Graft Recipients Research Articles

Use of Donor Hearts with Low Ejection Fraction in Pediatric Heart Transplantation: A PHTS Analysis

<h3>Purpose</h3> Despite a growing number of children awaiting heart transplant (HT), annual number of HT is relatively unchanged and waitlist mortality is high especially in infants. Donor heart discard rate is also high with ventricular dysfunction as a major reason. Use of donors with low ejection fraction (DLEF) is rare (<15%) in pediatric HT. We evaluated the use of DLEF in pediatric HT using the Pediatric Heart Transplant Society (PHTS) Database. <h3>Methods</h3> PHTS Database was queried from 1/1993 to 12/2020. DLEF was defined as: donor with left ventricular ejection fraction (LVEF) on pre-procurement echo <54% with wall motion abnormality or LVEF <50% irrespective of wall motion abnormality Donor and recipient characteristics, graft survival and trends of DLEF use across regions and eras were compared. <h3>Results</h3> Of 7520 pediatric HT, 7237 (96%) had a donor echo report but only 6332 (84%) had a LVEF reported. Of these, 143 (2.3%) were DLEF with median LVEF 47% [IQR 44-50%]. Focal or diffuse wall motion abnormality was seen in 35 (24%) and 23 (16%) had abnormal septal motion. Recipient characteristics between groups including age, diagnosis, end-organ function, use of VAD and/or ECMO at listing or transplant were similar. Mechanical ventilation at HT (p=.0082), earlier era (p<.0001), and regional variation (p<.0001) were associated with increased use of DLEF. Donor characteristics were similar with the exception that DLEF were more likely to be on epinephrine (20.7% vs 9.9%, p=<.0001) and/or vasopressin (73% vs 54%, p=.0018). DLEF use decreased over time (1993-2002: 4.26%; 2003-12: 2.18%; 2013-20: 1.6%). Differences were seen across UNOS regions (Region 4 vs 10: 0.9% vs 4.2%, p=<.0001). Graft survival at 3 months post-HT was similar for DLEF vs non-DLEF donors (91% vs. 94%, logrank p=0.1) (Fig 1). <h3>Conclusion</h3> Use of DLEF in pediatric HT is limited and lower than previously reported. Use of DLEF has decreased over time. DLEF had comparable graft survival at 3 months post-HT, supporting efforts to expand the use of DLEF in pediatric HT.

Longitudinal Echocardiographic Assessment of Donor Hearts in DCD Donors Using Thoracoabdominal Normothermic Regional Perfusion

<h3>Purpose</h3> In the U.S., multiple centers are beginning to develop protocols for DCD organ donation. We describe our intraoperative echo thoracoabdominal normothermic regional perfusion (TA-NRP) DCD protocol for initial donor acceptance and mid-term follow up <h3>Methods</h3> After identification of a suitable DCD donor, withdrawal of life support is performed in the OR until circulatory death occurs. After 5 minutes of observation, circulatory death is declared. The sternum is opened, cerebral vessels are ligated, and cardiopulmonary bypass (CPB) is initiated. Transesophageal echocardiogram (TEE) monitors the following parameters to ensure the heart is acceptable: left ventricular ejection fraction (LVEF) ≥50%, mitral valve annulus lateral S wave (MV S wave) ≥10 cm/sec, left ventricular outflow tract time integral (LVOT VTI) ≥15 cm, and right ventricular systolic function (RVEF) normal by visual estimation. The recipient's LVEF and global longitudinal strain rate (GLS) were followed longitudinally for up to 18 months <h3>Results</h3> From January 2020 to October 2021, 10 TA-NRP DCD transplants were performed: 7 isolated hearts, 2 heart-bilateral lung, and 1heart-kidney. Median donor age was 43.5 years (26-51) and there were 9 males (90%). Fifty percent of donors had a history of opioid drug overdose. The mean preoperative donor LVEF was 68%. Mean TEE parameters while weaning off CPB: LVEF 65%, MV lateral S wave 12 cm/sec, and LVOT VTI 19 cm. RVSF was normal for all donors. None of the donors required inotropic support. The recipient median age was 54 years (44-72) and 70% were male. None of the recipients developed cardiac graft failure. At mean follow-up of 392 days, mean LVEF is 64% and mean GLS is -16.7% and all patients are alive. <h3>Conclusion</h3> A standardized intraoperative TEE protocol to assess TA-NRP DCD donor heart function while weaning CPB is of paramount importance to ensure excellent longitudinal recipient graft function.

Risk factors associated with diabetes after liver transplant.

Post-transplant diabetes mellitus (PTDM) is a common metabolic complication after liver transplant that negatively affects a recipient's survival and graft function. This study aims to identify risk factors associated with diabetes after liver transplant. This is a cross-sectional study conducted from September to November 2019. Data collection was performed by chart review, and patients were divided into 3 groups: patients without diabetes mellitus (DM), patients with pre-transplant diabetes mellitus, and patients with PTDM. Two hundred and forty-seven patients' medical charts were screened, and 207 patients were included: 107 without DM, 42 with pre-transplant DM, and 58 with PTDM. The leading cause for liver transplant was hepatitis C, followed by hepatocellular carcinoma secondary to alcohol. There was a higher exposure to tacrolimus in patients without DM (P = 0.02) and to ciclosporin in patients with pre-transplant DM, compared to others (P = 0.005). Microscopic interface inflammatory activity was more severe in patients without DM as well as those with PTDM (P = 0.032). There was a higher prevalence of steatosis in recipients with pre-transplant DM than there was in others (P < 0.001). Multivariate logistic regression identified the following independent risk factors for DM: cirrhosis due to alcohol, hepatitis C, and triglycerides. For PTDM, these independent risk factors were cirrhosis due to alcohol, hepatitis C, and prednisone exposure. Alcoholic cirrhosis is a risk factor for PTDM in liver recipients. Liver transplant recipients with a pre-transplant history of cirrhosis due to alcohol, hepatitis C, and prednisone exposure deserve more caution during PTDM screening.

Living Donor Liver Transplantation vs. Split Liver Transplantation Using Left Lateral Segment Grafts in Pediatric Recipients: An Analysis of the UNOS Database.

Split and LDLT in pediatric patients have the potential to decrease wait times and waitlist mortality. Using UNOS-STAR data, we compared outcomes of pediatric patients undergoing LDLT and SLT using LLS grafts. The baseline characteristics and post-operative outcomes were compared between groups. Actuarial graft and patient survival were analyzed with Kaplan-Meier curves. Between 2010 and 2019, 911 pediatric LT were included in the analysis (LD graft group, n = 508, split graft group, n = 403). LD graft recipients spent more time on the waitlist vs. the split graft group (60 (22–138) days vs. 46 (16–108) days; p = 0.007). LD recipients had a lower rate of graft failure, found in 9.8% of patients compared with 14.6% in the split graft group (p = 0.02). HAT was the most common graft failure cause, with similar rates. Graft and patient survival at 1-, 3-, and 5-years was comparable between LDLT and SLT. In subgroup analyses, patients with biliary atresia, those ≤10 kg or ≤10 years old receiving an LD graft showed improved graft survival. In conclusion, LDLT is associated with a lower rate of graft failure in pediatric patients. The use of LLS regardless of the type of donor is a safe way to facilitate access to transplantation to pediatric patients with acceptable short and long-term outcomes.

Lateral spine dual-energy X-ray absorptiometry and the risk of fragility fractures in long-term kidney graft recipients.

Although the prevalence of osteoporosis and fractures in the first 6-12months post-renal transplantation is high, little is known about the utility of bone mineral density (BMD) to predict fractures in long-term kidney graft recipients. Lateral spine dual-energy X-ray absorptiometry (DXA) scanning is a reliable tool for measuring glucocorticoid-induced and age-related bone loss in the elderly population. However, little is known about the utility of lateral spine DXA for patients with chronic kidney diseases. This study aimed to analyze the utility of lateral spine BMD for fragility fractures in long-term kidney graft recipients. A total of 357 stable kidney transplant recipients for a minimum of 1year after kidney transplantation underwent DXA measurements at several sites, including the lateral spine between January 2017 and December 2018. We collected data on new incident fractures from the patients' medical records. The median post-transplantation time at baseline DXA measurement was 12.6years. During the median follow-up period of 3.5years, 41 (11.4%) fractures occurred. The lateral spine BMDs were independently associated with fractures (adjusted hazard ratio 0.076; 95% confidence interval 0.012-0.42, p = 0.003). The cumulative incidence rate of fractures was significantly higher in the lower lateral spine BMD group (< 0.471g/cm2, optimal cut-off value by receiver operating characteristic curve) than in the higher lateral spine BMD group (23.4 vs. 7.4%, adjusted hazard ratio 4.92; 95% confidence interval 2.33-10.74, p < 0.001). Lateral lumbar spine BMD can be used to predict the risk of fragility fractures in long-term kidney graft recipients.

The Course of COVID-19 Infection in Patients After Pancreas and Kidney Transplantation: A Single-Center Observation

Solid graft recipients are at an increased risk of serious complications and death. Out of 130 outpatient recipients of pancreas grafts at our Clinic, 20 patients (15.73%) had a confirmed severe acute respiratory syndrome coronavirus 2 infection (SARS-CoV-2). Each patient had a different course of the disease, and the forms of infection varied from mild to severe and lethal. According to recommendations, after confirmation of the infection, mycophenolate mofetil was withdrawn and the immunosuppression was based on steroids and a calcineurin inhibitor. In this study, we performed an analysis of the course of COVID-19 infection in patients after pancreatic transplantation. Twenty pancreas recipients were confirmed to have COVID-19 infections; 4 of whom required hospitalization owing to severe complications. Patients reported weakness, excessive intensity of fatigue, shortness of breath with exertion, cough, and periodically increased temperature. Weakness and fatigue persisted in these patients for about 6 weeks. In 2 patients there was a need for oxygen supplementation and empirical antibiotic. Mortality was 5%, and there was 1 graftectomy. Deterioration of either kidney or pancreas graft were not observed in any other patients.The course of SARS-CoV-2 infection in solid graft recipients is similar to that of the rest of the population. Because of immunosuppression, recipients were accustomed to avoiding crowds and complying with obligations to wear masks.

Pre-Transplant Expression of CCR-2 in Kidney Transplant Recipients Is Associated With the Development of Delayed Graft Function.

BackgroundDelayed graft function (DGF) leads to a reduced graft survival. Donors’ features have been always considered as key pathogenic factors in this setting. The aim of our study was to evaluate the recipients’ characteristics in the development of DGF.MethodsWe enrolled 932 kidney graft recipients from 466 donors; 226 recipients experienced DGF. In 290 donors, both recipients presented with early graft function (EGF, group A), in 50 both recipients experienced DGF (group B), and in 126 one recipient presented with DGF and the other with EGF (group C). In group C, we selected 7 couples of DGF/EGF recipients and we evaluated the transcriptomic profile by microarray on circulating mononuclear cells harvested before transplantation. Results were validated by qPCR in an independent group of 25 EGF/DGF couples.FindingsIn the whole study group, DGF was associated with clinical characteristics related to both donors and recipient. In group C, DGF was significantly associated with body mass index, hemodialysis, and number of mismatches. In the same group, we identified 411 genes differently expressed before transplantation between recipients discordant for the transplant outcome. Those genes were involved in immune dysfunction and inflammation. In particular, we observed a significant increase in DGF patients in the expression of C–C chemokine receptor type 2 (CCR2), the monocyte chemoattractant protein-1 (MCP-1) receptor. CCR-2 upregulation was confirmed in an independent cohort of patients.ConclusionsOur results suggest that recipients’ clinical/immunological features, potentially modulated by dialysis, are associated with the development of DGF independently of donors’ features.

Factors Affecting the Success Rate of Preloaded Descemet Membrane Endothelial Keratoplasty With Endothelium-Inward Technique: A Multicenter Clinical Study

To evaluate factors affecting the outcomes of preloaded Descemet membrane endothelial keratoplasty (pl-DMEK) with endothelium-inward. Retrospective clinical case series and a comparative tissue preparation study. Participants: Fifty-five donor tissues for ex vivo study and 147 eyes of 147 patients indicated with Fuchs endothelial dystrophy or pseudophakic bullous keratopathy with or without cataract. Standardized DMEK peeling was performed with 9.5-mm-diameter trephination followed by second trephination for loading the graft (8.0-9.5 mm diameter). The tissues were manually preloaded with endothelium-inward and preserved for 4 days or shipped for transplantation. Live and dead assay and immunostaining was performed on ex vivo tissues. For the clinical study, the tissues were delivered using bimanual pull-through technique followed by air tamponade at all the centers. Tissue characteristics, donor and recipient factors, rebubbling rate, endothelial cell loss (ECL), and corrected distance visual acuity (CDVA) at 3, 6, and 12 months. At day 4, significant cell loss (P=.04) was observed in pl-DMEK with loss of biomarker expression seen in prestripped and pl-DMEK tissues. Rebubbling was observed in 40.24% cases. Average ECL at 3, 6, and 12 months was 45.87%, 40.98%, and 47.54%, respectively. CDVA improved significantly at 3 months postoperation (0.23 ± 0.37 logMAR) (P < .01) compared to the baseline (0.79 ± 0.61 logMAR). A significant association (P < .05) between graft diameter, preservation time, recipient gender, gender mismatch, and recipient age to rebubbling rate was observed. Graft loading to delivery time of pl-DMEK tissues in endothelium-inward fashion must be limited to 4 days after processing. Rebubbling rate and overall surgical outcomes following preloaded DMEK can be multifactorial and center-specific.

Multimodality Imaging after Liver Transplant: Top 10 Important Complications.

Patients who have undergone liver transplant are now regularly seen in day-to-day radiology practice. All surgical techniques for liver transplant require arterial, portal venous, hepatic venous and caval, and biliary anastomoses. This review is focused on the 10 "not to be missed" complications of liver transplant that affect the health and life of the graft and graft recipient. Arterial complications are the most common and devastating. Early hepatic artery thrombosis may be catastrophic because the biliary tree is solely dependent on the hepatic artery after transplant and collateral vessels have not yet formed. In contrast, delayed hepatic artery thrombosis may be more insidious as collateral arteries develop. US findings of delayed hepatic artery thrombosis may be similar to those of hepatic artery stenosis and celiac artery stenosis. Splenic artery steal syndrome is an increasingly recognized cause of graft ischemia. Venous complications are much less common. Hepatic venous and caval complications are notable for their increased incidence in living-donor and pediatric transplants. Biliary complications often result from arterial ischemia. Biliary cast syndrome is a notable example in which ischemic biliary mucosa sloughs into and obstructs the duct lumens. Neoplasms also may occur within the hepatic graft and may be due to recurrent malignancy, posttransplant lymphoproliferative disorder, or metastases. US is the initial imaging modality of choice, particularly in the acute postoperative setting. Further evaluation with contrast-enhanced US, CT, or MRI; catheter angiography; endoscopic retrograde cholangiopancreatography; and/or nuclear medicine studies is performed as needed. An invited commentary by Bhargava is available online. Online supplemental material is available for this article. ©RSNA, 2022.

Donation after Circulatory Death Liver Transplantation in Paediatric Recipients

Waiting list mortality together, with limited availability of organs, are one of the major challenges in liver transplantation (LT). Especially in the paediatric population, another limiting factor is the scarcity of transplantable liver grafts due to additional concerns regarding graft size matching. In adults, donation after circulatory death (DCD) liver grafts have been used to expand the donor pool with satisfactory results. Although several studies suggest that DCD livers could also be used in paediatric recipients with good outcomes, their utilisation in children is still limited to a small number of reports. Novel organ perfusion strategies could be used to improve organ quality and help to increase the number of DCD grafts utilised for children. With the current manuscript, we present the available literature of LT using DCD grafts in paediatric recipients, discussing current challenges with the use of these livers in children and how machine perfusion technologies could be of impact in the future.

Rapid Access in Donation After Circulatory Death (DCD): The Single-Center Experience With a Classic Pathway in Uncontrolled DCD Algorithm

In Poland, 95% of organs for transplantation come from donation after brain death (DBD). In 2010, Poland officially joined the European countries in which donation after circulatory death is accepted by law. Currently, the Pomeranian Medical University Transplant Center is the only active location for uncontrolled donation after circulatory death (uDCD) in Poland. To estimate the results of uDCD kidney transplantation with a classical approach to organ recovery, we analyzed data from an early phase of uDCD program. Prospective observation of uDCD kidney allografts (group 1; n=8) compared with DBD kidney allografts (group 2; n=30). The organ recovery protocol was set up on rapid abdominal access without regional perfusion before procurement. The organs recovered from uDCD during a 24-month period increased the volume of kidneys transplanted at the center by 9.2%. Delayed graft function was diagnosed in 100% vs 46% of allografts (P=.03), respectively. Nevertheless, early posttransplant follow-up did not reveal any graft loss or recipient death cases in the DCD group. After 12 months of follow-up, the mean glomerular filtration rate was 44.5 vs 57.9 mL/min (P < .02), respectively. Crucial factors for acceptable results of uDCD are strict pretransplant assessment of recovered organs and efficient coordination of the transplant team. Conservative recovery protocol in uDCD under strict prerequisites is feasible to consider in the organ procurement pathway. Preliminary results provide space for an increase in the organ donor pool.

Small-for-Size versus Standard-Size Graft in Living Donor Liver Transplantation.

To compare the outcome of small-for-size grafts versus standard-size grafts regarding the frequency of postoperative complications, early graft dysfunction, and 1-year survival. Retrospective cohort study. Pir Abdul Qadir Shah Jeelani Institute of Medical Sciences (PAQSJIMS) Hospital, Gambat, Sindh, Pakistan from March 2019 to April 2020. A total of 147 living donor liver transplant recipients' data were retrospectively evaluated. Study participants were divided into two groups; small-for-size graft (GRWR <0.8%) and standard-size graft (GRWR >0.8%). Recipients' demographics, graft characteristics, operative parameters, postoperative complications, and graft survival were compared in both groups. Out of 147 recipients, 21 were found to have small-for-size graft, while 126 patients had the standard-size graft. Mean GRWR in small-for-size graft group was 0.73 + 0.4 (0.63-0.79), while 0.93 + 0.82 (0.81-3.0) in standard-size graft group. A statistically significant difference was found while comparing body mass index (p <0.001), hepatic venous reconstruction (p = 0.013), and liver attenuation index (p <0.001) between both study groups. While all other recipient and donor characteristics, demographical data, operative variables, postoperative lab, and complications were comparable in both groups (p >0.05). Kaplan-Meier analysis showed that 1-year survival rate for small-for-size graft recipients was 90.5%, while the survival rate for the standard-size graft was 96.0% (p = 0.272). Frequency of post-op complications was comparable in both groups. The graft survival in small-for-size grafts was as good as for standard-size grafts. Key Words: Living donor liver transplantation, GRWR, Small-for-size graft, Standard-size graft.

363 - Combinatorial Cytokine Secretion Signature of Donor-Derived T Cells Infused with the Graft and Baseline Recipient Serum Cytokine Profiles As Potential Biomarkers of Acute Graft-Versus-Host Disease in αβT-Cell/CD19 B-Cell Depleted Hematopoietic Stem Cell Transplant Pediatric Recipients

363 - Combinatorial Cytokine Secretion Signature of Donor-Derived T Cells Infused with the Graft and Baseline Recipient Serum Cytokine Profiles As Potential Biomarkers of Acute Graft-Versus-Host Disease in αβT-Cell/CD19 B-Cell Depleted Hematopoietic Stem Cell Transplant Pediatric Recipients

Single-center experience with perioperative antibiotic prophylaxis and surgical site infections in kidney transplant recipients

BackgroundInfections in kidney transplant recipients are particularly challenging owing to the immunosuppressive treatment, usually long history of chronic illness, comorbidities and prior exposures to antibiotics. Among the most common complications early after surgery are surgical site infections. The aim of this study was to identify risk factors and evaluate epidemiological data regarding surgical site infections. Moreover, we were able to compare the current results with historical data from our institution when different perioperative antibiotic prophylaxis was practiced.MethodsWe conducted a retrospective case–control study in a group of 254 deceased donor renal graft recipients transplanted in a single Central European institution. We evaluated epidemiological findings and resistance patterns of pathogens causing surgical site infections. We used multivariable logistic regression to determine risk factors for surgical site infections.ResultsWe revealed no differences in baseline characteristics between patients with and without surgical site infections. Ten surgical site infections (3.9%) were diagnosed (six superficial incisional, two deep incisional, and two organ/space). Eight species (19 strains) were identified, most of which were multi-drug resistant (63%). The most common was extended-spectrum β-lactamase producing Klebsiella pneumoniae (26%). We showed that statistically significant differences were present between reoperated and non-reoperated patients (adjusted odds ratio: 6.963, 95% confidence interval 1.523–31.842, P = .012).ConclusionsReoperation is an individual risk factor for surgical site infection after kidney transplantation. According to our experience, cefazolin-based prophylaxis can be safe and is associated with relatively low prevalence of surgical site infections.

Evaluation of Magnetic Resonance Elastography and Transient Elastography for Liver Fibrosis and Steatosis Assessments in the Liver Transplant Setting.

Liver graft fibrosis affects long-term graft and patient survival in liver transplant recipients. Transient elastography and magnetic resonance elastography are widely used for the assessment of liver fibrosis in routine clinical practice, but are limited in liver transplant settings. The aims of the present study were to evaluate the accuracy of magnetic resonance elastography and transient elastograph in the assessment of liver fibrosis in liver transplant recipients, and to determine the recurrence rates of post-transplant hepatic steatosis and liver fibrosis. A total of 126 consecutive liver transplant recipients were included. Magnetic resonance elastography and transient elastography were performed for to measure liver stiffness. The most common cause of liver transplantation was hepatitis B virus-induced cirrhosis (50%). The mean liver stiffness value with transient elastography was 6.1 ± 3.0 kPa, and the mean magnetic resonance elastography value was 2.7 ± 1.0 kPa. A significant positive correlation was found between magnetic resonance elastography and transient elastography in terms of liver stiffness measurement (r = 0.61, P < .001). Obesity and the underlying etiology of liver diseases did not have any significant negative effect on magnetic resonance elastography and transient elastography measurements. During the follow-up, the post-transplant recurrence rates of hepatic steatosis and hepatic fibrosis were 26% and 37%, respectively. The recurrence rates of post-transplant hepatic steatosis and liver fibrosis were slightly higher in recipients with non-alcoholic fatty liver disease-related cirrhosis than those with viral hepatitisrelated etiologies (44% vs 27%, P = .43; 44% vs 30%, P = .45, respectively). Magnetic resonance elastography and transient elastography are accurate in assessing liver fibrosis in the liver transplant setting. Obesity and the underlying etiology of primary liver disease do not influence the measurements.

Dimensional changes of keratinized mucosa after accordion versus conventional free gingival graft around dental implants: A randomized two-arm parallel clinical trial.

Free gingival graft (FGG) is the most effective way to increase the apico-coronal width of the keratinized mucosa. In case of limited donor tissue, the accordion technique can be used. This study compared FGG for dimensional and clinical changes using accordion and conventional methods. Ninety-four implants with keratinized tissue deficiency (<2mm) were randomly assigned to treatment with accordion (49 implants) and conventional (45 implants) FGG. Endpoints including apico-coronal keratinized tissue width, vertical shrinkage, vestibular depth, probing depth, bleeding on probing, and plaque index were measured. The graft harvesting and recipient bed preparation method were similar in the two groups, and the only difference was the graft length. FGG was harvested with a length 40% shorter than the mesiodistal length of the recipient area in the accordion method and as much as the recipient area in the conventional method. vertical graft shrinkage 1, 3, and 6months following conventional graft placement was 12.04±14.99, 17.12±20.40, and 23.29±24.63 percent, respectively. In the accordion graft group, the shrinkage was significantly greater with 30.10±16.12, 36.99±15.51, and 43.75±18.78 percent at 1, 3, and 6months, respectively (p-value<.001). Other factors did not show a clinically significant difference between the two groups. Comparison of vertical shrinkage changes shows that the shrinkage rate in the accordion group is significantly higher than the conventional group. IRCT20190721044296N1 (Evaluation of dimensional changes of peri-implant attached mucosa following the treatment of free gingival graft by conventional and accordion methods; randomized clinical trial two-arm parallel).

Arthroscopic Patellar Osteochondral Transplantation

The undersurface location of the patellar articular cartilage presents unique challenges to osteochondral defect treatment. Current osteochondral grafting techniques and instrumentation require arthrotomy and patellar eversion to access the defect with the necessary perpendicular trajectory. We describe an all-arthroscopic patellar osteochondral grafting technique, with transpatellar retrograde reaming for recipient socket creation and graft fixation, to treat focal patellar cartilage defects.

Time to Move on: HLA Matching Should Be Reconsidered in Modern Deceased Donor Kidney Allocation.

Background.HLA matching has been the cornerstone of deceased donor kidney allocation policies worldwide but can lead to racial inequity. Although HLA matching has been shown to improve clinical outcomes, the long-term impacts of nonallogenic factors are being increasingly recognized. This has led some transplant programs to include points for nonallogenic factors, for example, age. Our study looks at long-term graft and patient outcomes based on allocation cohorts rather than individual number of HLA mismatches.Methods.Using the Australia and New Zealand Dialysis and Transplant Registry, we analyzed 7440 adult deceased donor transplant events from 2000 to 2018. Transplants were classified as HLA matched or nonmatched according to the OrganMatch score and the local allocation algorithms. Graft function was studied with linear mixed modeling and graft rejection with logistic and binomial regression. Time to graft failure and recipient survival were examined with Kaplan–Meier curve and Cox regression models.Results.Forty percent of transplants were HLA matched. Mean glomerular filtration rate was 1.76 mL/min/1.73 m2 higher in the matched transplants (P < 0.001). Matched transplants had longer time to graft failure (15.9 versus 12.7 y; P < 0.001) and improved recipient survival (risk of death hazard ratio, 0.83; P = 0.003). Matched recipients spent less time on dialysis (28.1 versus 44.8 mo; P < 0.001), and this significantly contributed to the benefits seen in graft loss and recipient survival. Caucasian recipients were more likely to receive a matched transplant than non-Caucasians.Conclusions.Matched transplants showed benefits in graft and recipient outcomes; however, some of these results were of small magnitude, whereas others seemed to be due in part to a reduction in time on dialysis. The benefit for the matched cohort came at the expense of the nonmatched cohort, who spent longer on dialysis and were more likely to be of a minority racial background.

Organ donation after circulatory death as compared with organ donation after brain death in Switzerland - an observational study.

Organ donation after circulatory death (DCD) was reintroduced in Switzerland in 2011 and accounts for a third of deceased organ donors today. Controversy persists if DCD transplants are of similar quality to transplants following donation after brain death (DBD), mainly due to warm ischaemia time DCD organs are exposed to. We compared DCD with DBD in Switzerland. Data on deceased adults who were referred to and approved for organ donation from 1 September 2011 to 31 December 2019 were retrospectively analysed (217 DCD, 840 DBD donors). We compared DCD and DBD donor/organ characteristics, transplant rates of lungs, liver, kidneys, and pancreas, and early liver and kidney graft function in the recipient. The effect of DCD/DBD on transplant rates (organ transplanted or not) and 72-hour recipient graft function (moderate/good vs delayed graft function / organ loss) was analysed using multivariable logistic regression. Among utilised DCD donors, we analysed the effect of functional warm ischaemia time (FWIT) and donor age on 72-hour post-transplant liver and kidney graft function, also using multivariable logistic regression. DCD donors were more often male (64.5% vs 56.8% p = 0.039), presented with heart disease (36.4% vs 25.5%, p <0.001), were resuscitated before hospital admission (41.9% vs 30.7%, p = 0.006), and died from anoxia (41.9% vs 23.9%). Kidney function before transplantation was comparable, lung, liver and pancreas function were poorer in DCD than DBD. Eighty-one and 91% of approved DCD and DBD donors were utilised (p <0.001). Median FWIT in DCD was 29 minutes (interquartile range 25-35). DCD transplant rates ranged from 4% (pancreas) to 73% (left kidney) and were all lower compared with DBD. Seventy-two-hour liver graft function was comparable between DCD and DBD (94.2% vs 96.6% moderate/good, p = 0.199). DCD kidney transplants showed increased risk of delayed graft function or early organ loss (odds ratios 8.32 and 5.05; 95% confidence intervals CI 5.28-13.28 and 3.22-7.95; both p <0.001, for left and right kidney transplants, respectively). No negative effect of prolonged FWIT or higher donor age was detected. Despite less favourable donor/organ characteristics compared with donation after brain death, donation after circulatory death donors are increasingly referred and today provide an important source for scarce transplants in Switzerland. We identified a higher risk for delayed graft function or early organ loss for DCD kidney transplants, but not for DCD liver transplants. When carefully selected and allowed for other risk factors in organ allocation, prolonged functional warm ischaemia time or higher age in donation after circulatory death does not seem to be associated with impaired graft function early after transplantation.

Long-Term Outcomes of Kidney Transplant Recipients with Glomerulonephritides by Induction Type and Steroid Avoidance

Kidney transplant programs have different approaches to induction immunosuppression, and conflicting data exist on the role of steroid maintenance in recipients with glomerulonephritis (GN). GN patients are unique because of a higher risk for immune system exhaustion due to prior exposure to immunosuppressants to treat their GN; this raises questions regarding the optimal immunosuppression needed for transplant success and reduction of complications. We sought to assess the effect of induction type and steroid maintenance on the recipient and kidney graft survival in those with IgA nephropathy (IgAN), systemic lupus erythematosus related GN (SLE), small-vessel vasculitis (SVV), and anti-glomerular basement membrane disease (anti-GBM). We analyzed the Scientific Registry of Transplant Recipients (SRTR) database for adult, primary kidney recipients with the above glomerulonephritides through September 2019. Kaplan–Meier curves were generated to examine kidney graft and recipient survival. We used multivariable Cox proportional hazard models to investigate the impact of induction type and steroid maintenance in each group separately. Our study included 9176 IgAN, 5355 SLE, 1189 SVV, and 660 anti-GBM recipients. Neither induction type nor steroid maintenance therapy influenced recipient or death-censored graft survival in this cohort of recipients. Our findings provide an opportunity for recipients with a history of one of the studied glomerulonephritides to receive a more tailored immunosuppression regimen, considering their previous exposure to immunosuppressants.