Publications by authors named "Millie Samaniego"

Kidney transplant is not only the best treatment for patients with advanced kidney disease but it also reduces health care expenditure. The management of transplant patients is complex as they require special care by transplant nephrologists who have expertise in assessing transplant candidates, understand immunology and organ rejection, have familiarity with perioperative complications, and have the ability to manage the long-term effects of chronic immunosuppression. This skill set at the intersection of multiple disciplines necessitates additional training in Transplant Nephrology.

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Purpose Of Review: This review will focus on the epidemiological data, risk factors, and management of stroke before and after kidney transplant. Stroke is highly prevalent in waitlisted patients as well as kidney transplant recipients and is associated with impaired transplant outcomes. Multiple traditional, nontraditional, and transplanted risk factors increase the risk of stroke.

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The current American Society of Transplantation (AST) accredited transplant fellowship programs in the United States provide no structured formal training in leadership and administration which is essential for successfully running a transplant program. We conducted a survey of medical directors of active adult kidney and kidney-pancreas transplant programs in the United States about their demographics, training pathways, and roles and responsibilities. The survey was emailed to 183 medical directors, and 123 (67.

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The management of a kidney transplant program has evolved significantly in the last decades to become a highly specialized, multidisciplinary standard of care for end-stage kidney disease. Transplant center job descriptions have similarly morphed with increasing responsibilities to address a more complex patient mix, increasing medical and surgical therapeutic options, and increasing regulatory burden in the face of an ever-increasing organ shortage. Within this evolution, the role of the Kidney Transplant Medical Director (KTMD) has expanded beyond the basic requirements described in the United Network for Organ Sharing bylaws.

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Purpose Of Review: To provide an update of the literature on the use of new biomarkers of rejection in kidney transplant recipients.

Recent Findings: The kidney allograft biopsy is currently considered the gold standard for the diagnosis of rejection. However, the kidney biopsy is invasive and could be indeterminate.

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Background: The updated BANFF 2013 criteria has enabled a more standardized and complete serologic and histopathologic diagnosis of chronic active antibody mediated rejection (cAMR). Little data exists on the outcomes of cAMR since the initiation of this updated criteria.

Methods: 123 consecutive patients with biopsy proven cAMR (BANFF 2013) between 2006 and 2012 were identified.

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Production of de novo donor-specific antibodies (dnDSA) is a major risk factor for acute and chronic antibody-mediated rejection and graft loss after all solid organ transplantation. In this article, we review the data available on the risk of individual immunosuppressive agents and their ability to prevent dnDSA production. Induction therapy with rabbit antithymocyte globulin may achieve a short-term decrease in dnDSA production in moderately sensitized patients.

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Chronic opioid usage (COU) for analgesia is common among patients with end-stage renal disease. In order to test whether a prior history of COU negatively affects post-kidney transplant outcomes, we retrospectively examined clinical outcomes in adult kidney transplant patients. Among 1064 adult kidney transplant patients, 452 (42.

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The benefits of preemptive kidney transplantation are manifold. By avoiding complications associated with dialysis, preemptive kidney transplantation offers significant benefits in terms of patient welfare and societal cost-saving. Patients transplanted preemptively also tend to enjoy better patient and graft survival, especially when done with a living-donor organ.

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Our center started routine monitoring of preformed and de novo human leukocyte antigen donor-specific antibodies (DSA) in September 2010 using single antigen beads on the Luminex platform. Recipients with preformed DSA or other high immunological risk factors had serial DSA monitoring at 3, 6, and 12-months posttransplant, and low-risk recipients were screened only at 12-months. Surveillance biopsies were performed at 3, 6, and 12-months post-transplant for all recipients.

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Pancreas after kidney (PAK) transplantation is one of the accepted pancreas transplant modalities. We studied the impact of time interval between kidney and pancreas transplantation on the outcomes of PAK transplantation. Using OPTN/SRTR data, we included 1853 PAK transplants performed between 1996 and 2005 with follow-up until November 1, 2008.

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Diabetes mellitus (DM) is a common and devastating disease, affecting up to 19.3 million Americans. It is the leading cause of chronic kidney disease (CKD) and end-stage renal disease (ESRD) in the United States.

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Kidney allograft fibrosis results from a reactive process mediated by humoral and cellular events and the activation of transforming growth factor beta1. It is a process that involves both parenchymal and graft infiltrating cells and can lead to organ failure if injury persists or if the response to injury is excessive. In this review, we will address the role of preventive and therapeutic strategies that target kidney allograft fibrogenesis.

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Background: There is no information on the effects of proteinuria on outcomes following rejection.

Methods: We addressed this question in a retrospective study of 925 kidney transplant recipients between January 2003 and December 2007. Selection criteria were based on (i) biopsy proven diagnosis of a first episode of acute rejection, and (ii) available data on urine protein to creatinine (UPC) ratios at baseline (lowest serum creatinine before biopsy), time of biopsy and 1 month after biopsy.

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Over the past 10 years, thanks to the development of sensitive methods of antibody detection and markers of antibody injury such as C4d staining, the role of anti-human leukocyte antigen (HLA) and non-HLA alloantibodies as effectors of acute and chronic immune allograft injury has been revisited. Antibody-mediated rejection (AMR) defines all allograft rejection caused by antibodies directed against donor-specific HLA molecules, blood group antigen (ABO)-isoagglutinins, or endothelial cell antigens. Antibody-mediated rejection can be a recalcitrant process, resistant to therapy and carries an ominous prognosis to the graft.

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Atypical hemolytic uremic syndrome, or the nondiarrheal form of hemolytic uremic syndrome, is a rare disorder typically classified as familial or sporadic. Recent literature has suggested that approximately 50% of patients have mutations in factor H (CFH), factor I (CFI), or membrane cofactor protein (encoded by CD46). Importantly, results of renal transplantation in patients with mutations in either CFH or CFI are dismal, with recurrent disease leading to graft loss in the majority of cases.

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Background: There is little information on the role of bisphosphonates and bone mineral density (BMD) measurements for the follow-up and management of bone loss and fractures in long-term kidney transplant recipients.

Methods: To address this question, we retrospectively studied 554 patients who had two BMD measurements after the first year posttransplant and compared outcomes in patients treated, or not with bisphosphonates between the two BMD assessments. Kaplan-Meier survival and stepwise Cox regression analyses were performed to examine fracture-free survival rates and the risk-factors associated with fractures.

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Background: Disease progression rates and outcomes per stage of kidney disease in kidney transplant recipients with type 1 diabetes mellitus are unknown.

Study Design: Single-center retrospective cohort study.

Settings & Participants: 276 kidney transplant recipients with type 1 diabetes mellitus and a functioning graft at 1 year posttransplantation.

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Background: Kidney half-life and inter-stage progression rates in native chronic kidney disease (CKD) and CKD-transplant (CKD-T) remain unknown.

Methods: We examined stage-to-stage progression/regression rates in patients with CKD (n = 601) and CKD-T (n = 431) between 1991 and 2001. Kidney function was estimated by Cockcroft-Gault and MDRD eGFR formulae.

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Kidney transplantation is the treatment of choice for patients with ESRD. Despite improvements in short-term patient and graft outcomes, there has been no major improvement in long-term outcomes. The use of kidney allografts from expanded-criteria donors, polyoma virus nephropathy, underimmunosuppression, and incomplete functional recovery after rejection episodes may play a role in the lack of improvement in long-term outcomes.

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Kidney transplantation is the treatment of choice for patients with end-stage renal disease, in part because of ongoing efforts towards improving immunosuppressive strategies. Although calcineurin inhibitors remain the mainstay of immunosuppression in kidney transplant recipients, within this class of drug there has been a shift from use of ciclosporin to use of tacrolimus. Mycophenolate mofetil and mycophenolate sodium are now the antimetabolites of choice.

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