Adherence to multidisciplinary care in a prospective chronic kidney disease cohort is associated with better outcomes.

INTRODUCTION: The Renal Healthcare Program Uruguay (NRHP-UY) is a national, multidisciplinary program that provides care to chronic kidney disease (CKD) patients. In this study, we report the global results of CKD patient outcomes and a comparison between those treated at the NRHP-UY Units, with those patients who were initially included in the program but did not adhere to follow up. METHODS: A cohort of not-on dialysis CKD patients included prospectively in the NRHP-UY between October 1st 2004 and September 30th 2017 was followed-up until September 30th 2019. Two groups were compared: a) Nephrocare Group: Patients who had at least one clinic visit during the first year on NRHP-UY (n = 11174) and b) Non-adherent Group: Patients who were informed and accepted to be included but had no subsequent data registered after admission (n = 3485). The study was approved by the Ethics Committee and all patients signed an informed consent. Outcomes were studied with Logistic and Cox´s regression analysis, Fine and Gray competitive risk and propensity-score matching tests. RESULTS: 14659 patients were analyzed, median age 70 (60-77) years, 56.9% male. The Nephrocare Group showed improved achievement of therapeutic goals, ESKD was more frequent (HR 2.081, CI 95%1.722-2.514) as planned kidney replacement therapy (KRT) start (OR 2.494, CI95% 1.591-3.910), but mortality and the combined event (death and ESKD) were less frequent (HR 0.671, CI95% 0.628-0.717 and 0.777, CI95% 0.731-0.827) (p = 0.000) compared to the Non-adherent group. Results were similar in the propensity-matched group: ESKD (HR 2.041, CI95% 1.643-2.534); planned kidney replacement therapy (KRT) start (OR 2.191, CI95% 1.322-3.631) death (HR 0.692, CI95% 0.637-0.753); combined event (HR 0.801, CI95% 0.742-0.865) (p = 0.000). CONCLUSION: Multidisciplinary care within the NRHP-UY is associated with timely initiation of KRT and lower mortality in single outcomes, combined analysis, and propensity-matched analysis.

Poliquistosis renal autosómica dominante: ¿quiénes se benefician del tratamiento con tolvaptán?. Estado del arte / Autosomal dominant polycystic kidney disease. Who can benefit from tolvaptan therapy? State of the art / Doença renal policística autossômica dominante: quem se beneficia do tratamento com tolvaptano? Estado da arte

Resumen: La poliquistosis renal autosómica dominante es la enfermedad renal hereditaria más frecuente. Se caracteriza por la progresiva aparición de quistes renales que suelen conducir a la enfermedad renal crónica extrema en la edad adulta. La aprobación del uso de tolvaptán (antagonista del receptor V2 de la vasopresina) ha marcado un cambio significativo en el tratamiento de esta enfermedad. En los últimos años apareció evidencia que demuestra el beneficio en iniciar tratamiento con tolvaptán en pacientes que presentan una enfermedad con rápida evolución. Se realiza una revisión descriptiva de los principales estudios clínicos publicados en el periodo 2012-2022 y se sugiere un esquema de utilidad para seleccionar aquellos pacientes que pueden beneficiarse del inicio de tratamiento.

Abstract: Autosomal dominant polycystic kidney disease is the most common hereditary kidney disease. It is characterized by the progressive appearance of renal cysts that usually lead to extreme chronic kidney disease in adulthood. The approval of the use of tolvaptán (V2 vasopressin receptor antagonist) has meant a significant change in the treatment of this disease. In recent years, evidence has proved the benefits of initiating treatment with tolvaptán in patients with a rapidly evolving disease. A descriptive review of the main clinical studies published in 2012-2022 period is carried out and a useful scheme is suggested to select those patients who can benefit from the start of treatment.

Resumo: A doença renal policística autossômica dominante é a doença renal hereditária mais comum. Caracteriza-se pelo aparecimento progressivo de cistos renais que geralmente levam à doença renal crônica extrema na idade adulta. A aprovação do uso do tolvaptano (antagonista do receptor de vasopressina V2) marcou uma mudança significativa no tratamento dessa doença. Nos últimos anos, surgiram evidências que demonstram o benefício de iniciar o tratamento com tolvaptano em pacientes com doença de evolução rápida. Faz-se uma revisão descritiva dos principais estudos clínicos publicados no período 2012-2022 e sugere-se um esquema útil para selecionar aqueles pacientes que podem se beneficiar do início do tratamento.

La oferta de médicos especialistas en Uruguay, 2020. El caso de la nefrología / Medical specialists supply in Uruguay in 2020. A study that focuses on nephrologists / Oferta de médicos especialistas no Uruguai, 2020. O caso da nefrologia

Resumen: Objetivo: estimar la oferta de nefrólogos en Uruguay en 2020. Método: Se plantea analizar las fuentes de información de acceso público como insumo para estimar la oferta de especialistas médicos en Uruguay, su completitud, fiabilidad y limitaciones. Resultados: en 2020, se identifican 178 médicos con desempeño profesional activo en el área de la nefrología en Uruguay. Es una especialidad con una pirámide feminizada (más del 70% son mujeres), y con más de la mitad de los médicos con edades por encima de los 49 años. Si se restringe el universo a los de 65 años o menos, el país cuenta con una oferta de 173 especialistas. Más allá de las limitaciones, es la mejor aproximación a la cantidad y estructura demográfica de la profesión en el país. Conclusiones: el estudio aporta una estimación sobre la oferta de recursos humanos en nefrología. El poder realizar este tipo de trabajo es un avance sustantivo para el Uruguay. La información y los sistemas de información se conciben como un insumo fundamental para el proceso de toma de decisión y gestión en salud. En tal sentido cobra relevancia la optimización del uso de los datos y la información disponible en cada momento, así como la identificación de los datos necesarios y no disponibles, de manera de promover su incorporación en próximas innovaciones de los sistemas de registros sistemáticos de datos.

Abstract: Objective: to estimate nephrologists´ supply in Uruguay in 2020. Method: an analysis of information sources of public access was performed to estimate medical specialists supply in Uruguay, as well as its completeness, reliability and limitations. Results: in 2020, 178 physicians were identified as active nephrology professionals in Uruguay. This area of specialization may be represented as a feminized pyramid, 70% of nephrologists are women and over 50% of them are over 49 years old. If you further restrict these specialists' universe to those who are 65 years old or younger, we find there are 173 medical specialists in Uruguay. Beyond limitations in the method, this is the most accurate survey in terms of the number of nephrologists in the country and the demographic structure of this medical specialization. Conclusions: the study provides an estimation on the human resources supply in nephrology. The ability to conduct this kind of study constitutes a significant progress in Uruguay. Information and information systems are seen as a key input to manage health issues and make decisions in the field of healthcare. As a matter of fact, optimization in the use of data and information available at any time, as well as identifying required data that are not available in order to promote its collection in future innovations of data recording systems is highly relevant.

Resumo: Objetivo: estimar a oferta de nefrologistas no Uruguai no ano de 2020. Método: propor a análise das futuras informações de acesso público como entrada para estimar a oferta de especialistas médicos no Uruguai, sua completitude, fiabilidade e limitações. Resultados: em 2020, foram identificados 178 médicos com desempenho profissional ativo na área da Nefrologia no Uruguai. É uma especialidade com uma pirâmide feminizada - mais de 70% são mulheres, e mais da metade dos médicos com mais de 49 anos. Se este universo for restringido a profissionais com 65 anos ou menos, o país conta com uma oferta de 173 especialistas. Mesmo considerando as limitações, esta é a melhor aproximação à quantidade e estrutura demográfica da profissão no país. Conclusões: o estudo aporta uma estimativa sobre a oferta de recursos humanos em nefrologia. A possibilidade de realizar este tipo de análise é um avanço importante para o Uruguai. A informação e os sistemas de informação são concebidos como um insumo fundamental para o processo de tomada de decisões e o processo de gestão em saúde. Sendo assim, a otimização do uso de dados e informações disponíveis em cada momento, bem como a identificação dos dados necessários e não disponíveis, para promover sua incorporação nas próximas inovações dos sistemas de registros sistemáticos de dados.

Evaluación de las necesidades de recursos humanos en salud: aplicación a la estimación de nefrólogos en Uruguay / Assessing the need for human resources in health: Nephrologist supply forecast in Uruguay / Avaliação das necessidades de recursos humanos em saúde: aplicação à estimativa de nefrologistas no Uruguai

Introducción: mejorar la salud de la población, considerando acceso universal con equidad, requiere de un número de profesionales y una distribución de los mismos adecuada a los problemas de salud de las personas. Las metodologías rigurosas deberían incorporar la identificación de las necesidades en salud para poder cumplir con este principio. Objetivo: estimar estándares de necesidad de nefrólogos para la población de Uruguay en 2020. Método: se conformó un grupo de referentes en nefrología procedentes de la academia y/o Sociedad Científica, se recabaron antecedentes y fuentes de la especialidad vinculadas a los problemas de salud renal en la población. Se definieron un conjunto de supuestos y condiciones iniciales. Se estimó la necesidad de nefrólogos de Uruguay para el año 2020, total del país y por departamento, expresada en valores absolutos y en términos de tasas de profesionales respecto a la población. Se identificaron escenarios alternativos de necesidad a partir de modificaciones de las condiciones iniciales. Resultados: para todo el país la necesidad de nefrólogos se estima entre 139 y 192 profesionales, esto implica una tasa de necesidad en un rango de 39 a 54 por millón de habitantes. Conclusiones: el estudio es el primero en Uruguay en reportar estándares de necesidad de nefrólogos expresados en términos de tasas de especialistas por población en diferentes escenarios definidos a partir de criterios que han sido explicitados y fundamentados.

Introduction: improving the health of populations by means of favoring universal access with equity requires the appropriate number and right distribution of professionals, according to the different health problems people face. Rigorous methodologies should include identification of health requirements in order to comply with this principle. Objective: to estimate the demand for nephrologists in the Uruguayan population in 2020. Method: a group of reference nephrologists - scholars or members of the scientific society - was formed to forecast the demand for these specialists. To that end they reviewed historical data and sources of this field of knowledge that have some connection with kidney diseases in the studied population. Subsequently, a number of assumptions and initial conditions were defined to conduct the study. The demand for nephrologists in Uruguay by 2020 was estimated for the whole country and by department, and it was expressed in absolute values and professional-to-population ratio. Alternative requirement scenarios were identified based on modifications to the initial conditions. Results: the demand for nephrologists is between 139 and 192 professionals, which implies a 39 to 54 per 1 million inhabitants ratio. Conclusions: this is the first one of this kind of studies conducted in Uruguay to report standards for nephrologists requirement in specialists per one million inhabitants, for different scenarios defined based on criteria that have been made explicit and backed.

Introdução: melhorar a saúde da população, considerando o acesso universal com equidade, requer um número de profissionais com uma distribuição adequada aos problemas de saúde das pessoas. Para cumprir este princípio são necessárias metodologias rigorosas que incorporem a identificação das necessidades de saúde. Objetivo: estimar padrões de necessidade de nefrologistas para a população do Uruguai em 2020. Método: formou-se um grupo de referência em nefrologia da academia e/ou Sociedade Científica, que pesquisaram os antecedentes e as fontes da especialidade ligados a problemas de saúde renal na população. Um conjunto de premissas e condições iniciais foi definido. A necessidade de nefrologistas no Uruguai foi estimada para o ano de 2020, para o total do país e por departamento, expressa em valores absolutos e em termos de proporção de profissionais para a população. Cenários alternativos de necessidade foram identificados com base em modificações das condições iniciais. Resultados: para todo o país, a necessidade de nefrologistas está entre 139 e 192 profissionais, o que implica uma taxa de necessidade na faixa de 39 a 54 por milhão de habitantes. Conclusões: o estudo é o primeiro no Uruguai a relatar padrões de necessidade de nefrologistas expressos em termos de taxas de especialistas por população, em diferentes cenários definidos com base em critérios explicados e fundamentados.

Mineral and bone disorder and longterm survival in a chronic kidney disease grade 3b-4cohort.

Mineral and bone disorder biomarkers 'normal ranges' are controversial. The aim of the study was to evaluate the association between serum calcium (Ca), phosphate (P), intact parathyroid hormone (iPTH), and 25(OH) vitamin D levels and mortality risk, in a chronic kidney disease (CKD) grade (G) 3b-4 cohort. The Uruguayan National Renal Healthcare Program (NRHP-UY) CKD patients' cohort, included between 1 October 2004 and 1 March 2020 and followed-up until 1 March 2021, was analyzed with the Ethics Committee approval. A total of 6473 patients were analyzed: 56% men, median age 73 (65-79) years, 55% on CKD G3b. At the end of the follow-up, 2459 (37.7%) patients had died (6.4/100 patient-year). There were iPTH data on 2013 patients (younger, with lower estimated glomerular filtration rate (eGFR) and lesser comorbidities). By bivariate Cox analysis the lowest death risk was observed with mean Ca between 9.01 and 10.25 mg/dl, P between 2.76 and 4.0 mg/dl, iPTH ≤ 105 pg/ml, and 25(OH) vitamin D >10 ng/ml. The multivariate Cox regression mortality risk adjusted to age, sex, CKD etiology, diabetes, smoking, cardiovascular comorbidity, blood pressure, proteinuria, eGFR, renin-angiotensin system blockers and vitamin D treatments, serum Ca, P, iPTH, and 25(OH) vitamin D (n = 964) showed that a higher mortality risk was associated with p > 4.00 mg/dl (HR 1.668, CI 95%: 1.201-2.317), iPTH >105 pg/ml (HR 1.386, CI 95%: 1.012-1.989), and 25(OH) vitamin D ≤ 10 ng/ml (HR 1.958, CI 95%: 1.238-3.098) and a lower mortality risk with 1,25(OH)2 vitamin D treatment (HR 0.639, CI 95%: 0.451-0.906). These data may contribute to the precise G3b-4 CKD-MBD biomarkers levels definition.

Proyección de brecha de especialistas en nefrología en Uruguay 2020-2050: aplicación de un modelo de dinámica de sistemas

Objetivo Estimar el equilibrio/desequilibrio entre la oferta y la necesidad de nefrólogos en Uruguay para el año 2020 así como la tendencia hacia el 2050. Métodos Se desarrolló un modelo de simulación, aplicando la metodología de dinámica de sistemas con dos componentes: el de oferta y el de necesidad. Se definió 2020 como el año base y un horizonte de proyección hasta 2050. Se comparó la oferta y la necesidad en el periodo de proyección para establecer la brecha tanto en términos absolutos como relativos. Resultados La proyección de brecha para todos los escenarios considerados es de superávit en la mayor parte del periodo analizado. Conclusiones El trabajo aporta insumos respecto de aquellos parámetros sobre los que se puede incidir y que afectan a la oferta de especialistas. El valor de las proyecciones radica en su utilidad para identificar la situación actual y las tendencias futuras a las que deben responder los responsables de la formulación de políticas.

Objective To estimate the balance/imbalance between supply and demand of nefrologists in Uruguay for the year 2020, adding its tendency towards 2050. Methods A simulation model was developed, applying a two dynamic systems methodology with two components: that of supply and that of need. The base year was defined as 2020 with a projection horizon up to 2050. Supply and need were compared for the projection period to establish the gap, both in relative and absolute terms. Results The projection gap for all considered scenarios is that of surplus for most of the analyzed period. Conclusions This work offers input with respect of impactful parameters that affect healthcare specialists supply. The key value of the projections lies in its utility to identify the current situation and its future tendencies, to which those responsible for policy making have to respond.

Tobacco Use and the Kidney: A Review of Public Policies and Studies on Kidney Disease Progression.

Clinical Background: Cigarette smoking is one of the leading causes of preventable deaths, including cardiovascular diseases and cancer. However, the effects of tobacco use on chronic kidney disease (CKD) are less widespread. Epidemiology: Smoking tobacco is associated with proteinuria and attenuation of glomerular filtration rate in the general population of different ethnicities. Smoking also accelerates the progression of established CKD and aggravates proteinuria along the wide spectrum of causes determining kidney disease. Furthermore, smoking worsens the survival of kidney transplant recipients and shortens graft survival. Most of the effects of tobacco exposure are dose and time dependent and could be ameliorated with smoking cessation. Challenges: In the last decades, tobacco use policies and regulations were implemented around the world obtaining a global 6% reduction in smoking prevalence. However, the reduction was not proportionally equal in all the geographical areas around the world. The region of Americas experimented the most positive result in reducing smoking prevalence. Smoking trends in South East Asian and Eastern Mediterranean regions show minor decrease or increased rates. The World Health Organization projected reaching a global target prevalence of 15% by 2025. Prevention and Treatment: The results showing smoking cessation slows the progression of kidney disease in smokers should drive our effort to help our patients quit smoking. Smoking prevention at the population level, and particularly in those at risk of CKD or with established CKD should be part of health policies and regulations all around the world.

Recomendaciones sobre la vacunación contra SARS-CoV-2 / COVID-19 en pacientes con enfermedad renal y trasplante renal / Recommendations for the SARS-CoV-2 vaccination of patients with kidney disease and transplant recipients / Recomendações sobre vacinação contra SARS-CoV-2 / COVID-19 em pacientes com doença renal e transplante renal

Resumen: Este documento de recomendaciones tiene como objetivo orientar a médicos nefrólogos y no nefrólogos que asisten a pacientes con enfermedad renal crónica (ERC) en todas las etapas de la misma, en el proceso de vacunación contra el SARS-CoV-2. Como consecuencia de la situación epidemiológica y de los tiempos del proceso de elaboración de las vacunas disponibles, no se ha generado evidencia lo suficientemente potente, por lo que las recomendaciones no se acompañan del nivel de evidencia. Se fundamenta la necesidad de priorizar la vacunación en este grupo de pacientes en el mayor riesgo de adquirir la infección por SARS-CoV-2, desarrollar la enfermedad COVID-19 con mayor gravedad y presentar una mortalidad más elevada que la población general. Las recomendaciones se organizan por grupos de pacientes considerando pacientes con ERC no dialítica, diálisis y trasplante renal, y pacientes bajo tratamiento inmunosupresor.

Summary The objective of this document containing recommendations is to provide guidelines for nephrologists and non-nephrologists who assist patients with chronic kidney disease (CKD) at all stages of the disease on the vaccination process against SARS-CoV-2. As a consequence of the current epidemiological situation and the timing of the COVID-19 vaccine development -for available vaccines- there is no solid evidence, and thus, recommendations are not accompanied by the due medical proof. The need to prioritize vaccination in this group of patients is based on the increased risk of acquiring the SARS-CoV-2 infection, developing the COVID-19 disease with greater severity and presenting higher mortality rates than the general population. The recommendations are organized by groups of patients, considering patients with non-dialytic CKD, dialysis and kidney transplantation, and patients under immunosuppressive treatment.

Resumo: O objetivo deste documento de recomendações é orientar os nefrologistas e não nefrologistas que atendem pacientes com doença renal crônica (DRC) em todas as fases da doença, no processo de vacinação contra a SARS-CoV-2. Como consequência da situação epidemiológica e do momento do processo de produção das vacinas disponíveis, não foram geradas evidências suficientemente potentes, de modo que as recomendações não são acompanhadas de seu nível de evidência. A necessidade de priorizar a vacinação neste grupo de pacientes baseia-se no maior risco de adquirir a infecção pelo SARS-CoV-2, desenvolver a doença COVID-19 com maior gravidade e apresentar mortalidade superior à da população em geral. As recomendações são organizadas por grupos de pacientes, considerando pacientes com DRC não dialítica, em diálise, com transplante renal, e pacientes em tratamento imunossupressor.

Recertificación médica en Uruguay: múltiples miradas de una obligación impostergable / Medical recertification in Uruguay: multiple perspectives of an imperative need / Recertificação médica no Uruguai: múltiplas visões de uma obrigação urgente

Resumen: La recertificación es el resultado de un acto por el que una entidad legalmente acreditada, asegura que el profesional médico (previamente certificado) mantiene actualizados sus conocimientos y destrezas, y que ha desarrollado su actividad dentro del marco ético y científico adecuado al progreso del "saber" y del "hacer" propio de su especialidad. A pesar de un largo camino recorrido, en Uruguay no se ha podido establecer un proceso de recertificación universal. Múltiples actores (usuarios del sistema, médicos, Facultad de Medicina, programas de Desarrollo Profesional Médico Continuo) consideran que es una necesidad, sin embargo es necesario vencer algunas barreras para que se establezca un programa de recertificación. Se recorren algunos de estos aspectos en este documento, desarrollados en el contexto de un grupo de trabajo para el Congreso por los 100 años del Sindicato Médico del Uruguay.

Abstract: Recertification is the result of an act by which a legally accredited entity ensures that medical professionals (previously certified) keep their knowledge and skills up to date, and that they have practiced their profession within the ethical and scientific framework that regulates the process that evolves from "knowing" to "knowing how" in their areas of specialization. Despite a long journey in Uruguay, it has not been possible to establish a universal recertification process. Multiple actors (system users, doctors, the School of Medicine, Continuing Medical Professional Development programs) regard it as a need, although some barriers must be overcome in order to define a recertification program. This document covers a few of these aspects and is the result of a working group created for the Congress held in commemoration of the 100 years of the Uruguayan Medical Association.

Resumo: A recertificação é o resultado de um ato pelo qual uma entidade legalmente credenciada garante que o profissional médico (previamente certificado) mantém os seus conhecimentos e competências atualizados, e que desenvolveu a sua atividade dentro do quadro ético e científico adequado ao progresso do "conhecimento" e o "fazer" da sua especialidade. Apesar do longo caminho percorrido no Uruguai, ainda não foi possível estabelecer um processo de recertificação universal. Múltiplos atores (usuários do sistema, médicos, Faculdade de Medicina, programas de Desenvolvimento Continuado do Profissional Médico) consideram isso uma necessidade, porém é necessário superar algumas barreiras para que um programa de recertificação seja estabelecido. Alguns desses aspectos são abordados neste documento, desenvolvido no contexto de um grupo de trabalho para o Congresso pelos 100 anos do Sindicato Médico del Uruguay.

Hemodiafiltración en línea como terapia de reemplazo renal crónica. Primera experiencia nacional en el Hospital Universitario / Online haemodiafiltration therapy to treat chronic kidney disease. First national experience in the university hospital / Hemodiafiltração on line como terapia de substituição da função renal crônica. Primeira experiência nacional no hospital universitário

Resumen: La enfermedad renal crónica tiene una prevalencia estimada de 6,5% a 8% en los adultos mayores de 18 años en Uruguay. A pesar de los esfuerzos por realizar un diagnóstico temprano y retrasar su progresión un porcentaje de pacientes requiere terapia de reemplazo renal (TRR) mediante diálisis, con una tasa de incidencia anual de 166 pacientes/millón de población. A pesar de las mejoras en el cuidado nefrológico y en las técnicas de hemodiálisis, la mortalidad anual de los pacientes en esta técnica es elevada en nuestro país (16,5%) y en todo el mundo. Con el objetivo de mejorar estos aspectos se han ensayado técnicas dialíticas que asocian la convección como estrategia para depurar moléculas de mayor tamaño que habitualmente no se depuran en la hemodiálisis convencional. La hemodiafiltración en línea (HDF-OL) es una técnica convectiva. Cuando se utiliza como TRR crónica se asocia a una reducción de la mortalidad de 30%-35% comparada con la hemodiálisis convencional. En el año 2014 se instrumentó esta técnica en el Hospital de Clínicas, siendo el centro pionero en el país en contar con ella como TRR crónico. El proceso de implementación implicó cambios de la infraestructura (monitores de diálisis, centro de tratamiento del agua), formación de recursos humanos, cambios en el funcionamiento y controles microbiológicos programados. El control de calidad sistemático y los diferentes estudios realizados en este período de cinco años han mostrado que es una técnica segura, capaz de remover solutos de tamaño medio y de disminuir los requerimientos de eritropoyetina. No se encuentra aún financiada por el sistema de salud, lo que puede constituir una barrera en su difusión a nivel nacional. En el presente trabajo se revisan las características fundamentales de la hemodiafiltración, su beneficio comparado con la hemodiálisis convencional, y el proceso de implementación de la técnica junto con algunos resultados iniciales en el Hospital de Clínicas.

Summary: Chronic kidney disease has an estimated prevalence of 6.5% to 8% in adults older than 18 years old in Uruguay. Despite efforts to make an early diagnosis and delay its progression, a percentage of patients require renal replacement therapy (RRT) with dialysis, the annual incidence rate being 166 patients per million population. Regardless of improvements in nephrology care and hemodialysis techniques, annual mortality ratex for this technique is high in our country (16.5%) and around the world. In order to improve these aspects, different dialysis techniques associating convection as a strategy to purify larger molecules that are rarely purified in conventional hemodialysis have been tried out. Online haemodiafiltration (OL-HDF) is a convective technique. When used as a chronic RRT it is associated to a 30-35% reduction in mortality compared to conventional hemodialysis. In 2014 this technique was introduced in the University Hospital, being it the first center that offered it as chronic renal replacement therapy. The implementation process implied changes in infrastructure (dialysis computer screens, water treatment center), the training of human resources, changes in the operation system and programmed microbiological controls. A systematic quality control and the different studies conducted in this 5-year period have proved it is a safe technique that removes average size solutes and reduces the erythropoietin requirements. This technique is still not funded by the health system, what may result in an obstacle for it to be applied nationally. This study reviews the main features of haemodiafiltration, its benefits when compared to conventional hemodialysis and the process needed to implement the technique, along with initial results in the University Hospital.

Resumo: No Uruguai a doença renal crônica tem uma prevalência estimada de 6.5 a 8% nos adultos maiores de 18 anos. Apesar dos esforços para realizar um diagnóstico precoce e retardar sua progressão uma porcentagem de pacientes requer terapia de substituição da função renal (TSFR) mediante diálise, com uma taxa de incidência anual de 166 pacientes/milhão de habitantes. Independentemente das melhorias na atenção nefrológica e nas técnicas de hemodiálise, a mortalidade anual dos pacientes em tratamento com esta técnica é elevada no Uruguai (16.5%) e no mundo todo. Buscando melhorar esses aspectos foram ensaiadas varias técnicas dialíticas que associam a convecção como estratégia para depurar moléculas de maior tamanho que habitualmente não são depuradas na hemodiálise convencional. A hemodiafiltração on line (HDF-OL) é uma técnica convectiva. Quando é utilizada como TSFR crônica está associada a uma redução da mortalidade de 30-35% comparada com a hemodiálise convencional. Esta técnica foi instrumentada em 2014 no Hospital de Clínicas, sendo este o centro pioneiro no Uruguai em utilizá-la como TSFR crônico. O processo de implementação impôs mudanças na infraestrutura (monitores de diálise, centro de tratamento da água), formação de Recursos Humanos e mudanças no funcionamento e controles microbiológicos programados. O controle de qualidade sistemático e os diferentes estudos realizados neste período de 5 anos mostraram que é uma técnica segura, capaz de remover solutos de tamanho médio e de reduzir os requerimentos de eritropoietina. A atual falta de financiamento pelo sistema de saúde pode ser uma barreira para sua difusão no país. Neste trabalho faz-se uma revisão das características fundamentais da hemodiafiltração, seu beneficio comparado com a hemodiálise convencional, o processo de implementação da técnica e alguns resultados iniciais do Hospital de Clínicas.

Substitution of Oral for Intravenous Cyclophosphamide in Membranous Nephropathy.

Background: Optimal immunosuppressive treatment for membranous nephropathy is still a matter of controversy. Current recommendations include oral cyclophosphamide combined with steroids (modified Ponticelli regimen) as first-line treatment in patients who are high risk. However, concerns about the cumulative toxicity of oral cyclophosphamide persist. In the last 30 years, a protocol based on low-dose intravenous cyclophosphamide plus steroids has been used to treat membranous nephropathy in Uruguay. We aimed to assess the efficacy of this regimen to induce clinical remission in patients with membranous nephropathy. Methods: In this retrospective, observational cohort study, we analyzed the outcome of 55 patients with membranous nephropathy treated between 1990 and 2017 with a 6-month course of alternating steroids (months 1, 3, and 5) plus intravenous cyclophosphamide (single dose of 15 mg/kg on the first day of months 2, 4, and 6). Results: At 24 months, 39 (71%) patients achieved clinical response with complete remission observed in 23 patients (42%) and partial remission in 16 (29%). Median time to achieve partial and complete remission was 5.9 and 11.5 months, respectively. Absence of response was observed in 16 patients (29%), five of whom started chronic RRT after a median follow-up of 3.5 years. Clinical relapse occurred in nine of 33 (27%) patients at a median of 34 months after treatment discontinuation. Conclusions: Replacement of oral cyclophosphamide with a single intravenous pulse on months 2, 4, and 6 of the modified Ponticelli regimen can be an effective and safe alternative for treatment of membranous nephropathy. Podcast: This article contains a podcast at https://www.asn-online.org/media/podcast/K360/2020_09_24_KID0002802020.mp3.

Is Chronic Kidney Disease Progression Influenced by the Type of Renin-Angiotensin-System Blocker Used?

INTRODUCTION: Angiotensin-converting enzyme inhibitors (ACEIs) and angiotensin receptor blockers (ARBs) reduce proteinuria and slow renal disease progression more effectively than other therapies in patients with chronic kidney disease (CKD). However, differences regarding efficacy and safety between these therapies remain controversial. OBJECTIVES: Aim of this study was to analyze the different treatment effect of ACEI, ARB, and non-ACEI/ARB in CKD progression. The primary outcome was survival to end-stage renal disease (ESRD) and/or death and to ESRD censored by all-cause death, secondary outcomes were proteinuria reduction and hyperkalemia. METHODS: We analyzed data from 1,120 patients extracted from the National Renal Healthcare Program cohort, which included 17,238 CKD nondialysis subjects who were successively monitored between -September 1, 2004 and August 31, 2016. Inclusion criteria were at least a 1-year follow-up, 3 clinical visits, and no previous treatment with ACEI or ARB. From the baseline visit onward, patients continued with 3 different treatment schemes: no ACEI/ARB, started on ACEI or ARB, but while avoiding both treatments in combination. Chi2, t test, binary logistic regression, and multivariate regression models (Cox proportional Hazard model and competing risk Fine and Gray model were used for statistical analysis. RESULTS: Mean age and follow-up were 67.9 (± 15) and 3.8 (± 2) years, respectively. Estimated glomerular filtration rate averaged 42.1 ± 23 mL/min/1.73 m2 and 300 (27%) patients were diabetics. Progression to ESRD was significantly worse in the no ACEI/ARB group (hazard ratio [HR] 4.23, 95% CI 1.28-13.92) versus ACEI (reference group; p = 0.01). The analysis by competing-risks' regression showed significantly higher risk of ESRD in the no ACEI/ARB group (HR 3.63, 95% CI 1.34-9.85) versus ACEI (p = 0.01). There were no significant differences between ACEI and ARB groups (HR 1.31, 95% CI 0.37-4.66) regarding the risk of progression to ESRD. Survival was similar in all 3 groups (p = 0.051). Statistically significantly more patients experienced reductions in proteinuria/albuminuria in ACEI and ARB groups (together) versus no ACEI/ARB group (p = 0.016, OR 1.82, 95% CI 1.12-2.94). No difference in hyperkalemia frequency was found between them (p = 0.17). CONCLUSIONS: In patients with CKD, treatment with ACEI or ARB had a superior effect than no ACEI or ARB treatment on slowing kidney disease progression and on proteinuria reduction. Efficacy of ACEI and ARB was comparable.

Lupus Nephritis in Males: Clinical Features, Course, and Prognostic Factors for End-Stage Renal Disease.

INTRODUCTION: Because of their rarity in men, systemic lupus erythematous and lupus nephritis (LN) are poorly understood in men. Our aim was to analyze the clinical presentation and course of histology-proven systemic lupus erythematous and LN in males and to determine the risk factors for progression to end-stage renal disease. METHODS: Fifty patients from 2 historical cohorts in Spain (Hospital 12 de Octubre) and Uruguay were retrospectively analyzed and compared with a female cohort matched for age and disease characteristics. RESULTS: The median age at the time of renal biopsy was 27 years (range, 8-79 years). The main forms of presentation were nephrotic syndrome in 26 of 50 patients (52%), and class IV LN in 34 of 50 (68%). After treatment, 21 patients (45.6%) achieved complete renal remission. During follow-up, 12 patients required renal replacement therapy, and 3 patients died of infectious causes. When patients who required renal replacement therapy were compared with those who did not require it, several parameters showed significant differences (P < 0.05) at the time of renal biopsy: estimated glomerular filtration rate < 60 ml/min, hypertension, hypoalbuminemia, and concomitant visceral involvement (neurologic, cardiovascular, and/or pulmonary). In the multivariate analysis, only estimated glomerular filtration rate < 60 ml/min persisted as a risk factor for progression to end-stage renal disease. When compared with a cohort of female patients with LN, there were no significant differences in remission or renal survival. DISCUSSION: LN in males usually presents as nephrotic syndrome, and type IV LN is the most frequent form. An estimated glomerular filtration rate < 60 ml/min at the time of renal biopsy is associated with poor renal outcomes. There were no differences in remission or progression of LN in males when compared with a cohort of female patients with LN.

Obesidad y Enfermedad Renal Crónica / Obesity and Chronic Kidney Disease / Obesidade e doença renal crônica

Resumen: La obesidad y el sobrepeso son una pandemia. Algo más de la mitad de los adultos de América Latina tiene sobrepeso y uno de cada cuatro es obeso. En Uruguay la situación es también preocupante. Uno de cada dos adultos tiene sobrepeso y uno de cada cinco obesidad. Sobrepeso y obesidad se vinculan al desarrollo y progresión de enfermedad renal crónica. Esto es consecuencia directa de la obesidad a través de factores mecánicos como la hiperfiltración o el aumento de las presiones cavitarias, o por medio de múltiples mediadores endócrinos e inflamatorios regulados por el tejido adiposo. De forma indirecta la obesidad se vincula al desarrollo de factores de riesgo para enfermedad renal como lo son la diabetes mellitus, la hipertensión arterial, la hiperuricemia y el hígado graso no alcohólico. Por último, algunas patologías como la nefrolitiasis y el desarrollo de neoplasias son más frecuentes en el escenario del sobrepeso y la obesidad, y se vinculan al desarrollo de enfermedad renal. Las medidas tendientes al descenso de peso y la incorporación de hábitos saludables se han vinculado a una reducción en la prevalencia y progresión de la enfermedad renal, así como a mejoría de los marcadores de lesión renal como la proteinuria. La inhibición del eje renina-angiotensina-aldosterona es otra medida eficaz tendiente a disminuir la progresión de la enfermedad renal en esta población.

Abstract: Obesity and being overweight are a pandemic. More than half of adults in Latin America are overweight and one in four are obese. In Uruguay, the situation is also worrying. One in two adults is overweight and one in five is obese. Overweight and obesity are linked to the development and progression of chronic kidney disease. This is a direct consequence of obesity through mechanical factors such as hyperfiltration or increased cavitary pressures, or through multiple endocrine and inflammatory mediators regulated by adipose tissue. Indirectly obesity is linked to the development of risk factors for kidney disease such as diabetes mellitus, hypertension, hyperuricemia and non-alcoholic fatty liver. Finally, some pathologies such as nephrolithiasis and the development of neoplasias are more frequent in the scenario of overweight and obesity, and are linked to the development of renal disease. Measures leading to weight loss and the incorporation of healthy habits have been linked to a reduction in the prevalence and progression of renal disease, as well as to an improvement in markers of renal injury such as proteinuria. Inhibition of the renin-angiotensin-aldosterone axis is another effective measure to decrease the progression of renal disease in this population.

Resumo: A obesidade e o excesso de peso são uma pandemia. Mais de metade dos adultos na América Latina estão acima do peso e um em cada quatro é obeso. No Uruguai, a situação também é preocupante. Um em cada dois adultos tem excesso de peso e um em cada cinco é obeso. Sobrepeso e obesidade estão ligados ao desenvolvimento e progressão da doença renal crônica. Esta é uma conseqüência direta da obesidade através de fatores mecânicos como hiperfiltração ou aumento das pressões cavitárias, ou através de múltiplos mediadores endocrinos e inflamatórios regulados pelo tecido adiposo. Indiretamente, a obesidade está ligada ao desenvolvimento de fatores de risco para doenças renais como diabetes mellitus, hipertensão, hiperuricemia e fígado gordo não alcoólico. Finalmente, algumas patologias como nefrolitíase e desenvolvimento de neoplasias são mais freqüentes no cenário de sobrepeso e obesidade e estão ligadas ao desenvolvimento de doença renal. As medidas que levaram à perda de peso e à incorporação de hábitos saudáveis ​​têm sido associadas a uma redução na prevalência e progressão da doença renal, bem como a uma melhora nos marcadores de lesão renal, como a proteinúria. A inibição do eixo renina-angiotensina-aldosterona é outra medida efetiva para diminuir a progressão da doença renal nesta população.