Donation after circulatory death liver transplantation: What are the limits for an acceptable DCD graft?

The utilization of donation after circulatory death (DCD) livers has been growing over the last decade. In large-volume centers, survival outcomes have improved and are comparable to outcomes with brain death donor (DBD) liver transplantation (LT). The relatively concentrated success with DCD LT demonstrated by high-volume transplant centers has rekindled international enthusiasm. The combination of increasing expertise in DCD LT and ongoing shortage in transplantable organs has promoted expansion of the DCD donor pool with regards to donor age, body mass index and donor warm ischemia time. In this review, we focused on the practice patterns in DCD liver graft utilization in the last decade, along with the possibilities for further expansion of DCD liver graft utilization and new technologies, such as machine perfusion.

Israel's 2008 Organ Transplant Law: continued ethical challenges to the priority points model

In 2008, responding to a widening gap between need and availability of transplant organs, Israel's Ministry of Health adopted a program of incentivized cadaveric organ donation. The Organ Transplant Law rewards individuals with prioritized access to organs on the condition that they participate in procurement efforts. Priority is awarded in the form of additional points allocated to the individual's organ recipient profile. Although Israel has experienced moderate gains in the years since the law's implementation, these have not been sufficient to satisfy the demand. Furthermore, the law faces logistical and ethical challenges. These challenges could potentially be resolved by shifting the organ procurement default to routine retrieval rather than the current default of presumed refusal to organ retrieval.This paper examines philosophical and practical challenges to the priority points policy and weighs whether Israel should consider an alternative policy of routine retrieval of transplant organs with the option to opt out of the donor pool.

Development of a Successful Non—Heart-Beating Organ Donation Program

To help alleviate the organ shortage, transplant centers are using organs from expanded-criteria donors, who were considered unsuitable just a few years ago, such as Non—Heart-beating donors. In 1998, we made a concerted effort to increase the number of Non—Heart-beating donors recovered by our organ procurement organization. In this paper, we discuss the steps in establishing this program, including transplant center support, estimating the number of potential Non—Heart-beating donors, organ procurement support, protocol development, hospital development, education, putting the protocol into practice, follow-up, and effect of the program on organ procurement. With the establishment of this program, the number of Non—Heart-beating donors increased from 2% to 5% per year to over 10% for the past 2 years. From these donors, 61 of 82 recovered kidneys were transplanted into 58 patients, and 18 of 20 recovered livers were transplanted. A Non—Heart-beating donor program can significantly add to the number of organ transplants and successful transplantations.

Estimating Waiting Time for Deceased Donor Renal Transplantion in the Era of New Kidney Allocation System

BACKGROUND

On December 4, 2014, a new deceased donor kidney allocation system (KAS) was implemented. The KAS was designed to improve organ equity and graft-recipient longevity matching. However, estimated wait-time to deceased donor transplantation is difficult to predict post-KAS.

METHODS

Using the Kidney-Pancreas Simulated Allocation Model software (KPSAM), a program that the Organ Procurement and Transplant Network uses to assess policy proposals, we compared the kidney allocations of both the new (post-KAS) and old policies (pre-KAS) (10 iterations for each group; total N = 204,148) and estimated wait-time based on blood type, duration of dialysis exposure, and calculated panel-reactive antibody (CPRA).

RESULTS

The simulations revealed that estimated median (25(th) and 75(th) percentile) waiting time in transplanted recipients decreased from 2.3 (1.2, 3.8) years in the old allocation to 1.8 (0.8, 3.4) years in the new allocation system. The rate of transplantations performed within the first year of wait-listing increased from 20.7% to 31.3%. The KPSAM resulted in more transplantations in recipients with more than 5 years of dialysis exposure (26.5% to 37.4%), longevity matching (12.2% to 17.5%), blood group B (12.6% to 17.2%), and high CPRA ≥98% (1.9% to 4.3%) in post-KAS compared with pre-KAS simulations.

CONCLUSIONS

Based on the KPSAM results, it was projected that post-KAS wait-time in transplanted recipients might decrease approximately 6 months (22%) across all CPRA categories. It might be related to the KAS awarding waiting time points for prelisting dialysis time and priority points awarded based on CPRA (bolus effect).

[Deceased organ donors, legal regulations governing diagnosis of brain death, overview of donors and liver transplants in the Czech Republic]

The key restriction of transplantation medicine globally, as well as in the Czech Republic, concerns the lack of organs. The number of deceased donors, and thus the availability of organ transplants, has been stagnating in our country. The paper describes current legal regulations governing the dia-gnosis of brain death and primary legal and medical criteria for the contraindication of the deceased for organ explantation, gives an overview of the number of liver transplants, age structure, and diagnosis resulting in brain death of the deceased liver donors in the Czech Republic.

The use of back-up units to enhance the safety of unrelated donor cord blood transplantation

The inability to obtain additional stem cells is a disadvantage of unrelated donor cord blood transplantation (CBT). Moreover, in the event of problems with unit shipment, compromised unit quality, thaw mishaps, or graft failure, the time to secure a back-up graft could be unacceptable. Emergent shipment of 1 to 2 back-up units that have been previously typed and reserved could overcome this limitation. However, the advantages of this approach are not established. Therefore, we present our use of back-up units over a 5.5-year period. Six of 121 CBT recipients (5%) required back-up unit infusion. Indications included shipment mishaps (n = 2), poor unit viability (n = 2), significant infusion reaction (n = 1), and graft failure (n = 1). Lack of back-up units would have caused transplantation delay or infusion of inferior-quality units. Five of the 6 patients achieved sustained donor engraftment. We demonstrate that back-up units are emergently required in a significant minority of patients, supporting the incorporation of at least 1 back-up unit in cord blood (CB) selection algorithms to enhance CBT safety.

Insurance status of U.S. organ donors and transplant recipients: the uninsured give, but rarely receive

Organ transplantation is an expensive, life-saving technology. Previous studies have found that few transplant recipients in the United States lack health insurance (in part because patients may become eligible for special coverage because of their disability and transplant teams vigorously advocate for their patients). Few data are available on the insurance status of U.S. organ donors. The authors analyzed the 2003 National Inpatient Sample (NIS), a nationally representative 20 percent sample of U.S. hospital stays, and identified incident organ donors and recipients using ICD-9-CM diagnosis and procedure codes. The NIS sample included 1,447 organ donors and 4,962 transplant recipients, equivalent after weighting to 6,517 donors and 23,656 recipients nationwide; 16.9 percent of organ donors but only 0.8 percent of transplant recipients were uninsured. In multivariate analysis, compared with other inpatients organ donors were much more likely to be uninsured (OR 3.41, 95% CI 2.81-4.15), whereas transplant recipients were less likely to lack coverage (OR 0.08, 95% CI 0.06-0.12). Many uninsured Americans donate organs, but they rarely receive them.

Survival lotteries reconsidered

In 1975 John Harris envisaged a survival lottery to redistribute organs from one to a greater number in order to reduce number of deaths as a consequence of organ failure. In this paper I reach a conclusion about when running a survival lottery is permissible by looking at the reason prospective participants have for allowing the procedure from a contractual perspective. I identify three versions of the survival lottery. In a National Lottery, everyone within a jurisdiction is a candidate for being a donor for everyone else, disregarding all differences between individuals' eventual possibility of needing an organ. In a Group Specific Lottery, it is a question of running a lottery among members of a specific group who share the same probability of getting organ failure. In a Local Lottery one randomises among individuals who are already in need of a new organ but who happen to be compatible and in need of different organs. While the first is vulnerable to considerations of fairness, it is difficult to perceive a feasible way to implement the second option that does not come with a host of unwelcome consequences. I argue, however, that it is permissible to run Local Lotteries.

The Use of Marginal Heart Beating Donor Livers for Transplantation in the United Kingdom

BACKGROUND

This study investigated the use of deceased heart-beating donor livers offered for transplantation during a 10-year period, during which there has been an increasing disparity between organ supply and demand in the United Kingdom.

METHODS

Summary data from the National Transplant Database were analyzed on all 7107 heart-beating cadaveric donor livers offered for transplantation in the United Kingdom between 1996 and 2006, with particular attention to livers that were not retrieved, not transplanted, or that subsequently failed to function after transplantation.

RESULTS

The difference between the number of patients registered for liver transplantation in the United Kingdom and those transplanted increased from 132 in 1996 to 333 in 2006, leading to a 77% increase in the number of waiting list deaths. Mean donor age increased by 6.1 (5.7-6.6) years during the period studied, in part because of a reduction in the proportion of donors arising from road fatalities. Despite this, the rate of primary nonfunction remained low (1.7% during 1996-2006). The absolute risk increase of primary nonfunction arising from receipt of a moderately as opposed to mildly steatotic organ was 2.6%, which translates to a "number needed to harm" of 41 patients.

CONCLUSIONS

The decline in both the number and the quality of livers offered for transplantation in the United Kingdom during the past 10 years has not been associated with a change in the rate of primary nonfunction. In these times of acute donor shortage, these data may justify a more liberal use of marginal grafts.

Using thyroid hormone in brain-dead donors to maximize the number of organs available for transplantation

The aggressive management of brain-dead (cadaveric) organ donors has been shown to increase organs available for transplantation. Some centers use hormone therapy with thyroid hormone (T(4)) in selected donors. The purpose of this study is to evaluate the effects of T(4) on organs available for transplantation. A policy of aggressive donor management was adopted at our trauma center in 1998. T(4) therapy is reserved for the hemodynamically unstable donors who require significant vasopressor support. The records of patients who successfully donated organs between January 2001 and December 2005 were reviewed. Organ donor demographics and whether T(4) was used was examined for each donor. T(4) was used in 96 of 123 donors (78%). Compared with donors who did not receive T(4), those that did were similar in age (32 +/- 14 vs. 38 +/- 21, p = 0.148), had more organs donated (3.9 +/- 1.7 vs. 3.2 +/- 1.7, p = 0.048), and had no differences in brain-death related complications. Despite the severe hemodynamic instability in the T(4) group, the number of organs harvested from this group was significantly more than in patients who did not receive T(4). The use of T(4) in this group may result in the increased salvage of transplantable organs.

Issues unique to pediatric liver transplantation

Liver transplantation in pediatrics has become an accepted modality of treatment in end-stage liver disease and irreversible acute liver failure. Biliary atresia is the most common indication requiring liver transplantation in children. The diagnosis and causes of acute liver failure in children differ from those in adults. Growth and development require special consideration in children. Regular surveillance of Epstein-Barr virus by polymerase chain reaction and appropriate therapy may reduce the incidence of post-transplant lymphoproliferative disease after transplantation. Adherence to the prescribed medical regimen is essential for good graft function. A multidisciplinary approach is the key to success in liver transplantation in children.

The value of MELD and sodium in assessing potential liver transplant recipients in the United Kingdom

As the result of the widening gap between supply and demand of organs for liver transplantation, efforts to improve allocation have become an increasingly important yet controversial subject. The MELD score has been adopted in the USA but its usefulness has rarely been examined in Europe. We carried out an intention to treat analysis of 422 patients placed on our transplant waiting list over a 5-year period. We examined multiple variables to investigate the value of MELD, sodium and other factors in predicting post-transplant outcomes. MELD at transplant was the most important indicator of post-transplant outcomes. In addition, delta-MELD and hyponatreamia were significant at predicting, which patients placed on the waiting list would not proceed to transplant. While a move to allocating solely by MELD is not justified in the UK allocation system, there is value in using MELD, delta-MELD and hyponatreamia in making decisions regarding the allocation of organs. This may subsequently help to improve overall outcomes.

Overcoming the shortage of transplantable organs: ethical and psychological aspects

The main ethical problem of organ transplantation is the shortage of transplantable organs. The substitute strategies currently under discussion endanger frust in transplantion medicine and thereby increase the problem. Thus ethically preferable alternatives to overcome the shortage are suggested.

Overcoming the shortage of transplantable organs: ethical and psychological aspects

The main ethical problem of organ transplantation is the shortage of transplantable organs. The substitute strategies currently under discussion endanger frust in transplantion medicine and thereby increase the problem. Thus ethically preferable alternatives to overcome the shortage are suggested.

Allocation of Deceased Donor Kidneys for Transplantation: Opinions of Patients With CKD

BACKGROUND

Deceased donor kidney allocation schemes are designed to balance optimal utility with equity of access. The aim of this single-center survey is to seek patient opinion about the relative importance of factors used to determine the optimal transplant recipient in kidney allocation schemes.

METHODS

In each of 8 scenarios, participants were invited to select which 1 of 2 hypothetical patients should receive a kidney.

RESULTS

Two hundred thirty-two of 295 invited patients (78.6%) completed the questionnaire: 104 of 153 invited hemodialysis patients (68.0%) and 128 of 142 invited patients with functioning transplants (90.1%). Only 6.0% of participants agreed with current UK Transplant (UKT) and United Network for Organ Sharing (UNOS) allocation to a patient not yet on dialysis therapy who had been on the transplant waiting list longer than a patient already on dialysis therapy. Only 24.6% of participants agreed with the UKT and UNOS schemes that the transplant survival advantage associated with HLA matching warranted allocation of a kidney to a patient who had been waiting 2 years in preference to a patient waiting 7 years. Participants also were opposed to the use of recipient age and balance of exchange agreements (that reward centers with high rates of organ retrieval). The majority agreed with UKT and UNOS that recipient sex should not be used to allocate kidneys and allocation should favor recipients who have waited longer.

CONCLUSION

Patients disagreed with several aspects of current allocation systems. Analysis of patient opinion should be taken into consideration when attempting to optimize the use of this scarce health resource.

Disaster preparedness and triage: justice and the common good

"Triage" is a term generally referring to the social practice of sorting or categorizing. While it originally had an innocent, commercial meaning referring to sorting crops according to quality, the term quickly took on a more ominous meaning referring to classifying battlefield casualties into three groups: those too well-off to be treated and then, among those more seriously wounded, one group that will get medical attention and another that will not. The moral problem is how to distinguish between the latter two groups. The Hippocratic oath has been utterly useless in helping us do this sorting, since the oath commands the clinician to remain loyal to the individual patient and give no attention to the choice between two patients with different needs. Baker and Strosberg show that historically the British sorted following utilitarian principles, giving priority to the patients who could benefit the most even if they were not in greatest need, while the French arranged patients who could be helped in order of greatest need even if it was not maximally efficient to do so. Understanding how contemporary organ transplant policy utilizes triage can help us clarify our mass disaster triage policy. Two organ transplant examples--tissue typing for kidneys and geographical priority for allocating livers--show that American social policy, when forced to choose between allocating on the basis of efficiency or allocating on the basis of justice, will consider both principles, but give equal or dominant priority to justice--even though this priority is understood to be relatively inefficient. Since health care professionals have a recognized preference for efficiency over justice and lay people are inclined towards justice, leaving mass disaster triage policy in the hands of health professionals will predictably structure the policy in a way that conflicts with the moral priorities of the lay population. Formal public debate that recognizes the conflict between efficiency and equity--professional and lay priorities--is therefore essential.

Organ transplantation—how much of the promise has been realized?

Since the introduction of organ transplantation into medical practice, progress and optimism have been abundant. Improvements in immunosuppressive drugs and ancillary care have led to outstanding short-term (1--3-year) patient and graft survival rates. This success is mitigated by several problems, including poor long-term (>5-year) graft survival rates, the need for continual immunosuppressive medication and the discrepancy between the demand for organs and the supply. Developing methods to induce transplant tolerance, as a means to improve graft outcomes and eliminate the requirement for immunosuppression, and expanding the pool of organs for transplantation are the major challenges of the field.

Organ Scarcity and the Psychological Pre—Heart Transplant Evaluation: A Simulation Study Using Community Residents

Context

Although research examining medical outcomes in heart transplantation has progressed, there are few studies examining the impact of organ scarcity and wait list demand on the transplant candidate evaluation process.

Objective

To examine the influence of transplant knowledge pertaining to organ scarcity and wait list demand on simulated ratings of psychological distress provided by community residents participating in a simulated pre–heart transplant evaluation.

Design

A randomized, controlled design. We used a vignette simulation to experimentally manipulate the effect of transplant knowledge pertaining to organ scarcity in a group of community residents with no previous knowledge or experience with the transplant selection process.

Participants

One hundred forty-three community residents visiting a department of motor vehicles office in north central Florida were recruited. Community residents were randomly assigned to 1 of 2 experimental conditions, with either mention (n = 66) or no mention (n = 77) of organ scarcity and wait list demand statistics in their assigned vignette. Participants then served as actors and completed measures of psychological distress as part of a mock psychological pre–heart transplant evaluation. Results Participants with mention of organ scarcity reported significantly fewer symptoms of anxiety and depression compared to those with no mention of organ scarcity. This relationship remained significant even after controlling for relevant covariates, including age and simulated ratings of social desirability.

Conclusion

Transplant knowledge pertaining to organ scarcity and wait list demand may influence transplant candidates to report fewer symptoms of psychological distress. Clinical suggestions for dealing with underreporting of psychological distress are discussed.

Stem cell-based approaches to solving the problem of tissue supply for islet transplantation in type 1 diabetes

Type 1 diabetes is a debilitating condition, affecting millions worldwide, that is characterized by the autoimmune destruction of insulin-producing pancreatic islets of Langerhans. Although exogenous insulin administration has traditionally been the mode of treatment for this disease, recent advancements in the transplantation of donor-derived insulin-producing cells have provided new hope for a cure. However, in order for islet transplantation to become a widely used technique, an alternative source of cells must be identified to supplement the limited supply currently available from cadaveric donor organs. Stem cells represent a promising solution to this problem, and current research is being aimed at the creation of islet-endocrine tissue from these undifferentiated cells. This review presents a summary of the research to date involving stem cells and cell replacement therapy for type 1 diabetes. The potential for the differentiation of embryonic stem (ES) cells to islet phenotype is discussed, as well as the possibility of identifying and exploiting a pancreatic progenitor/stem cell from the adult pancreas. The possibility of creating new islets from adult stem cells derived from other tissues, or directly form other terminally differentiated cell types is also addressed. Finally, a model for the isolation and maturation of islets from the neonatal porcine pancreas is discussed as evidence for the existence of an islet precursor cell in the pancreas.

Use of elderly donors (> 60 years) for liver transplantation

BACKGROUND

As the demand for liver transplantation has become greater than the availability of donor livers, the criteria for donor selection or rejection are more important than ever before. In view of an increasing number of patients on the waiting list, some centres are expanding their donor pool by relaxing the criteria, such as by using organs from elderly (> 60 years) brainstem-dead donors. In this study, we reviewed our experience of using elderly brain-dead donor livers, investigating the potential prognostic factors of the donor, and analysing the influence of donor age on early graft function and graft survival.

METHODS

We retrospectively evaluated 106 cadaveric donor liver transplantations in 98 patients. Seven patients (6.6%, 7 vs 106) received livers from donors older than 60 years. Pre-transplantation characteristics of donors and the outcome of recipients were evaluated. Donor prognostic factors were analysed using Cox univariate analysis and confirmed by a multivariate forward stepwise Cox model. Early graft function was compared between recipients of grafts from donors older and younger than 60 years.

RESULTS

There were no primary non-functions or re-transplants in the group receiving elderly grafts. Early graft function was similar in patients with grafts from elderly and younger donors. Univariate analysis demonstrated that prognostic factors had no relationship with long-term recipient survival. The 3-month and 1-year cumulative graft survival rates were 100% and 82% in the elderly graft group and 84% and 83% in the younger graft group, respectively. Kaplan-Meier curves and the log-rank test indicated that there was no difference in graft and patient survival rates between the two groups.

CONCLUSIONS

Old age is not a contraindication for liver donation. Liver grafts from donors older than 60 years can be used safely.

[Living donors in organ transplantation--the solution for the organ shortage]

Die Schere zwischen der Anzahl Patienten, die auf eine Organtransplantation warten, und der Anzahl gespendeter Organen geht immer weiter auf. Ursächlich sind rückläufige Spenderzahlen und breiter gestellte Indikationen für eine Organtransplantation. Eine sehr gute Lösung stellt die Lebendspende, vor allem bei der Nierentransplantation, dar, sofern ein geeigneter Spender zur Verfügung steht. Die Resultate der Lebendspende sind im Vergleich zur Leichennierentransplantation deutlich besser. Somit stellt die Lebendspendetransplantation einen wesentlichen Faktor zur Bekämpfung des Organspendermangels dar, ist jedoch nicht in der Lage, diesen alleine vollständig auszugleichen. Zusätzliche Massnahmen im Bereiche der Information und Kommunikation und möglicherweise auch im juristischen Bereich sind weiter erforderlich.

How well do members of the public deal with a distributive justice problem in health care?

OBJECTIVES

There is some debate about the appropriateness of involving the general public in decisions concerning the prioritising and rationing of health care resources. Doubt has been expressed about the public's ability to deal with these issues in a fair and rational way without taking refuge in ready-made official ideologies. This study considers the quality of discussion achieved by members of the public on this issue in terms of their ability to recognise the validity of conflicting arguments, to cope with the shifting positions created by these conflicts, and to avoid opting for simplistic ready-made solutions. It also records the participants' own perceptions of the quality of their discussion.

METHODS

Four focus groups were recruited through community organisations in a suburban area of Derby, and were asked to evaluate criteria for the rationing of donor livers for transplantation, relating this to specific patient profiles. Discussions were recorded, transcribed and analysed using qualitative methods.

RESULTS

Three groups showed an ability to work with shifting and conflicting arguments on most issues they discussed, but two of these groups showed a tendency to adopt simplistic solutions on one specific issue. The fourth group adopted a clear-cut solution to the main issues early on, and adhered to it for the rest of the discussion.

CONCLUSION

The overall performance of the groups suggests that rational and open public discussion can be achieved, but that participants may need support in avoiding premature adoption of simplistic solutions.

MELD scores of liver transplant recipients according to size of waiting list: impact of organ allocation and patient outcomes

CONTEXT

The Model for Endstage Liver Disease (MELD) score serves as the basis for the distribution of deceased-donor (DD) livers and was developed in response to "the final rule" mandate, whose stated principle is to allocate livers according to a patient's medical need, with less emphasis on keeping organs in the local procurement area. However, in selected areas of the United States, organs are kept in organ procurement organizations (OPOs) with small waiting lists and transplanted into less-sick patients instead of being allocated to sicker patients in nearby transplant centers in OPOs with large waiting lists.

OBJECTIVE

To determine whether there is a difference in MELD scores for liver transplant recipients receiving transplants in small vs large OPOs.

DESIGN AND SETTING

Retrospective review of the US Scientific Registry of Transplant Recipients between February 28, 2002, and March 31, 2003. Transplant recipients (N = 4798) had end-stage liver disease and received DD livers.

MAIN OUTCOME MEASURES

MELD score distribution (range, 6-40), graft survival, and patient survival for liver transplant recipients in small (<100) and large (> or =100 on the waiting list) OPOs.

RESULTS

The distribution of MELD scores was the same in large and small OPOs; 92% had a MELD score of 18 or less, 7% had a MELD score between 19 and 24, and only 2% of listed patients had a MELD score higher than 24 (P =.85). The proportion of patients receiving transplants in small OPOs and with a MELD score higher than 24 was significantly lower than that in large OPOs (19% vs 49%; P<.001). Patient survival rates at 1 year after transplantation for small OPOs (86.4%) and large OPOs (86.6%) were not statistically different (P =.59), and neither were graft survival rates in small OPOs (80.1%) and large OPOs (81.3%) (P =.80).

CONCLUSIONS

There is a significant disparity in MELD scores in liver transplant recipients in small vs large OPOs; fewer transplant recipients in small OPOs have severe liver disease (MELD score >24). This disparity does not reflect the stated goals of the current allocation policy, which is to distribute livers according to a patient's medical need, with less emphasis on keeping organs in the local procurement area.

A note on a discussion group study of public preferences regarding priorities in the allocation of donor kidneys

OBJECTIVE

To explore whether and how people wish to give differential priority based on certain characteristics of the potential recipient of a donor kidney.

DESIGN

A random sample of people resident in York was invited to attend two focus group meetings each, a fortnight apart.

SETTING

The City of York.

PARTICIPANTS

Twenty-three randomly chosen people meeting in four groups of five or six.

MAIN OUTCOME MEASURES

Those factors that people think should be taken into account when allocating donor kidneys, in addition to the expected benefits from transplantation.

RESULTS

People are willing and able to distinguish between potential recipients of a kidney transplantation according to a range of characteristics beyond the expected benefits from treatment. There is a clear consensus across the four groups that one of the most important considerations is what will happen to the patient without treatment, and so priority is given to those with a poor prognosis. There is also a strong view that priority should be given to younger patients and to those with dependants. The time spent waiting for a transplant is also important, but less so.

CONCLUSIONS

A sample of the general public, after discussion and debate, wish to take account of a number of patient characteristics when allocating donor kidneys. There is some degree of consensus about what these factors should be and this suggests that it might be possible to develop a set of guidelines for the allocation of donor kidneys.

Identifying the potential organ donor: an audit of hospital deaths

OBJECTIVE

To quantify the potential for organ donation in Victoria and identify missed opportunities for organ donation.

DESIGN AND SETTING

Prospective medical record audit of all deaths in 12 Victorian hospitals.

MEASUREMENTS

Data on deaths, total potential donors, organ donors and outcome of requests for organ donation were collected. Patients in whom brain death was confirmed or likely to occur and in whom organ donation was not requested (unrealised potential donors) were classified by an independent panel. Rates of organ donation and unrealised donors were determined as a proportion of total potential donors and hospital deaths and the maximal potential organ donor rate was estimated.

RESULTS

Of 5551 deaths, there were 112 potential donors, with 66 requests for organ donation resulting in 39 consents (consent rate of 59%) and 37 organ donors (33% of total potential donors; 0.7% of hospital deaths). Two consented potential donors did not donate due to failed physiological support (5%). There were 46 medically suitable unrealised potential donors; 3 with confirmed brain death. Approximately half of these patients had treatment withdrawn in the intensive care unit and half in the Emergency Department. The estimated maximal potential donor rate was 30 per million population.

CONCLUSIONS

The potential for organ donation in Victoria is relatively low compared with previous estimates in Australia and overseas. An increase in the organ donation rate may be possible through increasing consent and the identification and support of potential donors. This would require substantial changes in clinical practice that have resource and ethical implications.

Professional and public attitudes toward incentives for organ donation

The U.S. faces a widening gap between the need for, and the supply of, transplantable organs. The waiting list for transplants increased 150% in the past decade; last year, about 6,000 people died awaiting a transplant. This need has rekindled debate about the morality and feasibility of using incentives to encourage posthumous organ donation. This Issue Brief explores attitudes of the public and health professionals in the transplant community about using financial and nonfinancial incentives to increase the supply of cadaver organs for transplant.

Transplantation ethics: old questions, new answers?

The first reported successful kidney transplantation occurred in 1954, between twins. Since then, organ donation and transplantation has become less a medical marvel than a common expectation of patients with a variety of diseases resulting in organ failure. Those expectations have caused demand for organs to skyrocket far beyond available supply, fueling an organ shortage and resulting in over 60,000 patients on transplant waiting lists. In this special issue, our contributors attempt to shed new light on some of the many old ethical questions raised by transplant in the contemporary context of extreme scarcity.

Organ allocation: model for end-stage liver disease, Child-Turcotte-Pugh, Mayo risk score, or something else

The discovery of a single test of liver function has been a goal of hepatologists for many years. The great complexity of the liver and its many diverse functions, however, has prevented such an accomplishment. An analogy can be made with the way one currently uses liver tests where several individual tests are combined into a profile. This article presents evidence that confirms the same concept: Only by combining several clinical and laboratory measures can we predict the prognosis of liver disease patients. End-stage liver disease and pediatric end-stage liver disease models are valuable additions to the prognostic armamentarium; however, these models are not perfect and some important indications for liver transplant today cannot be included because their main issue is not disease severity.

Liver organ allocation for hepatocellular carcinoma: are we sure?

Of patients with hepatocellular carcinoma (HCC), 70% to 90% present with cirrhosis. Accordingly, liver transplantation (LT), not liver resection, currently remains the only possibility of cure for these patients. Because there is a severe shortage of liver organ donors, not all patients in need can be offered LT. Therefore, transplant listing criteria simultaneously must determine the greatest number of suitable candidates for transplantation while rejecting the smallest number of those who could benefit from LT. The objective of this study was to determine the outcome of patients with HCC who are denied LT by current listing criteria. Of patients who are being denied liver transplantation by the current United Network for Organ Sharing listing criteria (but who were transplanted before the current guidelines took effect), 27% to 49% were cured by this procedure. The listing criteria for LT in the presence of HCC should reflect the minimum acceptable (not maximum acceptable) recurrence-free survival rate and must reflect a consensus of the transplant community.

A follow-up analysis of the pattern and predictors of dropout from the waiting list for liver transplantation in patients with hepatocellular carcinoma: implications for the current organ allocation policy

Since our interim report of the intention-to-treat outcome of orthotopic liver transplantation (OLT) for hepatocellular carcinoma (HCC), we have performed a follow-up analysis of an expanded cohort of 70 patients to further assess whether the observed pattern and predictors of dropout are consistent with the rationale behind current HCC-adjusted Model for End Stage Liver Disease (MELD) organ allocation scheme. All except one patient had pretransplantation staging meeting our proposed expanded criteria-a single lesion < or =6.5 cm, or three or fewer lesions none >4.5 cm and total tumor diameter < or =8 cm. Thirty-eight patients received OLT. The cumulative probabilities of dropout at 6, 12, and 18 months were 7.2%, 37.8%, and 55.1%, respectively. The respective dropout probabilities would have been 11.0%, 57.4%, and 68.7% if the United Network for Organ Sharing (UNOS) criteria for exclusion (single lesion < or =5 cm or three or fewer lesions none >3 cm) were applied. Predictors of dropout with either criteria included three tumor nodules and a single lesion >3 cm at initial presentation, whereas preoperative chemoembolization or ablation therapies were associated with a lower risk for dropout only when applying the UNOS criteria for patient exclusion. In the subgroup with two or three lesions or a solitary tumor >3 cm, the cumulative probabilities of dropout were nine-fold higher than those with a single lesion < or =3 cm (P =.004). In conclusion, the low dropout rate in the first 6 months and the differing dropout risks based on tumor characteristics support further refinements in the HCC-adjusted MELD organ allocation scheme.

Dual kidneys from marginal adult donors as a source for cadaveric renal transplantation in the United States

The current organ shortage has led to the utilization of double kidney transplants from marginal adult donors, but outcomes data are limited. The United Network for Organ Sharing registry database was used to compare the outcomes of 403 dual adult kidney transplantations (DKT) and 11,033 single kidney transplantations (SKT) from 1997 to 2000. Graft and patient survival and the effect of multiple risk factors were evaluated. It was found that DKT patients were older, less sensitized, and received grafts from older, more mismatched donors with longer cold ischemia times. There was also a greater percentage of donors with a history of diabetes or hypertension and African-American recipients and donors in the DKT group. Graft survival was inferior in the DKT group, with a 7% lower graft survival rate at 1 yr. There was a higher incidence of primary nonfunction in the DKT group, although the incidence of delayed graft function, early rejection treatment, and graft thrombosis did not differ. Multivariate analysis was used to identify African-American recipient ethnicity and retransplant as risk factors for graft loss. Graft survival was comparable in DKT and SKT with donors over 55 yr of age. DKT resulted in inferior graft outcomes compared with SKT. When compared with SKT with donors over 55 yr of age, DKT resulted in similar graft outcomes. These otherwise discarded kidneys should be cautiously considered as a source of marginal donors.