Publications by authors named "Ma Posadas Salas"

Background: The outcome disparities for African American recipients of kidney transplant is a public health issue that has plagued the field of transplant since its inception. Based on national data, African American recipients have nearly twice the risk of graft loss at 5 years after transplant, when compared with White recipients. Evidence demonstrates that medication nonadherence and high tacrolimus variability substantially impact graft outcomes and racial disparities, most notably late (>2 years) after the transplant.

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Background: Optimizing long-term graft survival remains a major focus in transplant. Elderly kidney transplant recipients are vulnerable to acute kidney injury (AKI) and graft loss. This study assessed the safety and efficacy of ACEI/ARB in elderly kidney transplant recipients and impact on graft outcomes.

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Aim: Kidney transplant recipients (KTRs), due to their immunosuppressed status, are potentially more susceptible to both the severe effects of COVID-19 and complications in their transplanted organ. The aim of this study is to investigate whether COVID-19 infection increases the risk of rejection in kidney transplant recipients (KTRs).

Methods: This study involved a detailed literature review, conducted using PubMed, with the search being completed by September 7th, 2023.

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BK viral infection remains to be a challenging post-transplant infection, which can result in kidney dysfunction. The mainstay approach to BK infection is reduction of immunosuppression. Alterations in immunosuppressive regimen with minimization of calcineurin inhibitors, use of mechanistic target of rapamycin inhibitors, and leflunomide have been attempted with variable outcomes.

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Background: Medication safety issues have detrimental implications on long-term outcomes in the high-risk kidney transplant (KTX) population. Medication errors, adverse drug events, and medication nonadherence are important and modifiable mechanisms of graft loss.

Objective: To describe the frequency and types of interventions made during a pharmacist-led, mobile health-based intervention in KTX recipients and the impact on patient risk levels.

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Background: Non-adherence is an important aspect of transplantation that affect outcomes. This study aims to investigate the impact of non-adherence to laboratory and clinic appointments on medication non-adherence and outcomes in kidney transplant (KT) recipients.

Methods: We analyzed KT recipients between 2005-14 with a detailed review of the medical records for non-adherence to laboratory and clinic appointments, as well as medication regimens.

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Background And Objectives: Medication safety events are predominant contributors to suboptimal graft outcomes in kidney transplant recipients. The goal of this study was to examine the efficacy of improving medication safety through a pharmacist-led, mobile health-based intervention.

Design, Setting, Participants, & Measurements: This was a 12-month, single-center, prospective, parallel, two-arm, single-blind, randomized controlled trial.

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The appropriate immunosuppressive regimen in kidney transplant recipients with severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2/COVID-19) infection remains unclear. The impact of direct virus injury complicated by dysregulated hyperimmune response with overwhelming release of various cytokines in COVID-19 infected subjects contributes to the complexity of management. The largest concern of the practicing clinicians at current time is how to tailor maintenance immune-modulating therapy during active viral infection and the efficacy of the soon-to-be upcoming immunization for COVID-19.

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Background: Immunosuppressive regimens are delivered without direct measure of the net state of immunosuppression. Besides therapeutic drug monitoring, adjustments in immunosuppressive medications are largely event-driven.

Methods: We studied the clinical phenotype of immunosuppression reduction (ISR) among kidney transplant recipients from 2005 to 2012.

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Background: The formal recommendation for converting twice-daily tacrolimus immediate release (IR) to once-daily tacrolimus extended release (ER) is a 1:1 dose conversion. However, more recent clinical analysis has shown that this may not be true; some patients may require a higher dose. In addition, de novo dosing tacrolimus ER has revealed that African Americans require approximately 20%-30% higher doses than Caucasians to achieve similar levels.

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Article Synopsis
  • Cytomegalovirus (CMV) is the most common viral infection in organ transplant recipients, often affecting organs like the brain and lungs, but renal involvement is rare.
  • This study presents six cases of biopsy-proven CMV renal infection, with five patients showing detectable CMV viremia.
  • Four patients had improved kidney function after treatment, making this the largest case series of confirmed CMV renal infection from one center.
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Background: Low tacrolimus concentrations have been associated with higher risk of acute rejection, particularly within African American (AA) kidney transplant recipients; little is known about intrapatient tacrolimus variabilities impact on racial disparities.

Methods: Ten year, single-center, longitudinal cohort study of kidney recipients. Intrapatient tacrolimus variability was assessed using the coefficient of variation (CV) measured between 1 month posttransplant and the clinical event, with a comparable period assessed in those without events.

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Aim: To compare the impact of tacrolimus (FK) and cyclosporine (CYA) on acute rejection and graft survival and to assess the predominant causes of graft loss between patients receiving these two calcineurin inhibitors (CNIs).

Methods: Retrospective review of 1835 patients who received a kidney transplant (KTX) between 1999-2012. Patients were grouped based on initial CNI utilized: 1195 in FK group, 640 in CYA group.

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Adherence to immunosuppression and minimizing variability in drug exposure are important considerations in preventing rejection and maximizing overall transplant outcomes. The availability of once-daily tacrolimus may confer potential benefit by simplifying immunosuppressive regimens, thereby improving medication adherence among transplant recipients. Pharmacokinetic studies in healthy normal volunteers and stable transplant recipients suggest that once-daily tacrolimus is bioequivalent to twice-daily tacrolimus.

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Background: Cytomegalovirus (CMV) infection is one of the most common and important opportunistic infections following kidney transplantation. It causes significant morbidity and mortality. Valganciclovir (VGCV) is the drug of choice for prophylaxis to prevent CMV infection.

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