Increasing the Number of Organ Transplants in the United States by Optimizing Donor Authorization Rates

Survival Outcomes of Lung Transplant Recipients From Donors With Abnormal Kidney Function

BACKGROUND

Recovering lungs with pulmonary edema due to abnormal kidney function is considered one of the expanded selection criteria for lung transplant. The aim of this study is to assess lung transplant recipients' survival from donors with abnormal kidney function and to determine differences in lung recovery rates from donors with and donors without abnormal kidney function.

METHODS

We reviewed the United Network for Organ Sharing registry for first-time adult lung transplant donors and recipients from June 2005 to March 2017. Donor kidney function was categorized into three groups based on estimated glomerular filtration rate: group I, greater than 60 mL/min; group II, 15 to 59 mL/min; and group III, less than 15 mL/min. Recipient survival was stratified based on estimated glomerular filtration rate using Kaplan-Meier. A multivariate Cox Regression model with known risk factors that affect survival was used to compare survival among groups. Comparison of lung recovery among the three groups was also performed.

RESULTS

Lung recovery rates were 29.7% (15,670 of 52,747), 19.4% (3879 of 20,040), and 18.1% (704 of 3898) for groups I, II, and III, respectively. The 1-, 3-, and 5-year recipient survival rates were 86.2%, 69.2%, and 55.7% for group I; 84.9%, 66.9%, and 53.8% for group II; and 85.5%, 65.3%, and 50.3% for group III, respectively (adjusted P = .25; multivariate Cox regression method). When group I was used as reference, the adjusted hazard ratio for group II was 1.04 (95% CI, 0.98-1.10) and for group III, it was 1.08 (95% CI, 0.96-1.23), after adjusting with the multivariate Cox regression model.

CONCLUSIONS

There was no significant difference in lung recipient survival. The lung recovery rate from donors with abnormal kidney function was lower compared with that of donors with normal kidney function.

Maximizing the use of potential donors through increased rates of family approach for authorization

In the United States, a small proportion of potential deceased organ donor referrals lead to donation and recovery. Understanding variation in the processes involved between organ procurement organizations (OPOs) may help increase deceased donation and reduce the organ shortage. We studied 103 923 referrals from 10 OPOs from 2018 to 2019, of which 14.4% led to approach for authorization, 8.2% led to authorization, 5.1% led to organ recovery, and 4.8% led to transplantation. First-person authorization (FPA) was associated with threefold higher odds of donation (OR = _2.83 3.02 _3.22 , p < .001). Female referrals had 11% lower odds of approach; when approached, Black and Hispanic referrals had 46% and 35% lower odds of authorization, respectively (all p < .001). There was substantial OPO-level variation in rates of approach, authorization, and organ recovery, which persisted after adjusting for age, sex, race, and FPA status. An OPO's relative rate of approach correlated strongly with its relative rate of donation among all referrals (ρ = 0.43). Correlation between an individual OPO's authorization rate among approached families, and overall rate of donation, was negative, suggesting that high authorization rates may be the result of selective approach practices. Therefore, approaching a higher proportion of families for authorization may lead to higher donation rates.

Development and Characterization of a Nonelectronic Versatile Oxygenating Perfusion System for Tissue Preservation

Oxygenated machine perfusion of human organs has been shown to improve both preservation quality and time duration when compared to the current gold standard: static cold storage. However, existing machine perfusion devices designed for preservation and transportation of transplantable organs are too complicated and organ-specific to merit use as a solution for all organs. This work presents a novel, portable, and nonelectronic device potentially capable of delivering oxygenated machine perfusion to a variety of organs. An innovative pneumatic circuit system regulates a compressed oxygen source that cyclically inflates and deflates silicone tubes, which function as both the oxygenator and perfusion pump. Different combinations of silicone tubes in single or parallel configurations, with lengths ranging from 1.5 to 15.2 m, were evaluated at varying oxygen pressures from 27.6 to 110.3 kPa. The silicone tubes in parallel configurations produced higher peak perfusion pressures (70% increase), mean flow rates (102% increase), and oxygenation rates (268% increase) than the single silicone tubes that had equivalent total lengths. While pumping against a vascular resistance element that mimicked a kidney, the device achieved perfusion pressures (8.4-131.6 mmHg), flow rates (2.0-40.2 mL min^-1), and oxygenation rates (up to 388 μmol min^-1) that are consistent with values used in previous kidney preservation studies. The nonelectronic device achieved those perfusion parameters using 4.4 L min^-1 of oxygen to operate. These results demonstrate that oxygenated machine perfusion can be successfully achieved without any electronic components.

Heterogeneous Circles for Liver Allocation

BACKGROUND AND AIMS

In February 2020, the Organ Procurement and Transplantation Network replaced donor service area-based allocation of livers with acuity circles, a system based on three homogeneous circles around each donor hospital. This system has been criticized for neglecting to consider varying population density and proximity to coast and national borders.

APPROACH AND RESULTS

Using Scientific Registry of Transplant Recipients data from July 2013 to June 2017, we designed heterogeneous circles to reduce both circle size and variation in liver supply/demand ratios across transplant centers. We weighted liver demand by Model for End-Stage Liver Disease (MELD)/Pediatric End-Stage Liver Disease (PELD) because higher MELD/PELD candidates are more likely to be transplanted. Transplant centers in the West had the largest circles; transplant centers in the Midwest and South had the smallest circles. Supply/demand ratios ranged from 0.471 to 0.655 livers per MELD-weighted incident candidate. Our heterogeneous circles had lower variation in supply/demand ratios than homogeneous circles of any radius between 150 and 1,000 nautical miles (nm). Homogeneous circles of 500 nm, the largest circle used in the acuity circles allocation system, had a variance in supply/demand ratios 16 times higher than our heterogeneous circles (0.0156 vs. 0.0009) and a range of supply/demand ratios 2.3 times higher than our heterogeneous circles (0.421 vs. 0.184). Our heterogeneous circles had a median (interquartile range) radius of only 326 (275-470) nm but reduced disparities in supply/demand ratios significantly by accounting for population density, national borders, and geographic variation of supply and demand.

CONCLUSIONS

Large homogeneous circles create logistical burdens on transplant centers that do not need them, whereas small homogeneous circles increase geographic disparity. Using carefully designed heterogeneous circles can reduce geographic disparity in liver supply/demand ratios compared with homogeneous circles of radius ranging from 150 to 1,000 nm.

Allocating kidneys in optimized heterogeneous circles

Recently, the Organ Procurement and Transplant Network approved a plan to allocate kidneys within 250-nm circles around donor hospitals. These homogeneous circles might not substantially reduce geographic differences in transplant rates because deceased donor kidney supply and demand differ across the country. Using Scientific Registry of Transplant Recipients data from 2016-2019, we used an integer program to design unique, heterogeneous circles with sizes between 100 and 500 nm that reduced supply/demand ratio variation across transplant centers. We weighted demand according to wait time because candidates who have waited longer have higher priority. We compared supply/demand ratios and average travel distance of kidneys, using heterogeneous circles and 250 and 500-nm fixed-distance homogeneous circles. We found that 40% of circles could be 250 nm or smaller, while reducing supply/demand ratio variation more than homogeneous circles. Supply/demand ratios across centers for heterogeneous circles ranged from 0.06 to 0.13 kidneys per wait-year, compared to 0.04 to 0.47 and 0.05 to 0.15 kidneys per wait-year for 250-nm and 500-nm homogeneous circles, respectively. The average travel distance for kidneys using heterogeneous, and 250-nm and 500-nm fixed-distance circles was 173 nm, 134 nm, and 269 nm, respectively. Heterogeneous circles reduce geographic disparity compared to homogeneous circles, while maintaining reasonable travel distances.

Estimating the effect of focused donor registration efforts on the number of organ donors

Waiting times for organs in the United States are long and vary widely across regions. Donor registration can increase the number of potential donors, but its effect on the actual number of organ transplants depends upon several factors. First among these factors is that deceased donor organ donation requires both that death occur in a way making recovery possible and that authorization to recover organs is obtained. We estimate the potential donor death rate and donor authorization rate conditional on potential donor death by donor registration status for each state and for key demographic groups. With this information, we then develop a simple measure of the value of a new donor registration. This combined measure using information on donor authorization rates and potential death rates varies widely across states and groups, suggesting that focusing registration efforts on high-value groups and locations can significantly increase the overall number of donors. Targeting high-value states raises 26.7 percent more donors than a uniform, nationwide registration effort. Our estimates can also be used to assess alternative, but complementary, policies such as protocols to improve authorization rates for non-registered potential donors.

Local and regional variability in utilization and allocation of hepatitis C virus-infected hearts for transplantation

With the advent of direct-acting antiviral agents, there has been a rapid rise in hepatitis C virus-infected (HCV+) heart transplantation. We aimed to understand local and regional differences in utilization and allocation of HCV+ hearts. Using United Network for Organ Sharing (UNOS) de-identified data from January 1, 2016 to September 30, 2019 we compared trends in the utilization rates (hearts transplanted/donors recovered) of HCV-uninfected (HCV-) to those of HCV+ nonviremic (HCV-NV) and viremic (HCV-V) hearts nationally and by UNOS region. We also evaluated allocation rates (hearts successfully allocated/donors recovered) by organ procurement organization (OPO). We found that (1) in 2019, national utilization rates for HCV-NV and HCV-V hearts were the same as HCV- hearts (27.6% for HCV-NV, 30.9 for HCV-V, and 31.7% for HCV-, P = .277); (2) utilization rates of HCV-NV hearts were low in regions 3 and 4 and of HCV-V hearts in regions 3, 4, and 8 even in the contemporary period since 2018; and (3) there was marked variability in allocation of HCV+ hearts at the OPO level even within the same UNOS region. We conclude that despite national strides in the utilization of HCV+ hearts for transplantation, more aggressive allocation of HCV+ hearts at the OPO level may still significantly affect the organ shortage.

Rejecting bias: The case against race adjustment for OPO performance in communities of color

In December of 2019, the Centers for Medicare and Medicaid Services (CMS) put out a notice of proposed rule-making for 42 CFR Part 486, specifically the section that covers the organ procurement organization (OPO) Conditions for Coverage. Most crucially, the proposed rule included two new OPO performance metrics using objective, standardized data from the Centers for Disease Control and Prevention (CDC). These new metrics would employ a denominator that included inpatient deaths from certain causes that could lead to organ donation, rather than the current unverifiable eligible death metric. Although there has been near-uniform support for replacing the eligible death denominator with CDC data, a source of contention is CMS's proposal not to adjust risk for race in their OPO outcome. Nonetheless, there have been calls for race and ethnicity to be included as risk-adjusted variables in the CMS donation metric. Herein, we lay out an argument as to why inclusion of race and ethnicity as risk adjustment variables in an OPO performance metric is not only statistically suspect but also will hide the inequities that are detrimental to optimal system performance and assurance that all patients have timely access to donation.

Gender and educational attainment influence willingness to donate organs among older Nigerians: a questionnaire survey

Introduction

disparity between the demand for and the supply of organs for transplantation remains a major public health issue of global concern. This study evaluated the knowledge and determinants of willingness to donate organs among outpatient clinic attendees in a Nigerian teaching hospital.

Methods

a 43-item semi-structured interviewer-administered questionnaire was designed to assess awareness and willingness of individuals attending Neurology, Psychiatry and Geriatrics Outpatient clinics to donate bodily organs for transplantation. Association between participants' characteristics and willingness towards organ donation was investigated using logistic regression models.

Results

a total of 412 participants were interviewed and mean age was 46.3 (16.1) years. There were 229 (55.6%) females and 92.5% had at least 6 years of formal education. Overall, 330 (80.1%) were aware of donation of at least one organ for transplantation purposes but only 139 (33.7%) were willing to donate organ. In analyses, adjusting for sex, marital status, family setting and educational status, male gender AOR [2.066(1.331-3.2016)] secondary education [AOR 5.57 (1.205-25.729) p= 0.028] and post-secondary education [AOR-6.98 (1.537-31.702) p= 0.012 were independently associated with willingness towards organ donation.

Conclusion

the survey revealed high level of awareness but poor willingness towards organ donation among older Nigerians attending outpatient clinics of a premier tertiary hospital. Male gender and educational attainment were significantly associated with willingness to donate. Educational programs that particularly target women and less educated older Nigerians are needed to promote organ donation in Nigeria.

Wide Variation in the Percentage of Donation After Circulatory Death Donors Across Donor Service Areas: A Potential Target for Improvement

BACKGROUND

Substantial differences exist in the clinical characteristics of donors across the 58 donor service areas (DSAs). Organ procurement organization (OPO) performance metrics incorporate organs donated after circulatory determination of death (DCDD) donors but do not measure potential DCDD donors.

METHODS

Using 2011-2016 United Network for Organ Sharing data, we examined the variability in DCDD donors/all deceased donors (%DCDD) across DSAs. We supplemented United Network for Organ Sharing data with CDC death records and OPO statistics to characterize underlying process and system factors that may correlate with donors and utilization.

RESULTS

Among 52 184 deceased donors, the %DCDD varied widely across DSAs, with a median of 15.1% (interquartile range [9.3%, 20.9%]; range 0.0%-32.0%). The %DCDD had a modest positive correlation with 4 DSA factors: median match model for end-stage liver disease, proportion of white deaths out of total deaths, kidney center competition, and %DCDD livers by a local transplant center (all Spearman coefficients 0.289-0.464), and negative correlation with 1 factor: mean kidney waiting time (Spearman coefficient -0.388). Adjusting for correlated variables in linear regression explained 46.3% of the variability in %DCDD.

CONCLUSIONS

Donor pool demographics, waitlist metrics, center competition, and DCDD utilization explain only a portion of the variability of DCDD donors. This requires further studies and policy changes to encourage consideration of all possible organ donors.

Addressing Critiques of the Proposed CMS Metric of Organ Procurement Organ Performance: More Data Isn't Better

BACKGROUND

Centers for Medicare and Medicaid Services (CMS) has proposed a rule change to redefine the metric by which organ procurement organizations (OPOs) are evaluated. The metric relies on Centers for Disease Control and Prevention (CDC) data on inpatient deaths from causes consistent with donation among patients <75 years of age. Concerns have been raised that this metric does not account for rates of ventilation, and prevalence of cancer and severe sepsis, without objective data to substantiate or refute such concerns.

METHODS

We estimated OPO-level donation rates using CDC data, and used Agency for Healthcare Research and Quality/Healthcare Cost and Utilization Project data from 43 State Inpatient Databases to calculate "adjusted" donation rates.

RESULTS

The CMS metric and the ventilation-adjusted CMS metric were highly concordant in absolute terms (Spearman and Pearson correlation coefficients ≥0.95). In the Bland-Altman plot, 100% (48/48) of paired values (standard deviations [SDs] of the CMS and "ventilation adjusted" metrics) were within 1.96 SDs of the mean difference, with near-perfect correlation in Passing and Bablok regression (Lin's concordance correlation coefficient: 0.97). The CMS metric and the ventilation/cancer/sepsis-adjusted metric were highly concordant in absolute terms (Spearman and Pearson correlation coefficients ≥0.94). In the Bland-Altman plot, 97.9% (47/48) of paired values (SDs of the CMS and "ventilation/cancer/sepsis adjusted" metrics) were within 1.96 SDs of the mean difference, with near-perfect correlation in the Passing and Bablok regression (Lin's concordance correlation coefficient: 0.97).

CONCLUSIONS

These conclusions should provide CMS, and the transplant community, with comfort that the proposed CMS metric using CDC inpatient death data as a tool to compare OPO is not compromised by its lack of inclusion of ventilation or other comorbidity data.

Deceased Brain Dead Donor Liver Transplantation and Utilization in the United States: Nighttime and Weekend Effects

BACKGROUND

Understanding factors that contribute to liver discards and nonusage is urgently needed to improve organ utilization.

METHODS

Using Scientific Registry of Transplant Recipient data, we studied a national cohort of all US adult, deceased brain dead donor, isolated livers available for transplantation from 2003 to 2016, including organ-specific and system-wide factors that may affect organ procurement and discard rates.

RESULTS

Of 73 686 available livers, 65 316 (88.64%) were recovered for transplant, of which 6454 (9.88%) were ultimately discarded. Livers that were not procured or, on recovery, discarded were more frequently from older, heavier, hepatitis B virus (HCV)+, and more comorbid donors (P < 0.001). However, even after adjustment for organ quality, the odds of liver nonusage were 11% higher on the weekend (defined as donor procurements with cross-clamping occurring from 5:00 PM Friday until 11:59 AM Sunday) compared with weekdays (P < 0.001). Nonuse rates were also higher at night (P < 0.001), defined as donor procurements with cross-clamping occurring from 5:00 PM to 5:00 AM; however, weekend nights had significantly higher nonuse rates compared with weekday nights (P = 0.005). After Share 35, weekend nonusage rates decreased from 21.77% to 19.51% but were still higher than weekday nonusage rates (P = 0.065). Weekend liver nonusage was higher in all 11 United Network of Organ Sharing regions, with an absolute average of 2.00% fewer available livers being used on the weekend compared with weekdays.

CONCLUSIONS

Although unused livers frequently have unfavorable donor characteristics, there are also systemic and operational factors, including time of day and day of the week a liver becomes available, that impact the chance of liver nonprocurement and discard.

Importance of incorporating standardized, verifiable, objective metrics of organ procurement organization performance into discussions about organ allocation

Identifying and supporting specific organ procurement organizations (OPOs) with the greatest opportunity to increase donation rates could significantly increase the number of organs available for transplant. Accomplishing this is complicated by current Scientific Registry of Transplant Recipients/Centers for Medicare & Medicaid Services metrics of donation rates and OPO performance that rely on eligible deaths. These data are self-reported and unverifiable and have been shown to underestimate potential organ donors. We examine the limitations of current OPO performance/donation metrics to inform discussions related to strategies to increase donation. We propose changing to a simple, verifiable, and uniformly applied donation metric. This would allow the transplant community to (1) better understand inherent differences in donor availability based on geography and (2) identify underperforming areas that would benefit from systems improvement agreements to increase donation rates.

How Inaccurate Metrics Hide the True Potential for Organ Donation in the United States

BACKGROUND

There is a discrepancy between the reported increase in donor conversion rates and the number of organs available for transplant.

METHODS

Secondary analysis of data obtained from the Scientific Registry of Transplant Recipients from January 2003 through December 2015 was performed. The primary outcomes were the (1) number of brain-dead donors from whom solid organs were recovered and (2) number of the organs transplanted. Descriptive statistics and growth plots were used to examine the trajectory of organ donation, recovery, and transplantation outcomes over the 11-year period.

RESULTS

From 2003 to 2006, the number of brain-dead donors increased from 6187 to 7375, remaining relatively stable at approximately 7200 thereafter. The average eligible deaths per organ procurement organization dropped from 182.7 (standard deviation [SD]: 131.3) in 2003 to 149.3 (SD: 111.4) in 2015. This suggests a total of 12 493 unrealized potential donors (2006-2015).

CONCLUSIONS

Since 2006, a steady decline in the number of donor-eligible deaths was reported. In 2003, the reported eligible deaths was 11 326. This number peaked in 2004 at 11 346, tumbling to 9781 eligible donors in 2015, despite a 9% increase in the US population. From 2006 to 2015, the data indicate an artificial depression and underestimation of the true potential of brain-dead donors in the United States of conservatively 12 493 donors or 39 728 missing organs. New metrics providing objective but verifiable counts of the donor pool are needed.

Estimated Association Between Organ Availability and Presumed Consent in Solid Organ Transplant

IMPORTANCE

Presumed consent, or an opt-out organ transplant policy, has been adopted by many countries worldwide to increase organ donation. The implication of such a policy for transplants in the United States is uncertain, however.

OBJECTIVE

To simulate the potential implications of a presumed consent policy in the United States.

DESIGN, SETTING, AND PARTICIPANTS

In a decision analytical model, a simulation model was developed using cohort data from January 1, 2004, to December 31, 2014, in the Organ Procurement and Transplantation Network Standard Transplant Analysis and Research files. All US patients (n = 524 359) who were on the waiting list for at least 1 solid organ and all deceased organ donors during the study period were included in the analyses. All data and statistical analyses were performed from January 30, 2019, to July 31, 2019.

MAIN OUTCOMES AND MEASURES

Increase in the organs available for donation and life-years gained associated with a 5%, 15%, or 25% increase in deceased donors, based on the published changes from a presumed consent policy.

RESULTS

This study considered 524 359 unique candidates (aged ≥18 years; 320 908 [61.2%] male) for a solid organ transplant from January 1, 2004, to December 31, 2014. With a base case scenario of a 5% presumed consent-associated increase in donors, the removals (owing to death or illness) from the waiting list for all organs would have an associated 3.2% to 10.4% mean reduction, depending on the random or ideal allocation of new organs to patients on the waiting list. Sensitivity analyses showed that waiting list removals could be decreased up to 52%; however, this reduction was not enough to completely eliminate waiting list removals during the study period. The biggest estimated increases in annual life-years gained associated with a presumed consent policy were in kidney transplant candidates (95% CIs by deceased donor increase: 5% increase, 3440-3466 years; 15% increase, 10 321-10 399 years; 25% increase, 17 201-17 332 years) and liver transplant candidates (95% CIs by deceased donor increase: 5% increase, 898-905 years; 15% increase, 2693-2714 years; 25% increase, 4448-4523 years). Adoption of a presumed consent policy could result in a 4295-year (95% CI, 4277-4313 years) to 11 387-year (95% CI, 11 339-11 435 years) increase in life-years, accounting for the survival advantages associated with a transplant.

CONCLUSIONS AND RELEVANCE

In this study, presumed consent was estimated to be associated with modest but important improvement in the number of organ transplants and increases in life-years gained for patients awaiting an organ transplant. Further consideration and even debate about the ethical and public policy implications of a presumed consent policy are warranted.

Patterns of geographic variability in mortality and eligible deaths between organ procurement organizations

Eligible deaths are currently used as the denominator of the donor conversion ratio to mitigate the effect of varying mortality patterns in the populations served by different organ procurement organizations (OPOs). Eligible death is an OPO-reported metric rather than a product of formal epidemiological analysis, however, and may be confounded with OPO performance. Using Scientific Registry of Transplant Recipients and Centers for Disease Control and Prevention data, patterns of mortality and eligible deaths within each OPO were analyzed with the use of formal geostatistical analysis to determine whether eligible deaths truly reflect the geographic patterns they are intended to mitigate. There was a 2.1-fold difference in mortality between the OPOs with the highest and lowest rates, with significant positive spatial autocorrelation evident in mortality rates (Moran I = .110; P < .001), meaning geographically proximate OPOs tended to have similar mortality rates. The eligible death ratio demonstrated greater variability, with a 4.5-fold difference between the OPOs with the highest and lowest rates. Contrary to the pattern of mortality rates, the geographic distribution of eligible deaths among OPOs was random (Moran I = -.002; P = .410). This finding suggests geographic patterns do not play a significant role in eligible deaths, thus questioning its continuing use in OPO performance comparisons.

Regional Disparities in Transplantation With Deceased Donor Kidneys With Kidney Donor Profile Index Less Than 20% Among Candidates With Top 20% Estimated Post Transplant Survival

INTRODUCTION

The Kidney Allocation System in the United States prioritizes candidates with Estimated Post-Transplant Survival (EPTS) ≤20% to receive deceased donor kidneys with Kidney Donor Profile Index (KDPI) ≤20%.

RESEARCH QUESTION

We compared access to KDPI ≤ 20% kidneys for EPTS ≤ 20% candidates across the United States to determine whether geographic disparities in access to these low KDPI kidneys exist.

DESIGN

We identified all incident adult deceased donor kidney candidates wait-listed January 1, 2015, to March 31, 2018, using United Network for Organ Sharing data. We calculated the proportion of candidates transplanted, final EPTS, and KDPI of transplanted kidneys for candidates listed with EPTS ≤ 20% versus >20%. We compared the odds of receiving a KDPI ≤ 20% deceased donor kidney for EPTS ≤ 20% candidates across regions using logistic regression.

RESULTS

Among 121 069 deceased donor kidney candidates, 28.5% had listing EPTS ≤ 20%. Of these, 16.1% received deceased donor kidney transplants (candidates listed EPTS > 20%: 17.1% transplanted) and 12.3% lost EPTS ≤ 20% status. Only 49.4% of transplanted EPTS ≤ 20% candidates received a KDPI ≤ 20% kidney, and 48.3% of KDPI ≤ 20% kidneys went to recipients with EPTS > 20% at the time of transplantation. Odds of receiving a KDPI ≤ 20% kidney were highest in region 6 and lowest in region 9 (odds ratio 0.19 [0.13 to 0.28]). The ratio of KDPI ≤ 20% donors per EPTS ≤ 20% candidate and likelihood of KDPI ≤ 20% transplantation were strongly correlated (r ² = 0.84).

DISCUSSION

Marked geographic variation in the likelihood of receiving a KDPI ≤ 20% deceased donor kidney among transplanted EPTS ≤ 20% candidates exists and is related to differences in organ availability within allocation borders. Policy changes to improve organ sharing are needed to improve equity in access to low KDPI kidneys.

Understanding of Brain Death Among Health-Care Professionals at a Transplant Center

Introduction:

There is considerable variation in brain death understanding and policies between medical institutions, however, studies have not yet compared different health-care professionals working in the same hospital.

Research Questions:

The overall aim of this study was to evaluate understanding of brain death among health-care professionals within intensive care units (ICUs) at a single institution.

Design:

Study participants included 217 attending physicians, residents, nurses, medical students, and other ICU team members in 6 ICUs. Participants completed a 21-question survey pertaining to knowledge of brain death and related institutional policies as well as opinions about brain death.

Results:

We found a wide range of brain death understanding among health-care professionals in ICUs. Attending physicians have the greatest understanding (94.7%), followed by nurses (72.4%). In contrast, approximately half of the students and residents do not have a basic understanding of brain death. Brain death understanding was correlated to health-care role, years of experience, and whether the participant had formal training in brain death. Although most participants had been involved in cases of brain death, a much smaller number had received formal training on death by neurological criteria.

Discussion:

The present study observed a paucity of clinical training in brain death among health-care professionals in the study ICUs. There is an opportunity for improved clinical education on brain death that could improve communication with families about brain death and potentially increase the number of organs transplanted.

Moving from the HIV Organ Policy Equity Act to HIV Organ Policy Equity in action: changing practice and challenging stigma

PURPOSE OF REVIEW

The HIV Organ Policy Equity (HOPE) Act, signed in 2013, reversed the federal ban on HIV-to-HIV transplantation. In this review, we examine the progress in HOPE implementation, the current status of HIV-to-HIV transplantation, and remaining challenges.

RECENT FINDINGS

Pursuant to the HOPE Act, the Department of Health and Human Services revised federal regulations to allow HIV-to-HIV transplants under research protocols adherent to criteria published by the National Institutes of Health. The first HIV-to-HIV kidney and liver transplants were performed at Johns Hopkins in March of 2016. Legal and practical challenges remain. Further efforts are needed to educate potential HIV+ donors and to support Organ Procurement Organizations. As of November 2017, there are 22 transplant centers approved to perform HIV-to-HIV transplants in 10 United Network for Organ Sharing regions. To date, 16 Organ Procurement Organizations in 22 states have evaluated HIV+ donors. The National Institutes of Health-funded HOPE in Action: A Multicenter Clinical Trial of HIV-to-HIV Deceased Donor (HIVDD) Kidney Transplantation Kidney Trial will launch at 19 transplant centers in December of 2017. A HOPE in Action Multicenter HIVDD Liver Trial is in development.

SUMMARY

Significant progress toward full HOPE implementation has been made though barriers remain. Some challenges are unique to HIV-HIV transplantation, whereas others are amplifications of issues across the current transplant system. In addition to a public health benefit for all transplant candidates in the United States, partnership on the HOPE Act has the potential to address systemic challenges to national donation and transplantation.

Lung Transplantation

Lung transplantation is an appropriate therapeutic option for select patients with end-stage lung diseases and offers the possibility of improved quality of life and longer survival. Unfortunately, the transplant recipient is at risk for numerous immunologic, infectious, and medical complications that threaten both of these goals. Median survival after lung transplantation is approximately 6 years. Optimizing outcomes requires close partnership between the patient, transplant center, and primary medical team. Early referral to a transplant center should be considered for patients with idiopathic pulmonary fibrosis and related interstitial lung diseases due to risk of acute exacerbation and accelerated development of respiratory failure.

Deceased organ donation activity and efficiency in Switzerland between 2008 and 2017: achievements and future challenges

BACKGROUND

Various actions have been taken during the last decade to increase the number of organs from deceased donors available for transplantation in Switzerland. This study provides an overview on key figures of the Swiss deceased organ donation and transplant activity between 2008 and 2017. In addition, it puts the evolution of the Swiss donation program's efficiency in relation to the situation in the neighboring countries.

METHODS

This study is an analysis of prospective registry data, covering the period from 1 January 2008 to 31 December 2017. It includes all actual deceased organ donors (ADD) in Switzerland. Donor data were extracted from the Swiss Organ Allocation System. The "donor conversion index" (DCI) methodology and data was used for the comparison of donation program efficiency in Switzerland, Germany, Austria, Italy and France.

RESULTS

During the study period there were 1116 ADD in Switzerland. The number of ADD per year increased from 91 in 2008 to 145 in 2017 (+ 59%). The reintroduction of the donation after cardiocirculatory death (DCD) program in 2011 resulted in the growth of annual percentages of DCD donors, reaching a maximum of 27% in 2017. The total number of organs transplanted from ADD was 3763 (3.4 ± 1.5 transplants per donor on average). Of these, 48% were kidneys (n = 1814), 24% livers (n = 903), 12% lungs (n = 445), 9% hearts (n = 352) and 7% pancreata or pancreatic islets (n = 249). The donation program efficiency assessment showed an increase of the Swiss DCI from 1.6% in 2008 to 2.7% in 2017 (+ 69%). The most prominent efficiency growth was observed between 2012 and 2017. Even though Swiss donation efficiency increased during the study period, it remained below the DCI of the French and Austrian donation programs.

CONCLUSION

Swiss donation activity and efficiency grew during the last decade. The increased donation efficiency suggests that measures implemented so far were effective. The lower efficiency of the Swiss donation program, compared to the French and Austrian programs, may likely be explained by the lower consent rate in Switzerland. This issue should be addressed in order to achieve the goal of more organs available for transplantation.

Measuring and monitoring equity in access to deceased donor kidney transplantation

The Organ Procurement and Transplantation Network monitors progress toward strategic goals such as increasing the number of transplants and improving waitlisted patient, living donor, and transplant recipient outcomes. However, a methodology for assessing system performance in providing equity in access to transplants was lacking. We present a novel approach for quantifying the degree of disparity in access to deceased donor kidney transplants among waitlisted patients and determine which factors are most associated with disparities. A Poisson rate regression model was built for each of 29 quarterly, period-prevalent cohorts (January 1, 2010-March 31, 2017; 5 years pre-kidney allocation system [KAS], 2 years post-KAS) of active kidney waiting list registrations. Inequity was quantified as the outlier-robust standard deviation (SD_w ) of predicted transplant rates (log scale) among registrations, after "discounting" for intentional, policy-induced disparities (eg, pediatric priority) by holding such factors constant. The overall SD_w declined by 40% after KAS implementation, suggesting substantially increased equity. Risk-adjusted, factor-specific disparities were measured with the SD_w after holding all other factors constant. Disparities associated with calculated panel-reactive antibodies decreased sharply. Donor service area was the factor most associated with access disparities post-KAS. This methodology will help the transplant community evaluate tradeoffs between equity and utility-centric goals when considering new policies and help monitor equity in access as policies change.

Expanding the donor lung pool: how many donations after circulatory death organs are we missing?

BACKGROUND

The number of patients with end-stage pulmonary disease awaiting lung transplantation is at an all-time high, while the supply of available organs remains stagnant. Utilizing donation after circulatory death (DCD) donors may help to address the supply-demand mismatch. The objective of this study is to determine the potential donor pool expansion with increased procurement of DCD organs from patients who die at hospitals.

MATERIAL AND METHODS

The charts of all patients who died at a single, rural, quaternary-care institution between August 2014 and June 2015 were reviewed for lung transplant candidacy. Inclusion criteria were age <65 y, absence of cancer and lung pathology, and cause of death other than respiratory or sepsis.

RESULTS

A total of 857 patients died within a 1-year period and were stratified by age: pediatric <15 y (n = 32, 4%), young 15-64 y (n = 328, 38%), and old >65 y (n = 497, 58%). Those without cancer totaled 778 (90.8%) and 512 (59%) did not have lung pathology. This leaves 85 patients qualifying for DCD lung donation (pediatric n = 10, young n = 75, and old n = 0). Potential donors were significantly more likely to have clear chest X-rays (24.3% versus 10.0%, P < 0.0001) and higher mean PaO2/FiO2 (342.1 versus 197.9, P < 0.0001) compared with ineligible patients.

CONCLUSIONS

A significant number of DCD lungs are available every year from patients who die within hospitals. We estimate the use of suitable DCD lungs could potentially result in a significant increase in the number of lungs available for transplantation.

Outcomes of organ transplants when the donor is a prior recipient

Organ shortage continues to challenge the field of transplantation. One potential group of donors are those who have been transplant recipients themselves, or Organ Donation After Transplant (ODAT) donors. We conducted a retrospective cohort study to describe ODAT donors and to compare outcomes of ODAT grafts versus conventional grafts. From October 1, 1987 to June 30, 2015, 517 former recipients successfully donated 803 organs for transplant. Former kidney recipients generally survived a median of approximately 4 years before becoming an ODAT donor whereas liver, lung, and heart recipients generally survived less than a month prior to donation. In the period June 1, 2005 to December 31, 2014, liver grafts from ODAT donors had a significantly higher risk of graft failure compared to non-ODAT liver transplants (P = .008). Kidney grafts donated by ODAT donors whose initial transplant occurred >1 year prior were associated with significantly increased graft failure (P = .012). Despite increased risk of graft failure amongst certain ODAT grafts, 5-year survival was still high. ODAT donors should be considered another form of expanded criteria donor under these circumstances.

Changing Metrics of Organ Procurement Organization Performance in Order to Increase Organ Donation Rates in the United States

The shortage of deceased-donor organs is compounded by donation metrics that fail to account for the total pool of possible donors, leading to ambiguous donor statistics. We sought to assess potential metrics of organ procurement organizations (OPOs) utilizing data from the Nationwide Inpatient Sample (NIS) from 2009-2012 and State Inpatient Databases (SIDs) from 2008-2014. A possible donor was defined as a ventilated inpatient death ≤75 years of age, without multi-organ system failure, sepsis, or cancer, whose cause of death was consistent with organ donation. These estimates were compared to patient-level data from chart review from two large OPOs. Among 2,907,658 inpatient deaths from 2009-2012, 96,028 (3.3%) were a "possible deceased-organ donor." The two proposed metrics of OPO performance were: (1) donation percentage (percentage of possible deceased-donors who become actual donors; range: 20.0-57.0%); and (2) organs transplanted per possible donor (range: 0.52-1.74). These metrics allow for comparisons of OPO performance and geographic-level donation rates, and identify areas in greatest need of interventions to improve donation rates. We demonstrate that administrative data can be used to identify possible deceased donors in the US and could be a data source for CMS to implement new OPO performance metrics in a standardized fashion.

Outcomes and disparities in liver transplantation will be improved by redistricting-cons

PURPOSE OF REVIEW

Over the last 2 years, the liver transplant community has been debating a proposal to redraw the maps of organ distribution. The basis for these proposed changes is reported disparities in severity of illness at transplantation across the USA - however, this is based on the allocation model for end-stage liver disease score. In this review, we provide a critical overview of the redistribution proposal, its flaws and how it may worsen outcomes and exacerbate disparities in liver transplantation.

RECENT FINDINGS

The main findings we highlight are data questioning the disparity metric used to justify the redistribution. We also review data published in recent articles and presented at public forums questioning whether there truly are disparities in access to transplant care among the broader population with liver disease, and whether disparities even getting to the waitlist are important and not to be ignored.

SUMMARY

This review article highlights major methodological and policy flaws with the current redistribution proposal. We demonstrate how the waitlist disparities that the proposal is intended to fix are not as they seem. Furthermore, if this proposal is passed, outcomes of liver transplantation nationally may worsen, and disparities for those with limited access to healthcare will worsen.

Sociodemographic Determinants of Waitlist and Posttransplant Survival Among End-Stage Liver Disease Patients

While regional organ availability dominates discussions of distribution policy, community-level disparities remain poorly understood. We studied micro-geographic determinants of survival risk and their distribution across Donor Service Areas (DSAs). Scientific Registry of Transplant Recipients records for all adults waitlisted for liver transplantation 2002-2014 were reviewed. The primary exposure variables were county-level sociodemographic risk, as measured by the Community Health Score (CHS), a previously-validated composite index local health conditions, and distance to listing transplant center. Among 114 347 patients, the median CHS was 19.4 (range: 0-40). Compared the lowest risk counties (CHS 1-10), highest-risk counties (CHS 31-40) had more black (14.6% vs. 5.4%), publicly insured (44.9% vs. 33.0), and remote candidates (34.0% vs. 15.1% living >100 miles away). Higher-CHS candidates had greater waitlist mortality in Cox multivariable (HR 1.16 for CHS 31-40, 95% CI 1.11-1.21) and competing risks analysis (sHR 1.07, 95% CI 0.99-1.14). Post-transplant survival was similar across CHS quartiles. Living >25 miles from the transplant center conferred excess mortality risk (sHR 1.08, 95% CI 1.03-1.12). Proposed distribution changes would disproportionately impact DSAs with more high-CHS or distant candidates. Low-income, rural and minority patients experience excess mortality while awaiting transplant, and risk disproportionately worse outcomes with reduced organ availability under current proposals.

Familial Consent for Deceased Organ Donation Among Immigrants and Long-term Residents in Ontario, Canada: A Population-Based Retrospective Cohort Study

Background

Many families choose not to consent to organ donation at the time of their loved one's death. In Ontario, Canada, whether these decisions vary by ethnicity remains unclear.

Objective

To compare the proportion of families of immigrants who consented for deceased organ donation with families of long-term residents.

Design

Population-based retrospective cohort study.

Setting

Potential donors in Ontario, Canada, between November 2008 and March 2013.

Methods

We used linked administrative databases to study the proportion of families who consented for deceased organ donation.

Results

Overall, of the 2873 families of potential donors approached, 1912 (67%) provided consent for deceased organ donation. Families of immigrants were less likely to provide consent compared with families of long-term residents (46% [135 of 291] vs 69% [1777 of 2582]; adjusted rate ratio (RR): 0.72; 95% confidence interval [CI]: 0.63-0.81). When examined by the country of birth, families of immigrants from the following regions were less likely to consent to organ donation compared with long-term residents: South Asia (RR: 0.71; 95% CI: 0.55-0.91), East Asia and Pacific (RR: 0.68; 95% CI: 0.53-0.88) and Middle East, North Africa, and sub-Saharan Africa (RR: 0.58; 95% CI: 0.37-0.91).

Limitations

We could not determine why consent was not obtained. We had a small sample of immigrants. We only had access to the potential donors' information and not the family member who was approached for consent. Many characteristics that we examined were nonmodifiable (eg, age, sex).

Conclusions

In Ontario, families of immigrants are less likely to consent to deceased organ donation. There is an opportunity to better understand the reasons for lower consent among certain immigrant groups.

Regional Differences in Communication Process and Outcomes of Requests for Solid Organ Donation

Although federal mandate prohibits the allocation of solid organs for transplantation based on "accidents of geography," geographic variation of transplantable organs is well documented. This study explores regional differences in communication in requests for organ donation. Administrative data from nine partnering organ procurement organizations and interview data from 1339 family decision makers (FDMs) were compared across eight geographically distinct US donor service areas (DSAs). Authorization for organ donation ranged from 60.4% to 98.1% across DSAs. FDMs from the three regions with the lowest authorization rates reported the lowest levels of satisfaction with the time spent discussing donation and with the request process, discussion of the least donation-related topics, the highest levels of pressure to donate, and the least comfort with the donation decision. Organ procurement organization region predicted authorization (odds ratios ranged from 8.14 to 0.24), as did time spent discussing donation (OR = 2.11), the number of donation-related topics discussed (OR = 1.14), and requesters' communication skill (OR = 1.14). Standardized training for organ donation request staff is needed to ensure the highest quality communication during requests, optimize rates of family authorization to donation in all regions, and increase the supply of organs available for transplantation.

Share 35 changes in center-level liver acceptance practices

Share 35 was implemented to provide improved access to organs for patients with Model for End-Stage Liver Disease (MELD) scores ≥ 35. However, little is known about the impact of Share 35 on organ offer acceptance rates. We evaluated all liver offers to adult patients who were ultimately transplanted between January 1, 2011 and December 31, 2015. The analyses focused on patients ranked in the top 5 positions of a given match run and used multilevel mixed-effects models, clustering on individual wait-list candidate and transplant center. There was a significant interaction between Share 35 era and MELD category (P < 0.001). Comparing offers to MELD score ≥ 35 patients, offers after Share 35 were 36% less likely to be accepted compared with offers to MELD score ≥ 35 patients before Share 35 (adjusted odds ratio, 0.64). There was no clinically meaningful difference in the donor risk index of livers that were declined for patients with an allocation MELD score ≥35 in the pre- versus post-Share 35 era. Organ offer acceptance rates for patients with an allocation MELD ≥ 35 decreased in every region after Share 35; the magnitude of these changes was bigger in regions 2, 3, 4, 5, 6, 7, and 11, compared with regions 8 and 9 that had regional sharing in place before Share 35. There were significant changes in organ offer acceptance rates at the center level before versus after Share 35, and these changes varied across centers (P < 0.001). In conclusion, in liver transplantation candidates achieving a MELD score ≥ 35, liver acceptance of offers declined significantly after implementation of Share 35. The alterations in behavior at the center level suggest that practice patterns changed as a direct result of Share 35. Changes in organ acceptance under even broader organ sharing (redistricting) would likely be even greater, posing major logistical and operational challenges, while potentially increasing discard rates, thus decreasing the total number of transplants nationally. Liver Transplantation 23 604-613 2017 AASLD.

Fair is fair: We must re-allocate livers for transplant

The 11 original regions for organ allocation in the United States were determined by proximity between hospitals that provided deceased donors and transplant programs. As liver transplants became more successful and demand rose, livers became a scarce resource. A national system has been implemented to prioritize liver allocation according to disease severity, but the system still operates within the original procurement regions, some of which have significantly more deceased donor livers. Although each region prioritizes its sickest patients to be liver transplant recipients, the sickest in less liver-scarce regions get transplants much sooner and are at far lower risk of death than the sickest in more liver-scarce regions. This has resulted in drastic and inequitable regional variation in preventable liver disease related death rate.A new region districting proposal - an eight district model - has been carefully designed to reduce geographic inequities, but is being fought by many transplant centers that face less scarcity under the current model. The arguments put forth against the new proposal, couched in terms of fairness and safety, will be examined to show that the new system is technologically feasible, will save more lives, and will not worsen socioeconomic disparity. While the new model is likely not perfect, it is a necessary step toward fair allocation.

Hospital characteristics associated with increased conversion rates among organ donors in New England

BACKGROUND

It is unknown whether hospital characteristics affect institutional performance with regard to organ donation. We sought to determine which hospital- and patient-level characteristics are associated with high organ donor conversion rates after brain death (DBD).

METHODS

Data were extracted from the regional Organ Procurement Organization (2011-2014) and other sources. Hospitals were stratified into high-conversion hospitals (HCH; upper-tertile) and low-conversion hospitals (LCH; lower-tertile) according to conversion rates. Hospital- and patient-characteristics were compared between groups.

RESULTS

There were 564 potential DBD donors in 27 hospitals. Conversion rates differed between hospitals in different states (p < 0.001). HCH were more likely to be small (median bed size 194 vs. 337; p = 0.024), non-teaching hospitals (40% vs. 88%; p = 0.025), non-trauma center (30% vs. 77%; p = 0.040). Potential donors differed between HCH and LCH in race (p < 0.01) and mechanism of injury/disease process (p < 0.01).

CONCLUSION

There is significant variation between hospitals in terms of organ donor conversion rates. This suggests that there is a pool of potential donors in large specialized hospitals that are not successfully converted to DBD.

Portrayal of Brain Death in Film and Television

We sought to evaluate whether television and cinematic coverage of brain death is educational or misleading. We identified 24 accessible productions that addressed brain death using the archives of the Paley Center for Media (160 000 titles) and the Internet Movie Database (3.7 million titles). Productions were reviewed by two board-certified neurologists. Although 19 characters were pronounced brain dead, no productions demonstrated a complete examination to assess for brain death (6 included an assessment for coma, 9 included an evaluation of at least 1 brainstem reflex, but none included an assessment of every brainstem reflex, and 2 included an apnea test). Subjectively, both authors believed only a small fraction of productions (13% A.L., 13% J.W.) provided the public a complete and accurate understanding of brain death. Organ donation was addressed in 17 productions (71%), but both reviewers felt that the discussions about organ donation were professional in a paucity of productions (9% for A.L., 27% for J.W.). Because television and movies serve as a key source for public education, the quality of productions that feature brain death must be improved.

Deceased organ donation for transplantation: Challenges and opportunities

Organ transplantation saves thousands of lives every year but the shortage of donors is a major limiting factor to increase transplantation rates. To allow more patients to be transplanted before they die on the wait-list an increase in the number of donors is necessary. Patients with devastating irreversible brain injury, if medically suitable, are potential deceased donors and strategies are needed to successfully convert them into actual donors. Multiple steps in the process of deceased organ donation can be targeted to increase the number of organs suitable for transplant. In this review, after describing this process, we discuss current challenges and potential strategies to expand the pool of deceased donors.

Type 1 Diabetes and Dysfunctional Intestinal Homeostasis

Despite the relatively high frequency of gastrointestinal (GI) disorders in individuals with type 1 diabetes (T1D), termed diabetic enteropathy (DE), the pathogenic mechanisms of these disorders remain to be elucidated. While previous studies have assumed that DE is a manifestation of diabetic autonomic neuropathy, other contributing factors such as enteric hormones, inflammation, and microbiota were later recognized. More recently, the emerging role of intestinal stem cells (ISCs) in several GI diseases has led to a new understanding of DE. Given the absence of diagnostic methods and the lack of broadly efficacious therapeutic remedies in DE, targeting factors and pathways that control ISC homeostasis and are dysfunctional in DE may represent a new path for the detection and cure of DE.

The OPTN Deceased Donor Potential Study: Implications for Policy and Practice

The Organ Procurement and Transplantation Network (OPTN) Deceased Donor Potential Study, funded by the Health Resources and Services Administration, characterized the current pool of potential deceased donors and estimated changes through 2020. The goal was to inform policy development and suggest practice changes designed to increase the number of donors and organ transplants. Donor estimates used filtering methodologies applied to datasets from the OPTN, the National Center for Health Statistics, and the Agency for Healthcare Research and Quality and used these estimates with the number of actual donors to estimate the potential donor pool through 2020. Projected growth of the donor pool was 0.5% per year through 2020. Potential donor estimates suggested unrealized donor potential across all demographic groups, with the most significant unrealized potential (70%) in the 50-75-year-old age group and potential Donation after Circulatory Death (DCD) donors. Actual transplants that may be realized from potential donors in these categories are constrained by confounding medical comorbidities not identified in administrative databases and by limiting utilization practices for organs from DCD donors. Policy, regulatory, and practice changes encouraging organ procurement and transplantation of a broader population of potential donors may be required to increase transplant numbers in the United States.

Liver transplant center variability in accepting organ offers and its impact on patient survival

BACKGROUND & AIMS

Despite an allocation system designed to give deceased-donor livers to the sickest patients, many transplantable livers are declined by U.S. transplant centers. It is unknown whether centers vary in their propensities to decline organs for the highest priority patients, and how these decisions directly impact patient outcomes.

METHODS

We analyzed Organ Procurement and Transplantation Network (OPTN) data from 5/1/07-6/17/13, and included all adult liver-alone waitlist candidates offered an organ that was ultimately transplanted. We evaluated acceptance rates of liver offers for the highest ranked patients and their subsequent waitlist mortality.

RESULTS

Of the 23,740 unique organ offers, 8882 (37.4%) were accepted for the first-ranked patient. Despite adjusting for organ quality and recipient severity of illness, transplant centers within and across geographic regions varied strikingly (p<0.001) in the percentage of organ offers they accepted for the highest priority patients. Among all patients ranked first on waitlists, the adjusted center-specific organ acceptance rates ranged from 15.7% to 58.1%. In multivariable models, there was a 27% increased odds of waitlist mortality for every 5% absolute decrease in a center's adjusted organ offer acceptance rate (adjusted OR: 1.27, 95% CI: 1.20-1.32). However, the absolute difference in median 5-year adjusted graft survival was 4% between livers accepted for the first-ranked patient, compared to those declined and transplanted at a lower position.

CONCLUSION

There is marked variability in center practices regarding accepting livers allocated to the highest priority patients. Center-level decisions to decline organs substantially increased patients' odds of dying on the waitlist without a transplant.