Positive results have yet to be demonstrated in any trial.

Paired-Donor Exchange[सम्पादन गर्ने]

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

Notable people having had organ transplants[सम्पादन गर्ने]

  • George Best (१९४६–२००५); British football player र alcoholic (liver, २००२).
  • Aron Eisenberg (b. १९६९); Actor Star Trek: Deep Space Nine (kidney)
  • Jimmy Little (b. 19XX); Australian country/rock artist (kidney, २००४).
  • Jonah Lomu (b. १९७५); New Zealand rugby union player (Kidney, २००४).
  • Charles Perkins (१९३६–२०००); Australian soccer player, Aboriginal activist र सरकार minister; on उनका death was the world's longest surviving kidney transplant survivor (kidney, १९७२).
  • George Lopez (b. १९६१); Actor-Comedian received kidney transplant from उनका wife, Ann Lopez.
  • Robert Altman; Director of films, received a heart transplant mid-१९९०s (announced at the २००६ Academy Awards).
  • Jim Nabors; Actor-singer-comedian, best known for playing Gomer Pyle in the sitcom of the same name (liver).
  • David Crosby (b. 1941); Rock-folk singer (liver).
  • Mickey Mantle (1931-1995); Hall of Fame baseball player, notorious alcoholic (liver, १९९५; Mantle died a couple of months later of liver cancer, which had spread to उनका new liver).
  • Larry Hagman (b. १९३१); Actor, best known for playing J.R. Ewing on the soap opera Dallas (liver).
  • Gary Coleman (b. 1968); Actor who played Arnold on Diff'rent Strokes (two kidney transplants).
  • Shelley Fabares (b. 1944); Actress र singer who starred on the sitcom Coach (liver, २०००).
  • Alonzo Mourning (b. 1970); NBA basketball star (kidney, २००३; Mourning made history by returning to play in the NBA following उनका surgery).

References[सम्पादन गर्ने]

  • Lock, M. (२००२) Twice Dead: Organ Transplants र the Reinvention of Death. Berkeley, CA: University of California Press. ISBN ०-५२०-२२६०५-४.
  • Morris, PJ. Transplantation — A Medical Miracle of the २०th Century. N Engl J Med २००४;३५१:२६७८-८०. PMID १५६१६२०१.
  • Finn, R. (२०००). Organ Transplants: Making the Most of Your Gift of Life. Sebastopol: O'Reilly & Associates. ISBN १-५६५९२-६३४-X.

External links[सम्पादन गर्ने]

Scientific/Academic Societies[सम्पादन गर्ने]

Journalism[सम्पादन गर्ने]

Philanthropy/Support[सम्पादन गर्ने]

Cellular memory[सम्पादन गर्ने]

United States Federally Contracted Services[सम्पादन गर्ने]

Websites critical of legislation prohibiting organ selling[सम्पादन गर्ने]

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