Publications by authors named "Marc Posner"

Article Synopsis
  • * A study of 1,406 ILDKT recipients revealed that older patients showed increased mortality risk (hazard ratio: 2.07) but similar rates of delayed graft function (DGF) and length of stay (LOS) compared to younger counterparts.
  • * The effects of age on transplant outcomes were consistent across both ILDKT and compatible living donor kidney transplant (CLDKT) groups, suggesting that age should not disqualify older patients from receiving ILDKT.
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Background: Radiocephalic arteriovenous fistula (RCAVF) creation is the preferred first line hemodialysis access procedure. Analysis of diabetic rat arteriovenous fistula model indicates improved vascular function with HMG-CoA-Reductase Inhibitor (statin) use. We predict similar outcomes in diabetic patients undergoing primary RCAVF placement.

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Article Synopsis
  • - The study examined the complications of kidney transplants in incompatible living donor recipients (ILDKTr) who have donor-specific antibodies (DSA) compared to compatible living donor recipients (CLDKTr), focusing on the risks of delayed graft function (DGF) and acute rejection (AR).
  • - Results showed that AR rates were significantly higher in ILDKTr groups with stronger DSA, while DGF rates were slightly elevated but had no greater mortality impact when compared to CLDKTr groups.
  • - The findings suggest that healthcare providers need to assess these risks during pre-surgery discussions and implement strategies to minimize complications in ILDKTr patients.
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Article Synopsis
  • Desensitization protocols for HLA-incompatible living donor kidney transplantation (ILDKT) differ among transplant centers, but their effects on patient outcomes are not well understood.
  • A study involving 1,358 ILDKT recipients across 25 centers aimed to analyze variations in post-transplant mortality and graft loss, finding minimal differences attributable to the centers themselves.
  • Results showed that only a few centers had notably different outcomes, leading to the conclusion that ILDKT practices across diverse centers appear effective without significant negative impact on patient outcomes.
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Thirty percent of kidney transplant recipients are readmitted in the first month posttransplantation. Those with donor-specific antibody requiring desensitization and incompatible live donor kidney transplantation (ILDKT) constitute a unique subpopulation that might be at higher readmission risk. Drawing on a 22-center cohort, 379 ILDKTs with Medicare primary insurance were matched to compatible transplant-matched controls and to waitlist-only matched controls on panel reactive antibody, age, blood group, renal replacement time, prior kidney transplantation, race, gender, diabetes, and transplant date/waitlisting date.

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Concern over transmission of viral infections has been reported to result in higher discard rates of high infectious risk kidneys (HIR) although data on actual viral transmission rates are lacking. At our center, we performed 89 HIR and 533 non-HIR kidney transplants (KTs) between 2004 and 2011. Follow-up screening labs in recipients of HIR kidneys tested for human immunodeficiency virus, hepatitis C virus, and hepatitis B virus did not reveal any cases of viral transmission over median follow-up of 4.

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Background: A report from a high-volume single center indicated a survival benefit of receiving a kidney transplant from an HLA-incompatible live donor as compared with remaining on the waiting list, whether or not a kidney from a deceased donor was received. The generalizability of that finding is unclear.

Methods: In a 22-center study, we estimated the survival benefit for 1025 recipients of kidney transplants from HLA-incompatible live donors who were matched with controls who remained on the waiting list or received a transplant from a deceased donor (waiting-list-or-transplant control group) and controls who remained on the waiting list but did not receive a transplant (waiting-list-only control group).

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Acute rejection after liver transplantation occurs in one-third of all recipients and can be managed with conventional rejection therapy in the majority of cases. In rare instances, patients with severe acute rejection may be refractory to or have contraindications for conventional therapies. This case series evaluates the role of local allograft irradiation (LAI) as an adjunct for patients with rejection that is refractory to or contraindicated for conventional therapies.

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Background: Hepatocellular carcinoma is a major cause of death among patients with cirrhosis. A standardized approach of multimodality therapy with intent-to-treat by transplantation for all patients with hepatocellular carcinoma was instituted at our transplant center in 1997. Data were prospectively collected to evaluate the impact of multimodality therapy on posttransplant patient survival, tumor recurrence, and patient survival without transplantation.

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Background: Single pediatric kidney transplantation (SKT) in adult recipients has traditionally been considered a high risk because of concerns of technical complications leading to poor graft outcomes. The primary goal of this single-center, retrospective analysis was to compare outcomes after SKT to standard-criteria deceased-donor kidney transplantation (SCDKT).

Methods: We compared outcomes in adult recipients after SKT (n=31; mean donor weight, 27 kg); SCDKT (n=283); pediatric en bloc (n=21), living-donor (n=275), and extended criteria-donor (n=100) kidney transplantations.

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Background: Graft-versus-host disease (GVHD) is an uncommon cause of morbidity and mortality after solid organ transplantation that is most likely under-diagnosed. We describe our single center experience with three cases of GVHD diagnosed over a period of 15 years in a total of 2,271 solid organ transplant recipients.

Case Reports: We describe three case reports: (1) a 3-week old neonate who developed GVHD 16 months after living-related liver transplant, (2) a 14-year old adolescent who developed GVHD 4 months following an unrelated cadaveric pancreas transplant and; (3) a 27-year old male who developed GVHD 18 days after simultaneous kidney-pancreas transplant from an unrelated donor.

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Background: Donor selection criteria for adult-to-adult living donor liver transplantation vary with the medical center of evaluation. Living donor evaluation uses considerable resources, and the nonmaturation of potential into actual donors may sometimes prove fatal for patients with end-stage liver disease. On the contrary, a thorough donor evaluation process is mandatory to ensure safe outcomes in otherwise healthy donors.

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Background. In previous reports with a majority of Caucasian patients, peritoneal dialysis (PD) before kidney transplantation has been associated with poor outcomes and higher rates of graft thrombosis and infectious complications than hemodialysis (HD). We report our experience on the outcomes of prerenal transplant peritoneal dialysis in predominantly (73%) African American patient population.

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Unlabelled: The increased disparity between organ supply and need has led to the use of extended criteria donors and donation after cardiac death donors with other comorbidities.

Methods: We have examined the preimplantation transcriptome of 112 kidney transplant recipient samples from 100 deceased-donor kidneys by microarray profiling. Subject groups were segregated based on estimated glomerular filtration rate (eGFR) at 1 month after transplantation: the GFR-high group (n=74) included patients with eGFR 45 mL/min per 1.

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Background: The use of expanded criteria donor kidneys (ECD) had been associated with worse outcomes. Whole gene expression of pre-implantation allograft biopsies from deceased donor kidneys (DDKs) was evaluated to compare the effect of pulsatile pump preservation (PPP) vs. cold storage preservation (CSP) on standard and ECD kidneys.

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Background: Hepatitis B immune globulin (HBIg) with or without nucleos(t)ide analogue (NA) inhibitors has been shown to prevent recurrence of hepatitis B virus (HBV) following orthotopic liver transplantation (OLT). However, the use of HBIg has many disadvantages.

Aims: The present study was performed to determine if converting patients from HBIg ± NA to combination NA therapy could prevent recurrence of HBV.

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Robust biomarkers are needed to identify donor kidneys with poor quality associated with inferior early and longer-term outcome. The occurrence of delayed graft function (DGF) is most often used as a clinical outcome marker to capture poor kidney quality. Gene expression profiles of 92 preimplantation biopsies were evaluated in relation to DGF and estimated glomerular filtration rate (eGFR) to identify preoperative gene transcript changes associated with short-term function.

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Background: En bloc kidneys from pediatric donors have been considered suboptimal for transplantation to adult recipients and their outcomes have rarely been compared with living donor kidney transplantation (LDKT). Traditionally, there has been hesitancy in transplanting en bloc kidneys from donors weighing less than 10 kg due to high risk of technical complications.

Methods: Retrospective chart reviews were performed to compare outcomes after pediatric en bloc (n=20, mean donor weight 11.

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Background: Loss of kidney graft function due to interstitial fibrosis (IF) and tubular atrophy (TA) is the most common cause of kidney allograft loss.

Methods: One hundred one allograft tissues (26 samples with IF/TA, 17 normal allografts, and an independent biopsy group collected at 3 month [n=34] posttransplantation) underwent microarray analysis to identify early detection/diagnostic biomarkers of IF/TA. Profiling of 24 allograft biopsies collected at or after 9-month posttransplantation (range 9-18 months) was used for validation.

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Introduction: Neonatal hemochromatosis is the most common cause of liver failure and liver transplantation in the newborn. The size of the infant determines the liver volume that can be transplanted safely without incurring complications arising from a large graft. Transplantation of monosegments II or III is a standard method for the newborns with liver failure.

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Background: Because of the shortage of organs for transplantation, procurement of kidneys from extended criteria donors is inevitable. Frequently, donors infected with hepatitis C virus (HCV) are used. To elucidate an initial compromise of molecular pathways in HCV graft, gene expression profiles were evaluated.

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It has been 4 years since the first, long-term (> 3 years) prospective comparison of adult-to-adult living donor liver transplantation (A2ALLTx) to adult deceased donor liver transplantation (ADDLTx) was reported. In this follow up, prospective, IRB approved, 10-year comparison of A2ALLTx to ADDLTx we expand on our initial observations. This data includes: age, gender, ethnicity, primary liver disease, waiting time, pretransplant CTP/MELD score, cold ischemia time (CIT), perioperative mortality, acute and chronic rejection, graft and patient survival, charges and post-transplant complications.

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Background: Hyponatraemia increases risk of adverse outcomes following orthotopic liver transplantation (OLT), but it is unclear whether improvement of pretransplant hyponatraemia ameliorates post-transplant complications.

Aims: To assess impact of pretransplant hyponatraemia on post-transplant outcomes.

Methods: We performed a retrospective analysis of 213 patients with cirrhosis who underwent liver transplantation.

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