Long-term follow-up of an IgA nephropathy cohort: outcomes and risk factors.

AIM: IgA nephropathy (IgAN), the most common glomerulopathy worldwide and in Uruguay, raised treatment controversies. The study aimed to analyze long-term IgAN outcomes and treatment. METHODS: A retrospective analysis of a Uruguayan IgAN cohort, enrolled between 1985 and 2009 and followed up until 2020, was performed. The Ethics Committee approved the study. The inclusion criteria were (a) biopsy-proven IgAN; (b) age ≥12 years; and (c) available clinical, histologic, and treatment data. The patients were divided into two groups, with immunosuppressive (IS) or without (NoIS) treatment. Outcomes (end-stage kidney disease/kidney replacement therapy [ESKD/KRT] or all-cause death) were obtained from mandatory national registries. RESULTS: The study population included 241 patients (64.7% men), median age 32 (19.5) years, baseline blood pressure <130/80 mmHg in 37%, and microhematuria in 67.5% of patients. Baseline proteinuria, glomerulosclerosis, and a higher crescent percentage were significantly more frequent in the IS group. Proteinuria improved in both groups. Renal survival at 20 years was 74.6% without difference between groups. In the overall population and in the NoIS group, bivariate Cox regression analysis showed that baseline proteinuria, endocapillary hypercellularity, tubule interstitial damage, and crescents were associated with a higher risk of ESKD/KRT or death, but in the IS group, proteinuria and endocapillary hypercellularity were not. In the multivariate Cox analysis, proteinuria in the NoIS group, crescents in the IS group and tubule interstitial damage in both groups were independent risk factors. CONCLUSION: The IS group had more severe risk factors than the NoIS group but attained a similar outcome.

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.

[Severe hypokalemic rhabdomyolysis. Report of six cases]. / Rabdomiólisis por hipopotasemia severa.

Rhabdomyolysis results from acute necrosis of skeletal muscle fibers and consequent leakage of muscle constituents into the circulation. It ranges from an asymptomatic state to a severe condition associated with extreme elevations in creatine kinase and acute renal failure. Reported etiologies of rhabdomyolysis include alcohol abuse, drugs, muscle trauma and muscle overexertion. Less common causes include muscle enzyme deficiencies, electrolyte abnormalities, infectious causes, toxins and endocrine disorders. Hypokalemia is a rare cause of rhabdomyolysis. We report six patients aged 31 to 57 years (three women) with a severe hypokalemic rhabdomyolysis, secondary to chronic diarrhea in two patients, treatment with loop diuretics in one and Gitelman syndrome in three. Rhabdomyolysis may be underdiagnosed in the context of hypokalemia, because the neuromuscular symptoms can be attributed solely to the electrolyte disorder.

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.

ISPD recommendations for the evaluation of peritoneal membrane dysfunction in adults: Classification, measurement, interpretation and rationale for intervention.

GUIDELINE 1: A pathophysiological taxonomy: A pathophysiological classification of membrane dysfunction, which provides mechanistic links to functional characteristics, should be used when prescribing individualized dialysis or when planning modality transfer (e.g. to automated peritoneal dialysis (PD) or haemodialysis) in the context of shared and informed decision-making with the person on PD, taking individual circumstances and treatment goals into account. (practice point). GUIDELINE 2A: Identification of fast peritoneal solute transfer rate (PSTR): It is recommended that the PSTR is determined from a 4-h peritoneal equilibration test (PET), using either 2.5%/2.27% or 4.25%/3.86% dextrose/glucose concentration and creatinine as the index solute. (practice point) This should be done early in the course dialysis treatment (between 6 weeks and 12 weeks) (GRADE 1A) and subsequently when clinically indicated. (practice point). GUIDELINE 2B: Clinical implications and mitigation of fast solute transfer: A faster PSTR is associated with lower survival on PD. (GRADE 1A) This risk is in part due to the lower ultrafiltration (UF) and increased net fluid reabsorption that occurs when the PSTR is above the average value. The resulting lower net UF can be avoided by shortening glucose-based exchanges, using a polyglucose solution (icodextrin), and/or prescribing higher glucose concentrations. (GRADE 1A) Compared to glucose, use of icodextrin can translate into improved fluid status and fewer episodes of fluid overload. (GRADE 1A) Use of automated PD and icodextrin may mitigate the mortality risk associated with fast PSTR. (practice point). GUIDELINE 3: Recognizing low UF capacity: This is easy to measure and a valuable screening test. Insufficient UF should be suspected when either (a) the net UF from a 4-h PET is <400 ml (3.86% glucose/4.25% dextrose) or <100 ml (2.27% glucose /2.5% dextrose), (GRADE 1B) and/or (b) the daily UF is insufficient to maintain adequate fluid status. (practice point) Besides membrane dysfunction, low UF capacity can also result from mechanical problems, leaks or increased fluid absorption across the peritoneal membrane not explained by fast PSTR. GUIDELINE 4A: Diagnosing intrinsic membrane dysfunction (manifesting as low osmotic conductance to glucose) as a cause of UF insufficiency: When insufficient UF is suspected, the 4-h PET should be supplemented by measurement of the sodium dip at 1 h using a 3.86% glucose/4.25% dextrose exchange for diagnostic purposes. A sodium dip ≤5 mmol/L and/or a sodium sieving ratio ≤0.03 at 1 h indicates UF insufficiency. (GRADE 2B). GUIDELINE 4B: Clinical implications of intrinsic membrane dysfunction (de novo or acquired): in the absence of residual kidney function, this is likely to necessitate the use of hypertonic glucose exchanges and possible transfer to haemodialysis. Acquired membrane injury, especially in the context of prolonged time on treatment, should prompt discussions about the risk of encapsulating peritoneal sclerosis. (practice point). GUIDELINE 5: Additional membrane function tests: measures of peritoneal protein loss, intraperitoneal pressure and more complex tests that estimate osmotic conductance and 'lymphatic' reabsorption are not recommended for routine clinical practice but remain valuable research methods. (practice point). GUIDELINE 6: Socioeconomic considerations: When resource constraints prevent the use of routine tests, consideration of membrane function should still be part of the clinical management and may be inferred from the daily UF in response to the prescription. (practice point).

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.

Prevalence of Symptoms and Symptom Clusters of Patients on Dialysis in Uruguay.

BACKGROUND: Patients on dialysis report high levels of symptom burden. The association of these symptoms may have an increased deleterious effect on the patients' well-being. OBJECTIVE: This study aimed to assess the prevalence of symptoms, to identify symptom clusters, and to describe the impact of concurrent symptoms on physical and emotional well-being in a sample of dialysis patients. METHODS: Data of the first assessment of a longitudinal study aimed to assess patient-reported outcomes in dialysis were included here. The KDQOL-36 PCS, MCS and Symptom Subscale, the Hospital Anxiety and Depression Scales and the Epworth Sleepiness Scale were analyzed. The ICLUST procedure was followed for hierarchical cluster analyses. RESULTS: Of the 512 eligible patients, 493 accepted to participate, 43.6 % were female, with mean age of 60.9 (SD=16.7). Treatment modality was HD in 87.6% of patients. Most prevalent and severe symptoms were muscle sores, cramps, "washed out", dry skin, and itchy skin, Moderate to severe pain was reported by 25%, and daily somnolence by 12.4% of the patients. Five first level symptom clusters were identified as cutaneous, cardiac, digestive, sensory-motor, energy. Both, the presence of any cluster and cluster scores were significantly associated with lower physical and mental quality of life and a higher psychological distress. CONCLUSIONS: Our study confirms the presence of high symptom burden in dialysis patients in Uruguay. Several symptom clusters were identified having significant impact on the patients' well-being. The identification of symptom clusters can help to understand common underlying pathways. It is possible that the management of symptom clusters may reduce symptom burden in these patients.

Risk Factors And Prevention of Peritoneal Dialysis-Related Peritonitis.

BACKGROUND: Peritonitis is a major complication and the main cause of peritoneal dialysis (PD) failure. The aim of the present study was to evaluate peritonitis risk factors and its prevention with a new peritoneal educational program (NPEP). METHODS: We performed a retrospective analysis of a cohort of chronic PD patients, older than 16 years, who began PD in the period 1 January 1999 to 31 December 2015 at a Uruguayan PD center, with follow-up until 31 December 2016. RESULTS: The population included 222 cases (219 patients, 128 men), median age 59 (interquartile range [IQR] 47.0 - 72.0) years, median time on PD 17.5 (IQR 6.0 - 36.2) months. Ninety-five patients suffered 1 or more episodes of peritonitis, and they had been on PD for a longer period and had nasal-positive culture more frequently. A NPEP started in September 2008; patients who trained with it, as well as younger patients, had longer peritonitis-free survival. After the NPEP, global peritonitis rates decreased significantly (from 0.48 to 0.29 episodes/patient-year, respectively), particularly gram-positive bacteria and Staphylococcus aureus / coagulase-negative (CoNS) (from 0.26 to 0.12 and 0.21 to 0.07 episodes/patient-year, respectively). In the multivariate Cox analysis of peritonitis risk factors, survival to first peritonitis was significantly associated only with age (hazard ratio [HR] 1.024, 95% confidence interval [CI] 1.007 - 1.397, p = 0.007) and the NPEP (HR 0.600, 95% CI 0.394 - 0.913, p = 0.017). CONCLUSION: A multidisciplinary peritoneal educational program may improve peritonitis rates, independently of other risk factors.

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.

Peritonitis in peritoneal dialysis patients in Uruguay.

Uruguay is a South American country (3241003 inhabitants) where renal replacement treatment is universally available. The aim of this study was to analyze the incidence and outcome of peritonitis, and the causative organisms and their sensitivity, in order to recommend an empiric initial antibiotic treatment. A retrospective descriptive study of all peritonitis during the period 2004-2005 was performed (144 peritonitis, 44% due to gram-positive bacteria). We conclude that the high prevalence of methicillin-resistant coagulase-negative staphylococci justifies the use of vancomycin in the national empiric initial antibiotic protocols.

Temporal trends in biopsy proven glomerular disease in Uruguay, 1990-2014.

Our aim is to describe variations in the incidence rates of glomerular disease diagnosed by renal biopsies performed in Uruguay over the last 25 years in relation to sex, age, clinical presentation and histological diagnosis. We analyzed all renal biopsies performed in Uruguay during the 25 years period and estimated incidence rates per million people per year (pmp/yr) for the population older than 14 years. Mann Kendall's trend analysis was used to assess incidence trends. In order to identify changes in trends, we compared annual incidence rates with the Joinpoint method. From 1990 to 2014, 3390 biopsies of native kidneys corresponding to glomerular disease were performed in patients older than 14 years. The average biopsy rate was 58 per pmp/yr. The glomerular disease incidence rate increased progressively over the period (p<0.05). Trends analysis over five-year periods demonstrated a progressive increase of IgA nephropathy (3.08 pmp/yr 1990-1994 to 12.53 pmp/yr 2010-2014 p<0.05), membranous nephropathy (2.38 pmp/yr 1990-1994 to 8.04 pmp/yr 2010-2014 p< 0.05) and lupus nephritis (4,23 pmp/yr 1990-1994 to 7,81 pmp/yr 2010-2014 p<0.05). There was a change in the trend of focal segmental glomerular sclerosis (FSGS) which increased until 1996 and decreased afterwards. The incidence rates of glomerular disease have doubled globally in the last quarter of a century in Uruguay, mainly related to the increase of IgA nephropathy, membranous nephropathy and lupus nephritis. There was a change in the slope of the incidence rate of FSGS.

Duration of Treatment with Corticosteroids and Recovery of Kidney Function in Acute Interstitial Nephritis.

BACKGROUND AND OBJECTIVES: Drug-induced acute interstitial nephritis represents an emerging cause of acute kidney disease, especially among polymedicated elderly patients. Although corticosteroids are frequently used, controversy exists about the timing of initiation, efficacy, safety, and duration of treatment. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: We performed a retrospective study of 182 patients with biopsy-proven drug-induced acute interstitial nephritis from 13 Spanish centers. Exposure was defined as the length of corticosteroid treatment. The main outcome was the level of serum creatinine at month 6, with respect to baseline values. RESULTS: The most common offending agents were nonsteroidal anti-inflammatory drugs (27%). In 30% of patients, the offending drug could not be identified. The median time to suspected drug withdrawal was 11 days (interquartile range, 5-22). All patients presented with acute kidney disease and were treated with corticosteroids. The mean initial dose of prednisone was 0.8±0.2 mg/kg per day. High-dose corticosteroid treatment was maintained for 2 weeks (interquartile range, 1-4). After 6 months, the mean recovered GFR was 34±26 ml/min per 1.73 m2 and ten patients required maintenance dialysis. Use of high-dose corticosteroids for 3 weeks or treatment duration >8 weeks were not associated with better recovery of kidney function. In the multivariable analysis, delayed onset of steroid treatment (odds ratio, 1.02; 95% confidence interval, 1.0 to 1.04) and the presence of interstitial fibrosis of >50% on the kidney biopsy specimen (odds ratio, 8.7; 95% confidence interval, 2.7 to 27.4) were both associated with serum creatinine level at month 6 of >75%, with respect to baseline values. CONCLUSIONS: High-dose corticosteroid treatment for 3 weeks or prolonged treatment for >8 weeks were not associated with greater kidney function recovery in drug-induced acute interstitial nephritis. A delay in the initiation of corticosteroids resulted in worse recovery of kidney function.

Primeras recomendaciones de consenso SLANH - COLABIOCLI / Primeiras Recomendações de Consenso SLANH - COLABIOCLI / (Sociedad Latinoamericana de Nefrología e Hipertensión - Confederación Latinoamericana de Bioquímica Clínica) / Informe de la tasa de filtración glomerular estimada junto a la determinación de la creatininemia en población adulta / First SLANH-COLABIOCLI Consensus Recommendations

Resumen La enfermedad renal crónica (ERC) es de alta prevalencia en América Latina y en todo el mundo. Se estima que entre 10 y 20% de la población adulta es portadora de ERC y su prevalencia va en aumento. La ERC progresa en forma silenciosa. Su diagnóstico temprano y oportuno permite iniciar un tratamiento efectivo, en la mayoría de los casos, para detener la enfermedad. Desde hace mucho tiempo, el análisis de la creatininemia es la principal prueba utilizada para valorar la función renal, pero su confiabilidad es limitada. De acuerdo con las recomendaciones de las GUIAS KDOQI del año 2002 la tasa de filtración glomerular estimada (TFGe) obtenida a través de fórmulas, se estableció como una de las herramientas principales para detectar la enfermedad renal de manera precoz, ya que alerta de forma precisa al médico y al equipo de salud sobre el nivel de función renal del paciente. La detección de una TFGe disminuida (menor de 60 mL/min/1,73 m2) es clínicamente relevante, ya que permite establecer el diagnóstico de enfermedad renal en adultos. En el año 2022, en una encuesta realizada por SLANH y COLABIOCLI dirigida a los laboratorios de análisis clínicos de América Latina (n: 237), el 49% de los mismos no informaban la TFGe rutinariamente. En base a esta realidad SLANH y COLABIOCLI elaboraron estas recomendaciones de consenso en referencia al uso de la TFGe.

Abstract Chronic kidney disease (CKD) has a high prevalence worldwide and in Latin America (10 to 20% of the adult population) and is increasing. CKD progresses silently. Opportune diagnosis and treatment are effective in most cases to improve outcomes. Serum creatinine was the main test to assess kidney function, but its reliability is limited. Through the KDOQI Guidelines 2002, the estimated glomerular filtration rate (eGFR) obtained from equations was established as one of the main tools for the early detection of kidney disease in clinical practice. The detection of a decreased eGFR (less than 60 mL/min/1.73 m2) is clinically relevant. This cut-off level establishes the diagnosis of kidney disease in adults. In 2022 SLANH and COLABIOCLI conducted a survey among the clinical laboratories from Latin America. The survey included 237 laboratories, 49% of which did not routinely report the eGFR. Based on this situation, SLANH and COLABIOCLI have elaborated the following consensus recommendations regarding the use of eGFR.

Resumo A doença renal crônica (DRC) é altamente prevalente na América Latina e em todo o mundo. Estima-se que entre 10 e 20% da população adulta seja portadora de DRC e sua prevalência esteja aumentando. A DRC progride silenciosamente. Seu diagnóstico precoce e oportuno permite iniciar um tratamento eficaz, na maioria dos casos, para estancar a doença. Faz muito tempo, a análise da creatinina tem sido o principal teste usado para avaliar a função renal mas sua confiabilidade é limitada. De acordo com as recomendações dos GUIAS KDOQI do ano de 2002, a estimativa da taxa de filtração glomerular (eGFR), obtida por meio de fórmulas, consolidou-se como uma das principais ferramentas para a detecção precoce da doença renal, visto que alerta com precisão ao médico e ao equipe de saúde sobre o nível de função renal do paciente. A detecção de uma eGFR diminuída (inferior a 60 mL/min/1,73 m2) é clinicamente relevante, pois permite estabelecer o diagnóstico de doença renal em adultos. No ano de 2022, em pesquisa realizada pela SLANH e COLABIOCLI dirigida a laboratórios de análises clínicas da América Latina (n: 237), 49% deles não relataram rotineiramente eGFR. Com base nessa realidade, SLANH e COLABIOCLI prepararam essas recomendações de consenso sobre o uso de eGFR.

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.

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.

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.

Estimation of Glomerular Filtration Rate Based on Serum Cystatin C versus Creatinine in a Uruguayan Population.

Background. Estimation of glomerular filtration rate (eGFR) from biomarkers has evolved and multiple equations are available to estimate renal function at bedside. Methods. In a random sample of 119 Uruguayans (54.5% women; 56.2 years (mean)), we used Bland and Altman's method and Cohen's kappa statistic to assess concordance on a continuous or categorical (eGFR < 60 versus ≥60 mL/min/1.73 m(2)) scale between eGFRcys (reference) and eGFR derived from serum creatinine according to the Modification of Diet in Renal Disease (eGFRmdrd) or the Chronic Kidney Disease Epidemiology Collaboration equations (eGFRepi) or from both serum cystatin C and creatinine (eGFRmix). Results. In all participants, eGFRmdrd, eGFRepi, and eGFRmix were, respectively, 9.7, 11.5, and 5.6 mL/min/1.73 m(2) higher (P < 0.0001) than eGFRcys. The prevalence of eGFR <60 mL/min/1.73 m(2) was the highest for eGFRcys (21.8%), intermediate for eGFRmix (11.8%), and the lowest for eGFRmdrd (5.9%) and eGFRepi (3.4%). Using eGFRcys as reference, we found only fair agreement with the equations based on creatinine (Cohen's kappa statistic 0.15 to 0.23). Conclusion. Using different equations we reached clinically significant differences in the estimation of renal function. eGFRcys provides lower estimates, resulting in higher prevalence of eGFR <60 mL/min/1.73 m(2).

Función renal en pacientes ambulatorios con insuficiencia cardíaca con fracción de eyección reducida; análisis de su evolución e implicancia pronóstica. Seguimiento a 4 años en una Unidad Multidisciplinaria de Insuficiencia Cardíaca / Renal function in outpatients with heart failure with reduced ejection fraction; analysis of its evolution and forecast implications. A 4 year follow up in a Multidisciplinary Unit of Heart Failure / Função renal em pacientes ambulatoriais com insuficiência cardíaca com fração de ejeção reduzida; análise de sua evolução e implicações prognósticas. Acompanhamento de até 4 anos em uma Unidade Multidisciplinar de Insuficiência Cardíaca

Resumen: Introducción: El deterioro de la función renal está asociado a un aumento de la mortalidad en los pacientes con insuficiencia cardíaca (IC). El objetivo de este estudio fue evaluar si la progresión de la enfermedad renal en pacientes estables portadores de IC con fracción de eyección reducida (ICFEr) y enfermedad renal crónica (ERC) se asocia a eventos cardiovasculares (ECV), hospitalización por IC y muerte. Metodología: Estudio de cohorte de seguimiento a 4 años, con análisis en dos etapas: tiempo 1 (inicio del estudio); y tiempo 2 (fin del estudio o muerte). Se definió ICFEr estable como IC con una fracción de eyección del ventrículo izquierdo (FEVI)<40% sin elementos de descompensación. Se definió ERC con la presencia de un filtrado glomerular estimado (FGe) < 60 ml/min/1,73 y ERC estable en ausencia de fracaso renal agudo. Resultados: Se incluyeron 94 pacientes con media de seguimiento de 37,2 meses; la edad media fue 69,5 años, 71.3% de sexo masculino. La cardiomiopatía era isquémica en 48% y la nefropatía vascular fue la predominante (62%). Se diagnosticó síndrome cardio-renal tipo 2 en 76 (81%) pacientes. Se evidenció descenso significativo del FGe entre los tiempos de análisis (tiempo 1: 45 ± 10 ml/min.; tiempo 2: 38 ± 15 ml/min.; p < 0,001) y 50% de los pacientes tuvieron peoría del estadio de ERC (p = 0,027). Se halló asociación entre progresión de la ERC con mayor frecuencia de ECV (P=0,002), ingresos por IC (OR 3,3;IC95% 1,9-11,2; p = 0.044) y muerte cardiovascular (OR 10,9;IC95% 2,9-40,1; p < 0.001). Conclusiones: La progresión de la ERC en pacientes con ICFEr ambulatorios se asocia a un peor pronóstico en términos de mortalidad cardiovascular, ingresos por IC y ECV.

Abstract: Introduction: Deterioration of renal function is associated with increased mortality in patients with heart failure (HF). The objective of the present study was to assess whether the progression of kidney disease is associated with the appearance of cardiovascular events (CVE), hospitalization for HF and death in a cohort of stable outpatients with chronic kidney disease (CKD) and Heart failure with reduced ejection fraction (HFrEF). Methodology: A 4 years follow-up cohort study, with a two stage analysis: time 1 (start of the study); and time 2 (end of study or death). Stable HFrEF was defined as HF with an ejection fraction of the left ventricle (LVEF)<40% without elements of decompensation. An estimated glomerular filtration less than 60 ml / min / 1.73 was used as diagnostic criterion for CKD and stable CKD in the absence of acute renal failure. Results: A total of 94 patients were included with a follow up mean of 37.2 months; the mean age was 69.5 years ± 9 years, 71.3% were male. Cardiomyopathy was ischemic in 48% and vascular nephropathy was predominant (62%). Cardio-renal syndrome type 2 was diagnosed in 76 (81%) patients. There was a significant decrease in eGFR between the time of analysis (time 1: 45 ± 10 ml/min, time 2: 38 ± 15 ml/min, p <0.001) and 50% of patients worsened their stage of CKD (p = 0.027). An association was found between progression of CKD with a higher frequency of CVD (P = 0.002), hospitalization for HF (OR 3.3, 95% CI 1.9-11.2, p = 0.044) and cardiovascular death (OR 10.9, 95% CI 2.9-40.1, p <0.001). Conclusions: The progression of CKD is associated with a worse prognosis in not hospitalized HF patients in terms of cardiovascular mortality, admissions for HF and CVE.

Resumo: Introdução: A deterioração da função renal está associada ao aumento da mortalidade em pacientes com insuficiência cardíaca (IC). O objectivo deste estudo foi avaliar se a progressão da doença renal em pacientes com IC estáveis ​​com fracção de ejecção reduzida (ICFER) e doença renal crónica (IRC) está associada com eventos cardiovasculares (DCV), HF hospitalização e morte. Metodologia: Estudo de coorte de acompanhamento aos 4 anos, com análise em duas etapas: tempo 1 (início do estudo); e tempo 2 (fim do estudo ou morte). O rEFFE estável foi definido como IC com fração de ejeção do ventrículo esquerdo (FEVE) <40% sem elementos de descompensação. DRC foi definida na presença de uma taxa de filtração glomerular estimada (EGFR) <60 ml / min / 1,73 CEI e estável na ausência de insuficiência renal aguda. Resultados: Foram incluídos 94 pacientes com seguimento médio de 37,2 meses; a idade média foi de 69,5 anos, 71,3% do sexo masculino. A cardiomiopatia era isquêmica em 48% e a nefropatia vascular era predominante (62%). Síndrome Cardio-renal tipo 2 foi diagnosticada em 76 (81%) pacientes. diminuição significativa da taxa de filtração glomerular entre os tempos de verificação (45 ± 10 ml / min; cerca de 2 cerca de 1 38 ± 15 ml / min; p <0,001) foi evidenciado e 50% dos pacientes tiveram a fase de Peoria DRC (p = 0,027). e morte cardiovascular (OU 10,9 associação entre a progressão DRC de DCV com maior frequência (P = 0,002), o rendimento de IC (OR 3.3, 95 % CI 1.9-11.2 p = 0,044), verificou-se IC 95% 2,9-40,1, p <0,001). Conclusões: A progressão da DRC em pacientes com HFrR ambulatorial está associada a um pior prognóstico em termos de mortalidade cardiovascular, IC e DCV

Using a multidisciplinary training program to reduce peritonitis in peritoneal dialysis patients.

OBJECTIVES: The present study evaluated the tool used to assess patients' skills and the impact on peritonitis rates of a new multidisciplinary peritoneal dialysis (PD) education program (PDEP). METHODS: After the University Hospital Ethics Committee approved the study, the educational and clinical records of PD patients were retrospectively analyzed in two phases. In phase I, an Objective Structured Assessment (OSA) was used during August 2008 to evaluate the practical skills of 25 patients with adequate Kt/V and no mental disabilities who had been on PD for more than 1 month. Test results were correlated with the prior year's peritonitis rate. In phase II, the new PDEP, consisting of individual lessons, a retraining schedule, and group meetings, was introduced starting 1 September 2008. Age, sex, years of education, time on PD, number of training sessions, and peritonitis episodes were recorded. Statistical analyses used t-tests, chi-square tests, and Poisson distributions; a p value of less than 0.05 was considered significant. RESULTS: In phase I, 25 patients [16 men, 9 women; mean age: 54 ± 15 years (range: 22 - 84 years); mean time on PD: 35 ± 30 months (range: 1 - 107 months)] were studied. The OSA results correlated with peritonitis rates: patients who passed the test had experienced significantly lower peritonitis rates during the prior year (p < 0.05). In phase II, after the new PDEP was introduced, overall peritonitis rates significantly declined (to 0.28 episodes/patient-year from 0.55 episodes/patient-year, p < 0.05); the Staphylococcus peritonitis rate also declined (to 0.09 episodes/patient-year from 0.24 episodes/patient-year, p < 0.05). CONCLUSIONS: The OSA is a reliable tool for assessing patients' skills, and it correlates with peritonitis rates. The multidisciplinary PDEP significantly improved outcomes by further lowering peritonitis rates.

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.