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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature genetics 5 (1993), S. 210-213 
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] There are numerous goals to be satisfied when compiling a list of criteria for the choice of kidneys in transplant operations: to demonstrate objectivity, to improve transplant outcome, to be fair to all on the waiting list, to be timely (kidneys have a finite preservation time) and to limit costs. ...
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    World journal of surgery 1 (1977), S. 185-193 
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé La justification des transplantations du pancréas repose sur l'hypothèse du dérangement métabolique. Cette hypothèse, qui repose sur des preuves trés convainquantes, veut que les lésions vasculaires associées au diabète soient secondaires à une perturbation du métabolisme. Les résultats de la transplantation de pancréas entier ont été décevants: un seul des 47 patients rapportés au régistre des transplantations de l'ACS/NIH est actuellement vivant. Les phénomènes de rejet et les complications reliées à la fonction exocrine du pancréas ou à la transplantation concomitante du duodénum ont constitué les difficultés les plus importantes. Expérimentalement la transplantation du pancréas entier peut se prÊter à différentes approches: une portion seulement de la glande peut-Être transplantée en position rétro-péritonéale; les canaux pancréatiques peuvent Être ligaturés ou anastomosés à l'uretère ou à une anse en y de Roux. La transplantation des ilÔts de Langhérans sous forme de greffe libre constitue une alternative à la transplantation du pancréas entier. Sur le plan expérimental, l'injection intra-portale ou intra-péritonéale d'ilÔts de Langhérans adultes, de pancréas néonatal dispersé ou de fragments pancréatiques adultes après inactivation des ferments digestifs, peut effectivement améliorer le diabète. Chez le chien, ces fragments pancréatiques ont été transplantés dans la rate. Sur le plan clinique, les premières tentatives ont consisté en l'injection de petites quantités d'ilÔts purifiés. Certains receveurs ont vu diminuer leurs besoins en insuline, mais à date on a pas réussi chez l'homme à transplanter efficacement des ilÔts de Langhérans. Les principales difficultés sont reliées au rejet des greffons et au procurement des ilÔts, mais le laboratoire a déjà commencé à apporter des amorces de solution. L'intérÊt de la transplantation du pancréas chez l'homme réside dans le fait que cette approche prévient ou contrÔle le développement des lésions secondaires au diabète expérimental.
    Notes: Abstract Considerable evidence supports the hypothesis that the microangiopathic lesions of diabetes are secondary to disordered metabolism. This hypothesis underlies the rationale for whole pancreas and islet transplantation. Whole pancreas transplantation has had limited clinical success—only 1 of 47 recipients reported to the ACS/NIH Transplant Registry is currently alive. Major problems have been allograft rejection and complications related to either the exocrine pancreas or concomitant transplantation of the duodenum. Experimental approaches to whole pancreas transplantation include use of duct-ligated organs or extraperitoneal transplantation of segmental grafts, with exocrine duct drainage established to either host ureter or a retroperitoneal Roux-en-y loop of bowel. The difficulties with whole pancreas transplantation have stimulated the development of techniques allowing transplantation of islet tissue as a free graft. Transplantation of purified adult islets, of dispersed neonatal pancreas, or of adult pancreatic fragments with exocrine enzymes inactivated can effectively ameliorate experimental diabetes when transplanted to either the intraperitoneal or portal vein sites. In dogs, adult pancreatic fragments containing both islet and exocrine tissue components can effectively ameliorate diabetes when transplanted to the spleen. The first clinical trials of islet transplantation used only small quantities of purified islets. Although insulin requirements of some recipients were reduced, a completely successful islet transplantation in humans has not been accomplished. Procurement of a sufficient quantity of islet tissue and prevention of allograft rejection are major problems, but solutions appear to be forthcoming from the laboratory. The ability of both whole pancreas and islet transplantation to prevent the development or halt the progression of secondary lesions in experimental diabetes provides an impetus to pursue such an approach in humans.
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  • 3
    ISSN: 1432-198X
    Keywords: Donor antigen-specific hyporeactivity ; Allogeneic microchimerism ; Kidney recipients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Our previous studies indicate donor antigenspecific hyporeactivity is a useful marker for identifying solid organ transplant recipients at low risk for immunological complications; the hyporeactive subgroup experiences a lower incidence of chronic rejection. One purpose of the current study was to determine whether hyporeactivity could be identified in pediatric kidney recipients and whether it correlated with improved graft outcome. Of 18 pediatric kidney recipients tested, 6 (33%) had developed donor antigen-specific hyporeactivity. All 18 experienced good graft outcome. Second, we determined whether donor antigen-specific hyporeactivity correlates with peripheral blood microchimerism and outcome in adult kidney recipients. Our previous studies of lung recipients demonstrated development of obliterative bronchiolitis in recipients with microchimerism who remain responsive, but not in recipients who had become hyporesponsive to donor antigen. Preliminary results in our current study of 23 adult kidney recipients indicate microchimerism for 6 (26%): 4 hyporesponsive and 2 responsive to donor antigen. Microchimerism was not detected for 17 recipients: 6 hyporesponsive and 11 responsive to donor antigen. One hyporesponsive/chimeric patient and 4 recipients negative for both parameters have been diagnosed with biopsy-proven chronic rejection. In summary, both hyporeactivity and chimerism are found at a higher frequency in lung than kidney recipients. Unlike lung recipients, not all hyporesponsive kidney recipients had peripheral blood chimerism. Additional numbers are needed to determine if microchimerism correlates with donor antigen-specific hyporeactivity or graft outcome.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-198X
    Keywords: Key words: Renal transplantation   ;   Graft rejection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Infants are thought to be more immunoreactive and at a greater risk for developing irreversible rejection compared with older children. We investigated this by analyzing patient and graft survival rates, incidence of acute rejection, reversibility of acute rejection, development of a subsequent acute rejection, and incidence of graft loss due to rejection in 154 children (〈18 years of age) after primary renal transplantation. Most patients (n = 139) were treated with quadruple immunosuppression (antibody, azathioprine, prednisone, cyclosporine). Treatment of the first acute rejection episode (ARE) consisted of antibody and increased prednisone (68%) or increased prednisone alone (30%), and was not significantly different between the age groups. Transplants were from living donors (LRD) in 80% of cases. Patients were followed for at least 1 year (mean 58±30 months); 68% (105/154) of recipients experienced 1 or more ARE. The incidence of ARE was significantly lower in patients 〈2 years of age (45%) compared with patients 2 – 5 (76%, P = 0.01), 6 – 12 (78%, P = 0.005), and 13 – 17 (76%, P = 0.009) years of age. There was no significant difference in the 1-, 2- and 5-year patient or graft survival rates, the development of a subsequent acute rejection, or the incidence of graft loss due to acute rejection when analyzed by age group. These data suggest that the impact of an ARE is similar for younger and older children in our population receiving predominantly LRD transplants and quadruple immunosuppression.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-198X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric nephrology 11 (1997), S. 399-403 
    ISSN: 1432-198X
    Keywords: Key words:  Renal transplantation ; Hospital readmissions ; Infections
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract.   We asked whether pediatric renal transplant recipients, subgrouped by age, differed in the percentage and number of hospital readmissions and in the incidence of infectious complications post transplant. Between 1 August 1985 and 31 October 1993, a total of 164 patients 〈18 years of age underwent primary transplants, with cyclosporine-based immunosuppression, at the University of Minnesota. The percentage of readmissions (P = NS), the mean number of readmissions (P = NS), and the length of hospital stay during readmission (P = NS) did not differ significantly among age groups. The overall incidence of acute rejection was greater in those ≥2 years than those 〈2 years (P = 0.002), and in living donor recipients ≥2 years versus those 〈2 years (P = 0.02). The incidence of bacterial infection (〈2 years, 87%; 2 – 5 years, 72%; 6 – 12 years, 51%; 13 – 17 years, 40%) was greater in younger recipients (P = 0.0001). The most common bacterial infection in recipients ≤5 years was Clostridium difficile-associated diarrhea; in those 〉5 years, urinary tract infection. The overall incidence of viral infection did not differ among groups (P = NS). The most common viral infection in recipients ≤5 years was varicella and those 〉5 years, cytomegalovirus infection. Risk factors for infection in the first 6 months post transplant included age 〈2 years and Solu-Medrol treatment for acute rejection. In conclusion, young recipients 〈2 years of age at the time of transplant are at a higher risk for bacterial infection post transplant.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-198X
    Keywords: Key words: Renal transplantation ; Acute rejection ; Chronic rejection ; Risk factors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Chronic rejection (CR) is the most common cause of graft loss beyond the 1st posttransplant year. The aim of this analysis was to identify the risk factors for the development of CR in pediatric renal transplant recipients. Between June 1984 and March 1994, 217 renal transplants were performed in children at our center. Immunosuppression included prednisone, azathioprine, cyclosporine (CsA), and prophylactic antibody. Using multivariate analysis, we studied the impact of the following variables on the development of biopsy-proven CR: age at transplant (≤5 years, 〉5 years), gender, race, transplant number (primary, retransplant), donor source (cadaver, living donor), donor age (〈20 years, 20 – 49 years, 〉49 years), number of ABDR mismatches (0, 1 – 2, 3 – 4, 5 – 6), number of DR mismatches (0, 1, 2), percentage peak panel reactive antibody (PRA) (≤50%, 〉50%), percentage PRA at transplantation (≤50%, 〉50%), dialysis pretransplant, preservation time 〉24 h, acute tubular necrosis requiring dialysis, initial CsA dosage (≤5 mg/kg per day, 〉5 mg/kg per day), CsA dosage at 1 year posttransplant (≤5 mg/kg per day, 〉5 mg/kg per day), acute rejection (AR), number of AR episodes (ARE) (1, 〉1), timing of AR (≤6 months, 〉6 months), reversibility of AR (complete, partial), and infection [cytomegalovirus (CMV), non-CMV viral, bacterial]. Risk factors for the development of CR in pediatric renal transplant recipients were: AR (P 〈0.0001, odds ratio 19.4), multiple ARE (〉1 vs. 1) (P 〈0.0001, odds ratio 30.1), and high percentage peak PRA (〉50%) (P 〈0.03, odds ratio 3.6).
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-198X
    Keywords: Allograft loss ; Causes ; Large single-center pediatric population
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract At our institution, 521 kidney transplants were performed in 429 children (mean age 8.7±5.6-years) between 1969 and 1991. Of these transplants, 408 were primary, 113 were retransplants, 347 were living related, 171 were cadaver, and 3 were living nonrelated. Immunosuppression consisted of prednisone, azathioprine, and Minnesota antilymphocyte globulin (non-CSA) in 339 patients, total lymphoid irradiation in 8, and, more recently, cyclosporine (CSA) in addition in 168 patients. Average followup was 8.8±6.0 years. Actuarial graft survival in the non-CSA versus CSA groups at 1 year was 77.0% versus 85.7%; at 5 years, 59.6% versus 71.9%. Of 136 non-CSA patients, causes of graft loss at 5 years included: chronic rejection in 55 (40.4%), acute rejection in 27 (19.9%), recurrent disease in 16 (11.8%), technical complications in 8 (5.9%), infectious complications in 4 (2.9%), other causes in 5 (3.7%), and death with a functioning graft in 21 (15.4%). Of 40 CSA patients, causes of graft loss at 5 years included: chronic rejection in 16 (40.0%), acute rejection in 8 (20.0%), recurrent disease in 6 (15.0%), technical complications in 3 (7.5%), other causes in 2 (5.0%), and death with a functioning graft in 5 (12.5%). The causes of graft loss did not significantly differ in the non-CSA and CSA groups. Chronic rejection was the most common cause of graft loss in both groups. Research focusing on chronic rejection is needed to improve graft outcome in pediatric kidney transplantation.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-2277
    Keywords: Kidney, liver transplantation ; Liver, kidney transplantation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Patients with end-stage renal and hepatic failure may be treated with combined liver and kidney transplantation (CLKTx). We reviewed the indications and outcomes of 16 CLKTx performed at the University of Minnesota between 1980 and 1994. The majority of the recipients (87.5%) were young patients affected by congenital hepatic anomalies and concomitant end-stage renal failure. Fourteen were treated with cyclosporin-based immunosuppression and had an excellent outcome: with an average of 6 years of follow-up, patient survival was 85.7%, liver graft survival 85.7%, and kidney graft survival 72%. The incidence of rejection episodes was similar to the rate of rejection in our solitary kidney and liver transplants. In conclusion, our experience supports the value of CLKTx in treating patients with simultaneous failure of both organs or with congenital enzymatic hepatic deficits leading to renal failure.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical medicine and bioethics 5 (1984), S. 155-166 
    ISSN: 1573-1200
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Philosophy
    Notes: Conclusions There remains a tremendous shortage of organs for transplantation, and many patients have prolonged waiting periods before receiving a transplant. This occurs in spite of data showing that (1) the general public supports transplantation and organ donation, and (2) a much larger number of donors is potentially available. Current legislation creates an environment that is awkward and often hostile to organ donation. As a result, many physicians do not refer potential donors and many families refuse consent. Presumed consent legislation would create a more favorable environment and has the potential of markedly increasing the number of potential donors whose organs could be used. Arguments against changing the law to ‘presumed consent’ have emphasized that other remedies would increase the number of donors. However, these remedies have been in effect for almost two decades without a marked increase in organ donation. We recommend reconsideration of legislative changes to enable ‘presumed consent’ to be in force.
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