Publications by authors named "Samy Riad"

This study aimed to identify the parenchymal structural features by both computed tomography (CT) and histology that are associated with death-censored graft failure in recipients of living donor kidneys. We analyzed kidney recipients of ABO-compatible living donor kidneys from 2000-2020 with follow-up through 2023. Cortical volume and thickness, individual medullary pyramid volume and count, glomerular volume, nephrosclerosis, and nephron number were assessed by deep learning models applied to the predonation CT and by morphometric histology analysis from the biopsy at the time of transplantation.

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Treating acute rejection of a pancreas transplant in a severely immunocompromised patient with viral opportunistic infection is challenging due to the balance of rescuing from rejection without worsening the morbidity of infection and prolonging the infection episode. We present a case involving a pancreas-after-kidney transplant in a patient with cytomegalovirus (CMV) high-risk discordance (donor positive/recipient negative) and chronic lymphopenia who developed difficult-to-treat CMV disease approximately 6 months after pancreas transplantation. Following the withdrawal of the antimetabolite due to the persistent CMV DNAemia and lymphopenia, the patient experienced acute pancreas rejection without adequate and sustained response to treatment with steroids and thymoglobulin.

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Background: The limitations of conventional measures of socioeconomic status (SES) limit our ability to elucidate the role of SES as a key element of social determinants of health in kidney transplantation. This study's objective was to use an innovative SES measure, the HOUsing-based SES measure (HOUSES) index, to examine the effects of social determinants of health on access to and outcomes of kidney transplantation.

Methods: Our study included residents of Minnesota (age older than 18 y) who underwent kidney transplantation at a single center between 2010 and 2020.

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We analyzed the Scientific Registry of Transplant Recipients (2004-2022) for primary kidney transplant recipients with HIV who had average immunologic risk and were discharged on tacrolimus/mycophenolate mofetil (with or without corticosteroids). Recipients were grouped by induction type: rabbit antithymocyte globulin (r-ATG, n = 688) and human interleukin-2 receptor antagonist (IL2Ra, n = 467). Kaplan-Meier curves were generated to examine recipient and graft survival by induction type.

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Article Synopsis
  • The study investigates how the type of induction therapy and high-risk viral discordance affect outcomes in kidney transplant recipients over the age of 55.
  • It analyzes data from over 87,000 transplant cases between 2005 and 2022, focusing on three induction types: rabbit antithymocyte globulin (r-ATG), interleukin-2 receptor antagonist (IL-2RA), and alemtuzumab.
  • Results indicate that while induction type didn't impact recipient survival, high-risk Epstein-Barr virus discordance increased mortality, and alemtuzumab was linked to a higher risk of graft loss compared to r-ATG.
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Background: Heart transplantation remains the most definitive therapy for qualified candidates with end-stage heart failure. Concomitant kidney disease is common in this population prompting an increase in simultaneous heart-kidney (SHK) transplantation in recent years. The goal of our study was to explore the effects of the 2018 heart allocation policy (HAP) change on candidate listing characteristics and compare survival rates at 1 y in patients that were supported with a left ventricular assist device (LVAD) pretransplant and underwent SHK or heart alone transplant (HAT).

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Article Synopsis
  • * This study evaluates whether combining plasmapheresis with rituximab can effectively prevent the recurrence of FSGS in kidney transplant patients.
  • * The combination therapy aims to offer a new treatment approach for recurrent FSGS, which currently has limited options and lacks standardized guidelines.
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Background: The HIV Organ Policy Equity (HOPE) act afforded transplantation of organs from donors who have HIV. Herein we compared the long-term outcomes of recipients with HIV by donor HIV testing status.

Methods: Using the Scientific Registry of Transplant Recipients, we identified all primary adult kidney transplant recipients who were HIV-positive between 1/1/16-12/31/21.

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Background: We examined the association between induction type for a second kidney transplant in dialysis-dependent recipients and the long-term outcomes.

Methods: Using the Scientific Registry of Transplant Recipients, we identified all second kidney transplant recipients who returned to dialysis before re-transplantation. Exclusion criteria included: missing, unusual, or no-induction regimens, maintenance regimens other than tacrolimus and mycophenolate, and positive crossmatch status.

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Using the Scientific Registry of Transplant Recipients, we examined the association between donor-recipient biologic relationship and long-term recipient and allograft survival among glomerulonephritis (GN) patients. Four GN types were studied: membranous nephropathy, IgA, lupus-associated nephritis, and focal segmental glomerulosclerosis (FSGS). We identified all adult primary living-donor recipients between 2000 and 2018 ( = 19,668): related ( = 10,437); unrelated ( = 9,231).

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Background: The use of temporary mechanical circulatory support (tMCS) devices (intra-aortic balloon pump; Impella 2.5, CP, 5.0; venoarterial extracorporeal membrane oxygenation) increased significantly across the United States for heart transplant candidates after the allocation policy change.

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Unlabelled: Long-term outcome data by induction type in simultaneous pancreas-kidney (SPK) is limited.

Methods: Utilizing the Scientific Registry of Transplant Recipients, we examined all primary SPK transplants between 2000 and 2020, excluding crossmatch-positive recipients. We grouped recipients according to induction regimen into 3 groups: rabbit anti-thymocyte globulin (r-ATG) (n = 5678), alemtuzumab (n = 1199), and interleukin-2 receptor antagonist (IL-2RA; n = 1593).

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Background: The role of induction in preemptive second kidney recipients is unclear. We examined the association between induction therapy and the long-term graft and recipient survival in the settings of tacrolimus and mycophenolate maintenance.

Methods: We identified all preemptive second kidney transplant recipients between 2000 and 2020 in the Scientific Registry of Transplant Recipients.

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Background: Steroid avoidance in kidney transplantation has been proven noninferior. Long-term outcome data on steroid avoidance in simultaneous pancreas-kidney (SPK) remains scant.

Methods: Utilizing the Scientific Registry of Transplant Recipients between 2000 and 2020, we studied all primary crossmatch negative SPK recipients (N = 5683) who received antithymocyte globulin induction and were discharged alive with functioning grafts on tacrolimus and mycophenolate ± steroid maintenance.

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. Solid organ transplant graft-versus-host disease (SOT-GVHD) is a rare phenomenon in which recipients of solid organ transplant develop GVHD due to the presence of donor lymphocytes in the graft. SOT-GVHD most often occurs in patients receiving small bowel or liver transplants.

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The long-term outcomes of positive crossmatch (+XM) simultaneous liver-kidney (SLK) transplantations are conflicting. We examined the association between crossmatch status and SLK outcomes in recipients discharged on tacrolimus and mycophenolate with or without steroids. We analyzed the Scientific Registry of Transplant Recipients for all primary SLK recipients between 2003 and 2020 with available crossmatch and induction data.

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There are several choices for induction immunosuppression in kidney-after-liver transplantation. We used the Scientific Registry of Transplant Recipients database. We assessed all kidney-after-liver transplant recipients in the United States between 1/1/2000 and 7/31/2017 to study kidney graft and patient outcomes by induction type.

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Background: Induction choices for kidney-after-heart transplant recipients are variable. We examined the impact of kidney induction types on kidney graft and patient survival in heart transplant recipients.

Methods: We analyzed the Scientific Registry of Transplant Recipient database from inception through the end of 2018 to study kidney and patient outcomes in the United States after heart transplantation.

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Objective: We examined the association between induction type and outcomes of live-donor pediatric kidney recipients on tacrolimus and mycophenolate maintenance.

Material And Methods: We analyzed the SRTR standard analysis file to evaluate primary live-donor pediatric kidney recipients between 2000 and 2018. Recipients were grouped by induction type into three groups: alemtuzumab n = 289, anti-thymocyte n = 1197, and IL-2RA n = 1625.

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Background: We studied the association of induction immunosuppression and pediatric deceased-donor kidney recipient and graft survival.

Methods: We utilized the SRTR to evaluate all primary pediatric deceased-donor kidney transplants from January 1st, 2000, through December 2018. We included only recipients who were maintained on tacrolimus and mycophenolate.

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Particularly large acetaminophen overdoses, termed massive, create a therapeutic challenge given the standardized, N-acetylcysteine-based treatment. One consideration in addition to N-acetylcysteine is the initiation of hemodialysis due to the dialyzable nature of acetaminophen, though encumbered by the concurrent removal of the antidote, N-acetylcysteine. Such cases of large acetaminophen overdose, along with possible concomitant ingestions of other drugs or inactive ingredients, can be complicated by challenging-to-interpret clinical signs and laboratory findings.

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Unlabelled: Complications associated with bladder-drained pancreata necessitating enteric conversion are common. Data on the outcomes after enteric conversion are conflicting. We studied the association between enteric conversion and the pancreas graft rejection, loss, and mortality.

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Background: Induction immunosuppression regimens for kidney transplants in lung transplant recipients vary widely. We studied the impact of induction types for kidney after lung transplant recipients.

Methods: Using the Scientific Registry of Transplant Recipients database between 1994 and 2015, we studied outcomes of patients and kidney grafts for 330 kidney after lung transplant recipients for whom induction before kidney transplant included depletional (n = 115), non-depletional (n = 170), or no induction (steroids only; n = 45).

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In the general population, obesity is associated with an increased risk of developing hypertension (HTN), type 2 diabetes mellitus (DM), and end-stage renal disease (ESRD). Therefore, most transplant centers have a body mass index (BMI) threshold for accepting living kidney donors. But there have been no studies of postdonation weight gain trends and any associated risks.

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