Renal deficit and associated factors in children born with low birth weight / Déficit renal e fatores associados em crianças nascidas com baixo peso

ABSTRACT Introduction: Kidney problems may be due to low birth weight alone or may occur in association with other conditions. The objective this study was to evaluate the association between maternal and birth characteristics, anthropometric measurements, and kidney function deficit in low birth weight infants. Methods: Cross-sectional study with children who were born weighing < 2500 grams and were under outpatient follow-up. Maternal factors investigated were prenatal care and presence of hypertension, diabetes, and infection during pregnancy. The children's variables were sex, gestational age, birth weight, Apgar score, use of nephrotoxic medications, age, body weight at the time of evaluation, height, and serum creatinine and cystatin C dosages. The glomerular filtration rate (GFR) was estimated with the combined Zapittelli equation. Multivariate logistic regression model was used for identification of associated factors, with renal function deficit (GFR < 60 mL/min/1.73 m2) as the dependent variable. Results: Of the 154 children evaluated, 34.42% had kidney function deficit. Most of them had a gestational age > 32 weeks (56.6%), a mean birth weight of 1439.7 grams, and mean estimated GFR of 46.9 ± 9.3 mL/min/1.73 m2. There was a significant association of GFR < 60 mL/min/1.73 m2 with children's current weight and use of nephrotoxic drugs. Discussion: Children born with low birth weight had a high prevalence of kidney function deficit and current normal weight was a protective factor while the use of nephrotoxic drugs during perinatal period increased the chance of kidney deficit. These findings reinforce the need to evaluate the kidney function in these children, especially those who use nephrotoxic drugs.

RESUMO Introdução: Problemas renais podem ser devido apenas ao baixo peso ao nascer ou podem ocorrer em associação com outras condições. O objetivo deste estudo foi avaliar a associação entre características maternas e de nascimento, medidas antropométricas e déficit da função renal em bebês de baixo peso ao nascer. Métodos: Estudo transversal com crianças que nasceram com peso < 2500 gramas e estavam sob acompanhamento ambulatorial. Os fatores maternos investigados foram cuidados pré-natal e presença de hipertensão, diabetes e infecção durante a gravidez. As variáveis das crianças foram sexo, idade gestacional, peso ao nascer, índice Apgar, uso de medicamentos nefrotóxicos, idade, peso corporal no momento da avaliação, altura e dosagens séricas de creatinina e cistatina C. A taxa de filtração glomerular (TFG) foi estimada com a equação combinada de Zapittelli. Utilizou-se um modelo de regressão logística multivariada para identificação de fatores associados, com déficit da função renal (TFG < 60 mL/min/1,73 m2) como variável dependente. Resultados: Das 154 crianças avaliadas, 34,42% apresentaram déficit da função renal. A maioria tinha idade gestacional > 32 semanas (56,6%), peso médio ao nascer de 1439,7 gramas, e TFG média estimada de 46,9 ± 9,3 mL/min/1,73 m2. Houve uma associação significativa da TFG < 60 mL/min/1,73 m2 com o peso atual das crianças e o uso de medicamentos nefrotóxicos. Discussão: Crianças nascidas com baixo peso apresentaram alta prevalência de déficit da função renal e o peso atual normal foi um fator de proteção, enquanto o uso de medicamentos nefrotóxicos durante o período perinatal aumentou a chance de déficit renal. Estes achados reforçam a necessidade de avaliar a função renal destas crianças, especialmente aquelas que usam medicamentos nefrotóxicos.

Validação das equações para estimativa da filtração glomerular ajustáveis por raça/cor em adultos de Vitória, Espírito Santo, Brasil / Validation of glomerular filtration estimation equations adjustable by race/colour in adults from Vitória, Espírito Santo, Brazil

Resumo A avaliação da função renal é feita por meio da taxa de filtração glomerular (TFG), que pode ser determinada pelo clearance de creatinina (CrCl) e é dependente da coleta urinária de 24 horas (h), o que dificulta o seu uso na atenção primária. As equações que estimam a TFG a partir da creatinina sérica tornam o exame mais acessível, contudo, os seus ajustes por raça/cor têm sido questionados em populações miscigenadas. Para verificar a concordância entre o ClCr e a TFG estimada por fórmulas (Modification of Diet in Renal Disease [MDRD-4] e Chronic Kidney Disease Epidemiology Collaboration [CKD-EPI]), com ou sem ajuste por raça/cor, foram utilizados dados de subestudo da Pesquisa Nacional de Saúde (PNS) com inclusão de 272 adultos de Vitória, Espírito Santo, que fizeram coleta urinária de 24h. Adotou-se análise de variância (ANOVA) e método de Bland-Altman. Houve concordância adequada entre o ClCr e as equações, mas o ajuste por raça/cor diminui a acurácia destas últimas. No fator raça/cor, houve semelhança entre grupos para o ClCr (p=0,21) sugerindo não haver diferença no metabolismo da creatinina em função da cor da pele. Conclui-se que MDRD-4 e CKD-EPI apresentam desempenho satisfatório na avaliação da função renal, não sendo recomendado o uso de correções para raça/cor.

Abstract The assessment of renal function is performed using the glomerular filtration rate (GFR) whose measurement by creatinine clearance (ClCr) and is dependent on a 24-hour urine sample, hindering it use in primary healthcare. The equations that estimate GFR from serum creatinine make the test more accessible, however, their adjustments by race/color have been questioned in mixed populations. To test the agreement between CrCl and GFR estimated by formulas (Modification of Diet in Renal Disease [MDRD-4] and Chronic Kidney Disease Epidemiology Collaboration [CKD-EPI]), with or without adjusting for race/color, data were used from a sub-study of the National Health Survey (NHS) including 272 adults from Vitória/Espírito Santo who underwent a 24-hour urinary sampling. Analysis of variance (ANOVA) and the Bland-Altman method were adopted. There was adequate agreement between ClCr and equations, but the adjustment by race/color decreases the accuracy of both equations. In the race/color factor, there was similarity between groups for CrCl (p=0.21), suggesting that there is no difference in creatinine metabolism induced by skin color. It is concluded that MDRD and CKD-EPI equations perform satisfactorily in the evaluation of renal function, and the use of corrections for race/color is not recommended.

Different methods for assessing glomerular filtration rate in the elderly

SUMMARY OBJECTIVE: The objective of this study was to identify the best method to replace cystatin C in the evaluation of glomerular filtration in the elderly. METHODS: Individuals over 60 years of age from a primary care center were studied. Blood was collected to determine creatinine and cystatin C and 24-h urine. Three methods were compared to determine glomerular filtration: Creatinine clearance, Cocroft-Gault, modification of diet in renal disease, and Collaboration Epidemiology of Chronic Kidney Disease based on creatinine, considering as a reference the determination of glomerular filtration using the cystatin-based Chronic Kidney Disease Epidemiology Collaboration equation. The statistical methods used were linear regression, Bland-Altman curve, and receiver operating characteristic. RESULTS: A total of 180 elderly people were evaluated, but 14 patients were lost from the sample, resulting in a total of 166 patients. The average age of patients was 66.9±6.1 years, and 69.8% were females. Regarding the number of patients eligible for the study, there were 12 black, 108 brown, and 46 white, 42.77% hypertensive, and 38.3% diabetic. Glomerular filtration was less than 60 mL/min in 22.28% of patients. Regarding the evaluation of the different equations, the correlation coefficient was lower for creatinine clearance and progressively higher for Cocroft-Gault, modification of diet in renal disease, and Collaboration Epidemiology of Chronic Kidney Disease based on creatinine. The Bland-Altman diagram and the receiver operating characteristic curve showed similar performance to the correlation coefficient for the different equations evaluated. CONCLUSION: Collaboration Epidemiology of Chronic Kidney Disease based on creatinine presented the best performance. Creatinine debug had the worst performance, which reinforces the idea that 24-h urine collection is unnecessary in these patients.

The influence of hemodialysis on intracranial pressure waveform in patients with chronic kidney disease: an observational study

ABSTRACT BACKGROUND: Among the complications related to chronic kidney disease (CKD), those of a neurological nature stand out, and for a better quality of life for patients, the diagnosis and treatment of these complications is fundamental. OBJECTIVES: This study aimed to assess the effect of hemodialysis on intracranial pressure waveform (ICPw) in patients with chronic kidney disease undergoing hemodialysis and those who are not yet undergoing substitutive therapy. DESIGN AND SETTING: An observational study was conducted in two stages at a kidney replacement therapy center in Brazil. The first was a longitudinal study and the second was a cross-sectional study. METHODS: Forty-two patients on hemodialysis were included in the first stage of the study. In the second stage, 226 participants were included. Of these, 186 were individuals with chronic kidney disease (who were not undergoing substitutive therapy), and 40 did not have the disease (control group). The participants' intracranial compliance was assessed using the non-invasive Brain4care method, and the results were compared between the groups. RESULTS: There was a significant difference between the hemodialysis and non-hemodialysis groups, with the former having better ICPw conditions. CONCLUSIONS: Hemodialysis influenced the improvement in ICPw, probably due to the decrease in the patients' extra-and intracellular volumes. Furthermore, ICPw monitoring can be a new parameter to consider when defining the moment to start substitutive therapy.

Predictive Value of Serum Albumin Levels for Coronary Artery Calcification in Patients with Early Chronic Kidney Disease / 中山大学学报(医学科学版)

ObjectiveTo explore the correlation between serum albumin levels and coronary artery calcification （CAC） in patients with early-stage chronic kidney disease （CKD）， as well as the value of serum albumin levels in predicting the incidence and severity of CAC. MethodsThe study included 391 early-stage CKD patients who underwent coronary computed tomography angiography （CTA） at Sun Yat-sen Memorial Hospital of Sun Yat-sen University between January 2019 and December 2022. Demographic and biochemistry data， as well as the coronary CTA results， were collected. Based on the coronary artery calcification score （CACS）， all patients were divided into non-CAC group （CACS=0， n=184） and CAC group （CACS>0， n=207）. All patients were further divided into 3 groups based on the serum albumin levels： group A （serum albumin levels<35 g/L， n=30）， group B （35 g/L≤ serum albumin levels< 40 g/L， n=198） and group C （serum albumin levels≥ 40 g/L， n=163）. Univariate and multivariate binary logistic regression analyses were conducted to investigate the association between serum albumin levels and CAC in early-stage CKD patients. Differences in CAC among groups were analyzed by using post-hoc multiple comparisons and ordinal logistic regression model analysis. ResultsPatients with CAC had significantly lower serum albumin levels than those without CAC （P<0.05）. There was a negative correlation between serum albumin levels and CACS in early-stage CKD patients （P<0.01）， as serum albumin decreased in levels， CAC increased in severity. ConclusionsOur study shows that early-stage CKD patients with lower serum albumin levels have a higher incidence of CAC. Low serum albumin level is an independent risk factor for CAC progression.

Reduction of estimated glomerular filtration rate after COVID-19-associated acute kidney injury / Redução da taxa de filtração glomerular estimada após injúria renal aguda associada à COVID-19

ABSTRACT Introduction: Acute Kidney Injury (AKI), a frequent manifestation in COVID-19, can compromise kidney function in the long term. We evaluated renal function after hospital discharge of patients who developed AKI associated with COVID-19. Methods: This is an ambidirectional cohort. eGFR and microalbuminuria were reassessed after hospital discharge (T1) in patients who developed AKI due to COVID-19, comparing the values with hospitalization data (T0). P < 0.05 was considered statistically significant. Results: After an average of 16.3 ± 3.5 months, 20 patients were reassessed. There was a median reduction of 11.5 (IQR: -21; -2.1) mL/min/1.73m2 per year in eGFR. Forty-five percent of patients had CKD at T1, were older, and had been hospitalized longer; this correlated negatively with eGFR at T1. Microalbuminuria was positively correlated with CRP at T0 and with a drop in eGFR, as well as eGFR at admission with eGFR at T1. Conclusion: There was a significant reduction in eGFR after AKI due to COVID-19, being associated with age, length of hospital stay, CRP, and need for hemodialysis.

RESUMO Introdução: A Injúria Renal Aguda (IRA), uma manifestação frequente na COVID-19, pode comprometer a função renal em longo prazo. Avaliamos a função renal após a alta hospitalar de pacientes que desenvolveram IRA associada à COVID-19. Métodos: Esta é uma coorte ambidirecional. A TFGe e a microalbuminúria foram reavaliadas após a alta hospitalar (T1) em pacientes que desenvolveram IRA devido à COVID-19, comparando os valores com dados de hospitalização (T0). P < 0,05 foi considerado estatisticamente significativo. Resultados: Após uma média de 16,3 ± 3,5 meses, 20 pacientes foram reavaliados. Houve uma redução média de 11,5 (IIQ: -21; -2,1) mL/min/1,73m2 por ano na TFGe. Quarenta e cinco por cento dos pacientes apresentaram DRC no T1, eram mais velhos e haviam sido hospitalizados por mais tempo; isso se correlacionou negativamente com a TFGe no T1. A microalbuminúria foi positivamente correlacionada com a PCR no T0 e com uma queda na TFGe, assim como a TFGe na admissão com a TFGe no T1. Conclusão: Houve uma redução significativa na TFGe após IRA devido à COVID-19, sendo associada à idade, tempo de internação, PCR e necessidade de hemodiálise.

Frailty and chronic kidney disease: associations and implications / Fragilidade e doença renal crônica: associações e implicações

ABSTRACT Introduction: Frailty and its association with chronic kidney disease (CKD) has been established previously. The present study examined this association further by studying the distribution of frailty among groups defined by different stages of the disease. It also identified associated health deficits and explored their association with estimated glomerular filtration rate (eGFR) and urine albumin creatinine ratio (UACR). Methods: A cross-sectional survey was conducted on 90 non-dialysis dependent CKD Stage 1-4 patients, recruited in three stratified groups of 30 participants each based on the stage of disease. Frailty was assessed using Fried's frailty criteria and associated health deficits were recorded using a pre-determined list. Depression was screened using a 4-point depression scale. Results: 21.1% of the participants were frail and 43.3% were pre-frail. The proportion of frailty in CKD groups A (Stages 1 and 2), B (Stage 3a), and C (Stages 3b and 4) was 10%, 13.3%, and 40%, respectively. The association of health deficits including co-morbidities, physical parameters, mental status, daily activities, etc. with UACR, eGFR, and CKD stages was not statistically significant. Nearly one in two frail participants was depressed compared with 14% among non-frail participants. Conclusion: The skewed distribution of 21% frail subjects identified in our study indicates an association between frailty and advancing kidney disease. Frail individuals had a lower eGFR, higher UACR, were more likely to be depressed, and had higher count of health deficits and poorer performance on Barthel Index of Activities of Daily Living and WHOQOL. Early identification of depression would improve care in these patients.

RESUMO Introdução: Fragilidade e sua associação com DRC foram estabelecidas anteriormente. O presente estudo aprofundou esta associação, estudando distribuição da fragilidade entre grupos definidos por diferentes estágios da doença. Também identificou déficits de saúde associados e explorou sua associação com taxa de filtração glomerular estimada (TFGe) e relação albumina/creatinina urinária (RAC). Métodos: Realizou-se uma pesquisa transversal em 90 pacientes com DRC Estágios 1-4 não dependentes de diálise, recrutados em três grupos estratificados de 30 participantes cada, conforme estágio da doença. Avaliou-se fragilidade usando os critérios de fragilidade de Fried e registraram-se os déficits de saúde associados usando uma lista pré-determinada. A depressão foi verificada utilizando a escala de depressão de 4 pontos. Resultados: 21,1% dos participantes eram frágeis e 43,3% eram pré-frágeis. A proporção de fragilidade nos grupos de DRC A (Estágios 1 e 2), B (Estágio 3a), e C (Estágios 3b e 4) foi de 10%, 13,3%, 40% respectivamente. A associação de déficits de saúde, incluindo comorbidades, parâmetros físicos, estado mental, atividades diárias etc. com RAC, TFGe e estágios da DRC não foi estatisticamente significativa. Cerca de um em cada dois participantes frágeis estava depressivo comparados com 14% entre não frágeis. Conclusão: A distribuição enviesada de 21% dos indivíduos frágeis identificados em nosso estudo indica associação entre fragilidade e doença renal progressiva. Indivíduos frágeis apresentaram menor TFGe, maior RAC, eram mais propensos a depressão, tinham maior índice de déficits de saúde e desempenho inferior no Índice de Atividades da Vida Diária de Barthel e WHOQOL. A identificação precoce da depressão melhoraria o atendimento desses pacientes.

Maior Rigidez Arterial Prediz Doença Renal Crônica no Estudo de Coorte ELSA-Brasil / Higher Arterial Stiffness Predicts Chronic Kidney Disease in Adults: The ELSA-Brasil Cohort Study

Resumo Fundamento A rigidez arterial pode afetar diretamente os rins, que são perfundidos passivamente por alto fluxo. No entanto, determinar se a relação entre rigidez arterial e função renal depende das condições de diabetes e hipertensão é uma questão controversa. Objetivo Investigar a relação entre a rigidez arterial, por velocidade da onda de pulso carotídea-femoral (VOPcf), e a incidência de doença renal crônica (DRC) em indivíduos e verificar se essa associação está presente em indivíduos sem hipertensão e diabetes. Métodos Estudo longitudinal com 11.647 participantes do ELSA-Brasil acompanhados por quatro anos (2008/10-2012/14). A VOPcf basal foi agrupada por quartil, de acordo com pontos de corte específicos com relação a sexo. A presença de DRC foi verificada pela taxa de filtração glomerular (TFGe-CKD-EPI) < 60 ml/min/1,73 m2 e/ou relação albumina/creatinina ≥ 30 mg/g. Modelos de regressão logística foram executados para toda a coorte e uma subamostra livre de hipertensão e diabetes no início do estudo, após ajuste para idade, sexo, raça, escolaridade, tabagismo, relação colesterol/HDL, índice de massa corporal, diabetes, uso de anti-hipertensivos, pressão arterial sistólica, frequência cardíaca e doenças cardiovasculares. A significância estatística foi fixada em 5%. Resultados A chance de DRC foi de 42% (IC de 95%: 1,05;1,92) maior entre indivíduos no quartil superior da VOPcf. Entre os participantes normotensos e não diabéticos, os indivíduos do 2º, 3º e 4º quartis da VOPcf apresentaram maiores chances de desenvolver DRC, quando comparados aos do quartil inferior, sendo a magnitude dessa associação maior para aqueles do quartil superior (OR: 1,81 IC de 95%: 1,14;2,86). Conclusão A maior VOPcf aumentou as chances de DRC, e sugere que esse efeito é ainda maior em indivíduos sem diabetes e hipertensão.

Abstract Background Arterial stiffening can directly affect the kidneys, which are passively perfused by a high flow. However, whether the relation between arterial stiffness and renal function depends on diabetes and hypertension conditions, is a matter of debate. Objective To investigate the relationship between arterial stiffening by carotid-to-femoral pulse wave velocity (cfPWV) and chronic kidney disease (CKD) incidence in individuals and verify whether this association is present in individuals without hypertension and diabetes. Methods A longitudinal study of 11,647 participants of the ELSA-Brasil followed up for four years (2008/10-2012/14). Baseline cfPWV was grouped per quartile, according to sex-specific cut-offs. Presence of CKD was ascertained by glomerular filtration rate (eGFR-CKD-EPI) < 60 ml/min/1.73 m2 and/or albumin-to-creatinine ratio ≥ 30 mg/g. Logistic regression models were run for the whole cohort and a subsample free from hypertension and diabetes at baseline, after adjustment for age, sex, race, schooling, smoking, cholesterol/HDL ratio, body mass index, diabetes, use of antihypertensive, systolic blood pressure, heart rate, and cardiovascular disease. Statistical significance was set at 5%. Results The chance of CKD was 42% (CI 95%: 1.05;1.92) greater among individuals in the upper quartile of cfPWV. Among normotensive, non-diabetic participants, individuals in the 2nd, 3rd, and 4th quartiles of cfPWV presented greater chances of developing CKD, as compared to those in the lower quartile, and the magnitude of this association was the greatest for those in the upper quartile (OR: 1.81 CI 95%: 1.14;2.86). Conclusion Higher cfPWV increased the chances of CKD and suggests that this effect is even greater in individuals without diabetes and hypertension.

Comparison of GFR measurement with a two-blood sample technique using [99mTc]Tc-DTPA vs. creatinine-based equations in potential kidney donors / Comparação da medição da TFG com uma técnica com duas amostras de sangue usando [99mTc]Tc-DTPA vs. equações baseadas em creatinina em potenciais doadores de rim

ABSTRACT Introduction: Accurate determination of glomerular filtration rate (GFR) is crucial for selection of kidney donors. Nuclear medicine methods are considered accurate in measuring GFR but are not always easily available. The four-variable Modification of Diet in Renal Disease (MDRD4), Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI), and Full Age Spectrum (FAS) formulas are common equations for estimating GFR and are recommended for initial assessment of kidney donors. The aim of this study was to evaluate the performance of these GFR estimation equations compared with technetium-99m diethylenetriaminepentaacetic acid ([99mTc]Tc-DTPA) clearance. Methods: We compared GFR estimation by [99mTc]Tc-DTPA clearance using a two-blood sample method with estimation by MDRD4, CKD-EPI, and FAS creatinine-based equations in a population of healthy potential kidney donors. Results: A total of 195 potential kidney donors (68.2% female; mean age 49 years, range 21-75 years) were included in this study. Mean [99mTc]Tc-DTPA measured GFR (mGFR) was 101.5 ± 19.1 mL/min/1.73 m2. All three equations underestimated the GFR value measured by [99mTc]Tc-DTPA (MDRD4: -11.5 ± 18.8 mL/min/1.73 m2; CKD-EPI: -5.0 ± 17.4 mL/min/1.73 m2; FAS: -8.3 ± 17.4 mL/min/1.73 m2). Accuracy within 30% and 10% of the measured GFR value was highest for CKD-EPI. Conclusion: The CKD-EPI equation showed better performance in estimating GFR in healthy potential kidney donors, proving to be a more accurate tool in the initial assessment of kidney donors. However, creatinine-based equations tended to underestimate kidney function. Therefore, GFR should be confirmed by another method in potential kidney donors.

RESUMO Introdução: Determinar precisamente a taxa de filtração glomerular (TFG) é crucial para seleção de doadores de rim. Métodos de medicina nuclear são considerados precisos na medição da TFG, mas nem sempre estão facilmente disponíveis. As fórmulas Modification of Diet in Renal Disease de 4 variáveis (MDRD4), Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI), e Full Age Spectrum (FAS) são equações comuns para estimar a TFG, sendo recomendadas para avaliação inicial dos doadores. Este estudo visou avaliar o desempenho destas equações de estimativa da TFG em comparação com o clearance do tecnécio-99m-ácido dietilenotriaminopentacético ([99mTc]Tc-DTPA). Métodos: Comparamos a TFG por clearance de [99mTc]Tc-DTPA usando um método com duas amostras de sangue com estimativa da TFG pelas equações MDRD4, CKD-EPI e FAS baseadas em creatinina em uma população de potenciais doadores saudáveis. Resultados: Incluiu-se 195 potenciais doadores de rim (68,2% mulheres; idade média de 49 anos, intervalo 21-75 anos). A TFG média medida por [99mTc]Tc-DTPA foi 101,5 ± 19,1 mL/min/1,73m2. As três equações subestimaram o valor da TFG medida por [99mTc]Tc-DTPA (MDRD4: -11,5 ± 18,8 mL/min/1,73 m2; CKD-EPI: -5,0 ± 17,4 mL/min/1,73 m2; FAS: -8,3 ± 17,4 mL/min/1,73 m2). A precisão dentro de 30% e 10% do valor da TFG medida foi maior para CKD-EPI. Conclusão: A equação CKD-EPI mostrou melhor desempenho na estimativa da TFG em potenciais doadores de rim saudáveis, revelando-se uma ferramenta mais precisa na avaliação inicial dos doadores. Entretanto, equações baseadas em creatinina tendem a subestimar a função renal. Portanto, a TFG deve ser confirmada por outro método em potenciais doadores.

Risk of renal damage associated with intravitreal anti-VEGF therapy for diabetic macular edema in routine clinical practice

Purpose: Vascular endothelial growth factor inhibitors (anti?VEGF) have been shown to be effective in the treatment of diabetic macular edema. However, there is little information about the systemic effects of intraocular administration of anti?VEGF drugs in patients with coexistent diabetic nephropathy because it can produce adverse renal effects. Methods: This retrospective cohort study analyzed the effect of intravitreal anti?VEGF drugs (bevacizumab, ranibizumab, or aflibercept) on eFGR and microalbuminuria (MicA) in patients with diabetic macular edema and nonproliferative retinopathy without chronic kidney disease (CKD). Results: Sixty?six patients were included, 54.5% male and 45.5% female, with a mean age of 66.70 ± 11.6 years. The mean follow?up of patients with antiangiogenic treatment was 42.5 ± 28.07 months, and the mean number of injections was 10.91 ± 7.54. In 12.1% of the cases, there was a worsening of the glomerular filtration rate (eFGR) and a 19.7% worsening of the microalbuminuria (MicA). The number of injections was not related to the worsening of the eFGR (P = 0.74) or the MicA (P = 0.239). No relationship was found between the type of drug and the deterioration of the GFR (P = 0.689) or the MicA (P = 0.53). Conclusions: Based on the results, there is a small proportion of patients with increase in MicA and the decrease in eFGR after anti?VEGF therapy, and these was no associated with the number of injection or the drug type. Ophthalmologists should be aware of renal damage in order to do a close monitoring of renal function and proteinuria after intravitreal administration of anti?VEGF mainly in hypertensive patients.

Factores asociados a la progresión acelerada de la enfermedad renal crónica en pacientes provenientes de la costa Caribe colombiana

Contexto: la enfermedad renal crónica (ERC) es un problema de salud pública mundial, con una prevalencia creciente y una carga sustancial sobre los sistemas de salud. Las características de los pacientes progresores rápidos junto con los factores que podrían predecir la progresión acelerada requieren una mayor exploración, sobre todo porque en Colombia no hay estudios publicados de este tipo. Objetivo: identificar los factores clínicos y sociodemográficos asociados con la progresión rápida de la ERC en una gran cohorte de pacientes de la costa norte colombiana. Metodología: este estudio observacional retrospectivo incluyó dos cohortes de pacientes de la costa norte colombiana con estadios de G1 a G4 sin diálisis. El seguimiento se realizó durante 18 meses (n = 14.420) y 24 meses (n = 10.042) y los pacientes se dividieron en progresores rápidos y progresores estables, según la pendiente de la tasa de filtración glomerular (TFGe) < -5 ml/min/1,73 m2/año o ≥ -5 mL/min/1,73 m2/año, respectivamente. Resultados: el 37,68 % de la cohorte se clasificó como progresión rápida a los 24 meses y el 28,41 % a los 18 meses. Se encontró un R2 = 0,77 en ambas cohortes para las mediciones de la TFGe, lo que indica una tendencia hacia una pérdida lineal. Además, la progresión acelerada se observó en pacientes más jóvenes y con valores más altos de tensión arterial diastólica. Conclusiones: en dos grandes cohortes de pacientes renales, aproximadamente 4 de cada 10 pacientes se clasificaron como progresores rápidos a los 24 meses de seguimiento y 3 de cada 10 a los 18 meses de seguimiento. Es importante identificar a los pacientes con mayor riesgo de progresión acelerada de la ERC en el corto plazo, para brindarles una atención personalizada y efectiva.

Background: Chronic Kidney Disease (CKD) is a global public health problem with increasing prevalence and a substantial burden on healthcare systems. The characteristics of rapid progressors and factors that may predict accelerated CKD progression require further exploration, especially since there are no published studies about this topic in Colombia. Purpose: To identify the clinical and sociodemographic factors associated with the rapid progression of CKD in a large cohort of Colombian patients. Methods: This retrospective observational study included two cohorts of G1 to G4 stage CKD patients without dialysis from the Colombian North Coast. Follow-up was conducted for 18 months (n=14,420) and 24 months (n=10,042). Patients were divided into rapid progressors and stable progressors based on the glomerular filtration rate (GFR) slope <−5 mL/min/1.73m2/year or ≥-5 mL/min/1.73 m2/year, respectively. Results: 37.68% of the cohort was classified as rapid progressors at 24 months and 28.41% at 18 months. An R2=0.77 was found in both cohorts for GFR measurements, indicating a linear trend toward loss. Furthermore, accelerated progression was observed in younger patients and those with higher diastolic blood pressure values. Conclusion: In two large cohorts of renal patients, approximately 4 out of 10 patients were classified as rapid progressors at 24 months of follow-up and 3 out of 10 at 18 months of follow-up. It is important to identify patients at higher risk of accelerated CKD progression in the short term to provide them with personalized and effective care.

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.

Long-term kidney outcomes in children after allogeneic hematopoietic stem cell transplantation assessed with estimated glomerular filtration rate equations, creatinine levels, and cystatin C levels / Desfechos renais a longo prazo em crianças após transplante alogênico de células-tronco hematopoiéticas avaliados com equações de taxa de filtração glomerular estimada, níveis de creatinina e níveis de cistatina C

Abstract Background and objective: With the widespread use of allogeneic hematopoietic stem cell transplantation (allo-HSCT), long-term complications have come to the fore. The aim of this study was to determine the prevalence and risk factors of chronic kidney disease (CKD) developing in the long term in patients who underwent allo-HSCT in childhood and also to investigate the superiority of eGFR formulas. Methods: The present study evaluated CKD in patients who underwent allo-HSCT. We analyzed the 94 children who received allo-HSCT at the Ege University in İzmir between August and November, 2019. The patients were evaluated at 2 years after transplantation. CKD was defined as a glomerular filtration rate (GFR) <90 mL/min/1.73 m2 using eGFR equations based on serum creatinine (SCr), cystatin C (CysC), and SCr plus CysC. Results: In our study, 9 (9.4%), according to Bedside Schwartz, 59 (76.6%), according to CKiD-eGFR-CysC, and 20 (26%) patients, according to CKiD-eGFR-SCr-CysC equations were identified with CKD. In cases identifies as CKD according to CysC, early development of acute kidney injury (AKI), post-transplant cytomegalovirus (CMV) reactivation and being >120 months during transplantation were found to be associated with the development of CKD. Conclusion: We may be delayed in detecting CKD by calculating SCr-based formulas in allo-HSCT cases, which is a patient group where early diagnosis and treatment of CKD is very important.

Resumo Antecedentes e objetivo: Com o uso generalizado do transplante alogênico de células-tronco hematopoiéticas (TCTH-alo), as complicações a longo prazo tornaram-se evidentes. O objetivo deste estudo foi determinar a prevalência e os fatores de risco do desenvolvimento de doença renal crônica (DRC) a longo prazo em pacientes submetidos a TCTH-alo na infância, e também investigar a superioridade das fórmulas de TFGe. Métodos: O presente estudo avaliou a DRC em pacientes que foram submetidos ao TCTH-alo. Analisamos as 94 crianças que receberam TCTH-alo na Universidade Ege em İzmir entre Agosto e Novembro de 2019. Os pacientes foram avaliados aos 2 anos após o transplante. A DRC foi definida como uma taxa de filtração glomerular (TFG) <90 mL/min/1,73 m2 usando equações de TFGe baseadas em creatinina sérica (CrS), cistatina C (CisC), e CrS mais CisC. Resultados: Em nosso estudo, 9 pacientes (9,4%), de acordo com a equação de Schwartz (à beira do leito), 59 (76,6%), de acordo com a equação DRC-TFGe-CisC, e 20 (26%) pacientes, de acordo com a equação DRC-TFGe-CrS-CisC, foram classificados com DRC. Quando a TFG é avaliada pela CisC, verificamos que o desenvolvimento precoce de lesão renal aguda (LRA), a reativação do citomegalovírus (CMV) pós-transplante e ter >120 meses durante o transplante foram associados ao desenvolvimento de DRC. Conclusão: Pode haver atraso na detecção da DRC quando usamos fórmulas baseadas em CrS em casos de TCTH-alo, que é um grupo de pacientes onde o diagnóstico e tratamento precoces da DRC são muito importantes.

Prevalence of kidney disease of unknown etiology in agricultural workers, Guatemala / Prevalencia de la nefropatía de etiología desconocida en el personal del sector agrícola de Guatemala / Prevalência de doença renal de etiologia desconhecida em trabalhadores agrícolas na Guatemala

ABSTRACT Objectives. To determine the prevalence of kidney disease of unknown etiology in banana, melon, and tomato workers in north-eastern Guatemala, and to evaluate the usefulness of a cystatin C blood test for early detection of renal disease. Methods. This was a cross-sectional, farm-based study of 462 agricultural workers conducted from June to September 2021. Epidemiological and demographic characteristics of the workers were collected through a self-administered questionnaire. Blood samples were obtained to determine glucose, creatinine and cystatin C levels. Anthropometric and clinical data were also recorded. Results. The prevalence of kidney disease of unknown etiology was 3.03% (95% confidence interval (CI): 1.36-4.70%) based on glomerular filtration rate (GFR-EPI) < 60 mL/min/1.73 m2, with a significantly higher prevalence in banana workers (5.67%; 95% CI: 2.16-9.18%) than melon workers (p = 0.009) and tomato workers (p = 0.044). Ten workers (2.16%) had reduced kidney function (GFR-EPI 60-90 mL/min/1.73 m2). The levels of cystatin C showed less variability (coefficient of variation 46.4%) than those of creatinine (coefficient of variation 67.0%), and cystatin C levels in cases with abnormal and reduced kidney function were significantly different from cases with normal kidney function (p < 0.001). Conclusions. Surveillance of the health of active farm workers and improvement of working conditions, such as sun protection, adequate hydration, and sufficient breaks, are recommended. The significant differences in cystatin C levels between cases with abnormal and reduced kidney function and those with normal kidney function suggest that cystatin C could be a useful measure for early detection of renal disease.

RESUMEN Objetivos. Determinar la prevalencia de la nefropatía de etiología desconocida en el personal de los sectores de la banana, el melón y el tomate en el noreste de Guatemala, así como la utilidad de un análisis de la cistatina C en sangre para su detección temprana. Métodos. Se llevó a cabo un estudio transversal en 462 personas que trabajan en establecimientos agrícolas entre junio y septiembre del 2021. Se utilizaron cuestionarios rellenados por las propias personas encuestadas a fin de recopilar sus características epidemiológicas y demográficas. Se tomaron muestras de sangre para determinar las concentraciones de glucosa, creatinina y cistatina C. También se obtuvieron datos antropométricos y clínicos. Resultados. La prevalencia de la nefropatía de etiología desconocida, definida por una filtración glomerular (determinada con la fórmula GRF—EPI) <60 ml/min/1,73 m2, fue del 3,03% (intervalo de confianza [IC] del 95%: 1,36-4,70%); y la cifra fue significativamente mayor en el personal del sector de la banana (5,67%; IC 95%: 2,16-9,18%) que en el de los sectores del melón (p = 0,009) y del tomate (p = 0,044). Diez personas (2,16%) presentaron una reducción de la función renal (GRF—EPI 60—90 ml/min/1,73 m2). Se observó una menor variabilidad en las concentraciones de cistatina C (coeficiente de variación del 46,4%) que en las de creatinina (coeficiente de variación del 67,0%); asimismo, hubo una diferencia significativa (p <0,001) de las concentraciones de cistatina C entre las personas con un valor anormal o una reducción de la función y las que tenían una función renal normal. Conclusiones. Se recomienda la vigilancia de la salud del personal laboral del sector agrícola y la mejora de sus condiciones de trabajo, por ejemplo mediante la protección frente a la luz solar, una hidratación adecuada y un número suficiente de pausas en el trabajo. Las diferencias significativas en las concentraciones de cistatina C entre las personas con una función renal alterada o reducida y las personas con una función renal normal hacen pensar que la determinación de la cistatina C podría ser un parámetro útil para la detección precoz de la nefropatía.

RESUMO Objetivos. Determinar a prevalência de doença renal de etiologia desconhecida em trabalhadores que cultivam banana, melão e tomate no nordeste da Guatemala e avaliar a utilidade da dosagem sanguínea de cistatina C para detecção precoce de doença renal. Métodos. Estudo transversal realizado de junho a setembro de 2021 com 462 trabalhadores rurais em unidades produtoras agrícolas. As características epidemiológicas e demográficas dos trabalhadores foram coletadas por meio de um questionário autoadministrado. Foram obtidas amostras de sangue para dosagem de glicose, creatinina e cistatina C. Os dados antropométricos e clínicos também foram registrados. Resultados. A prevalência da doença renal de etiologia desconhecida foi de 3,03% (intervalo de confiança (IC) de 95%: 1,36-4,70%), com base em uma taxa de filtração glomerular (TFG-EPI) < 60 mL/min/1,73 m2. A prevalência foi significantemente maior em cultivadores de banana (5,67%; IC de 95%: 2,16-9,18%) do que em cultivadores de melão (p = 0,009) e de tomate (p = 0,044). Dez trabalhadores (2,16%) tinham função renal reduzida (TFG-EPI 60-90 mL/min/1,73 m2). Os níveis de cistatina C foram menos variáveis (coeficiente de variação: 46,4%) que os de creatinina (coeficiente de variação: 67,0%). Os níveis de cistatina C foram significantemente diferentes entre casos com função renal alterada ou reduzida e casos com função renal normal (p < 0,001). Conclusões. Recomenda-se a vigilância da saúde dos trabalhadores rurais ativos e a melhoria das condições de trabalho, como proteção contra o sol, hidratação adequada e intervalos de descanso suficientes. As diferenças significantes nos níveis de cistatina C entre trabalhadores com função renal alterada ou reduzida e trabalhadores com função renal normal sugerem que a cistatina C poderia ser uma medida útil para a detecção precoce da doença renal.

A retrospective analysis to estimate trough concentrations of teicoplanin in patients with suspected or documented Gram-positive infections

Abstract Teicoplanin is a glycopeptide antibiotic commonly used to treat Gram-positive bacterial infections in the clinic. The aim of this study was to provide a therapeutic reference for the clinical application and dosage regimen adjustment of teicoplanin by identifying factors associated with its plasma trough concentration (Ctrough). A retrospective study was performed on patients with suspected or documented Gram-positive infections who were hospitalized from November 2017 to January 2020 and treated with teicoplanin while undergoing routine therapeutic drug monitoring (TDM). A total of 112 Ctrough trough measurements were obtained from 72 patients were included in this study. SPSS software was used for correlation analysis and receiver operator characteristic curve (ROC) analysis. The Ctrough for teicoplanin showed statistically significant relationships (P<0.05) with PLT, Scr, CLcr, eGFR, BUN and Cys-C. ROC curve analysis revealed that CLcr and eGFR were more sensitive and specific for Ctrough compared to the other factors. These findings should be considered in the clinical application of teicoplanin and for its dosage adjustment.

Association of serum lipoproteins and inflammatory parameters derived from the blood test with renal function in COVID-19 outpatients

Abstract Changes in lipoprotein metabolism are among the main causes of hemodynamic impairment in renal function. COVID-19 is an multisystemic inflammatory disease, aggravating this situation. This cross-sectional study investigated the relationship of serum lipoprotein profile with inflammatory parameters and renal function in 95 COVID-19 outpatients in comparison with 173 with flu-like symptoms. Serum samples were collected for the determination of total cholesterol and fractions, apolipoproteins (Apo A-I and Apo B), urea (sUr) and creatinine (sCr). The glomerular filtration rate (eGFR) was calculated. Neutrophil/lymphocyte (NLR) and platelet/lymphocyte (PLR) ratios were calculated as inflammatory parameters derived from the blood tests. COVID-19 patients presented lower high-density lipoprotein cholesterol (HDL-c) (47.90 ± 1.543 vs. 51.40 ± 0.992) and higher PLR (190.9 ± 9.410 vs. 137.6 ± 5.534) and NLR (3.40 ± 0.22 vs. 2.80 ± 0.15). Both NLR and PLR correlated with each other (r = 0.639). Furthermore, the Apo B/Apo A-I ratio was correlated with PLR (r = 0.5818) and eGFR (r = -0.2630). COVID-19 patients classified as at high risk of developing acute myocardial infarction based on the Apo B/ Apo A-I ratio had higher values for sUr/sCr. Thus, serum apolipoproteins, PLR, and NLR could be related to renal dysfunction in COVID-19.

Validation of equations to estimate kidney function with and without adjustment by race/color in Brazilian adults (ELSA-Brazil) / Validação das equações para estimativa da função renal com e sem ajuste por raça/cor em adultos brasileiros (ELSA-Brasil)

ABSTRACT Objective: To evaluate accuracy and agreement between creatinine clearance (CrCl) measured in 12-h urine and glomerular filtration rate (GFR) calculated by the Modification of Diet in Renal Disease (MDRD-4) and the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) formulas, with and without adjustment for race/color. Methods: Baseline data from the Longitudinal Study of Adult Health (ELSA-Brazil) in adults (35-74 years of age) of both genders were used. Serum creatinine was measured in fasting blood and urinary creatinine was measured in an overnight 12-h urine collect. The agreement between CrCl and the calculated GFR was analyzed by the Bland-Altman method. One-way analysis of variance (ANOVA) with race/color factor was used to verify differences between means of CrCl and GFR with and without correction for race/color. Statistical significance was accepted for p<0.05. Results: From 15,105 participants in the ELSA-Brazil, 12,813 had a validated urine collect. The Bland-Altman diagrams showed that formulas and CrCl agree with each other with a better accuracy for GFR <90 mL/.min x 1.73m2. The adjustment by race/color increased data dispersion. In this range, one-way ANOVA of CrCl with race/color factor showed similarity between groups (p=0.27). Conclusion: MDRD-4 and CKD-EPI are useful formulas for screening cases of chronic kidney disease, and correction by race/color, only in blacks or in black and brown subjects, proved to be unnecessary and reduced the reliability of the equations.

RESUMO Objetivo: Avaliar a acurácia e a concordância entre o clearance de creatinina (ClCr) medido na urina de 12 h e a taxa de filtração glomerular (TFG) calculada pelas fórmulas Modification of Diet in Renal Disease (MDRD-4) e Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI), com e sem ajuste por raça/cor. Métodos: Foram usados dados da linha de base do Estudo Longitudinal de Saúde do Adulto (ELSA-Brasil), em adultos (35-74 anos) de ambos os sexos. A creatinina sérica foi medida no sangue em jejum e a creatinina urinária foi medida na urina de 12 h coletada no período noturno. A concordância entre o ClCr e a TFG calculada pelas fórmulas foi analisada pelo método de Bland-Altman. Análise de variância (ANOVA) de uma via com fator raça/cor foi usada para comparar médias do ClCr e da TFG calculadas com e sem ajuste por raça/cor. A significância estatística foi aceita para p<0,05. Resultados: Dos 15.105 participantes do ELSA-Brasil, 12.813 tiveram a coleta urinária de 12 h validada. Os diagramas de Bland-Altman mostraram que as fórmulas e o ClCr concordam entre si e têm melhor acurácia para TFG <90 mL/min/1,73m2, e que o ajuste por raça/cor aumenta a dispersão dos dados. Nessa faixa, a ANOVA de uma via do ClCr com fator raça/cor mostrou semelhança entre grupos (p=0,27). Conclusão: MDRD-4 e CKD-EPI são fórmulas adequadas para rastreamento da doença renal crônica na população brasileira, sendo desnecessário o ajuste por raça/cor para o uso desses instrumentos, uma vez que a introdução do ajuste tanto em pretos quanto em pretos e pardos diminuiu a acurácia dos métodos.

Tasa de filtración glomerular como estimador de la hipertensión en enfermedades renales y cardiovasculares / Glomerular filtration rate as an estimator of renal and cardiovascular diseases such as hypertension

Introducción: Las fórmulas para la estimación de la tasa de filtración glomerular son fundamentales para estimar el curso de enfermedades renales; incluso ha sido de gran ayuda para obtener datos de prevalencia. Las ecuaciones comparadas con otros métodos son una forma económica y rápida para dar una estimación de la función renal. Objetivo: Describir la utilización de diferentes fórmulas para calcular la tasa de filtración glomerular relacionada con la hipertensión arterial y otras patologías renales y cardiovasculares. Metodología: Se realizó la búsqueda de artículos de investigación en bases de datos como PubMed, Science-Direct, Embase y otras, se estableció un tiempo de publicación entre los años 2018-2022 y se seleccionaron 42 artículos científicos relacionados con el tema. Resultados: La hipertensión arterial es una situación que incrementa el riesgo tanto de enfermedad cardiovascular como de deterioro de la función renal, por lo que en los pacientes hipertensos se espera una relación estrecha en la expresión de ambas patologías. Existen factores que alteran los valores de la creatinina sérica como la dieta, el ejercicio, la edad, el género, la masa muscular, enfermedades musculares y medicamentos. El impacto de la hipertensión en la función renal está descrito además de la relación entre el deterioro de la función renal y el incremento del riesgo cardiovascular; es por esto que en los últimos años la estimación de la función renal se ha incorporado como un marcador de morbilidad y mortalidad cardiovascular. Conclusiones: La estimación de la tasa de filtración glomerular es importante en varios contextos clínicos, en especial en aquellos pacientes con enfermedades que afectan la función glomerular, la creatinina es el biomarcador más usado a pesar de sus evidentes limitaciones.

Introduction: Formulas for estimating glomerular fil-tration rate are fundamental for estimating the course of renal diseases; they have even been of great help in obtaining prevalence data. Equations compared with other methods are an economical and fast way to give an estimation of renal function. Objective: Describe the use of different formulas to calculate the glomerular filtration rate related to high blood pressure and other kidney or cardiovascular pa-thologies. Methodology: Research articles were searched in da-tabases such as PubMed, Science-Direct, Embase and others, a publication time was established between the years 2018-2022 and 42 scientific articles related to the topic were selected. Results: Arterial hypertension is a situation that in-creases the risk of both cardiovascular disease and re-nal function deterioration, so in hypertensive patients a close relationship in the expression of both pathologies is expected. There are factors that alter serum creati-nine values such as diet, exercise, age, gender, muscle mass, muscle diseases and medications. The impact of hypertension on renal function has been described in addition to the relationship between the deterioration of renal function and the increase in cardiovascular risk; this is why in recent years the estimation of renal func-tion has been incorporated as a marker of cardiovascu-lar morbidity and mortality. Conclusions: The estimation of glomerular filtration rate is important in several clinical contexts, especia-lly in those patients with diseases that affect glomerular function; creatinine is the most widely used biomarker despite its obvious limitations

Cistatina C: la necesidad de su conocimiento en la atención preventiva de daño renal / Cystatin c: the need to know it in the preventive care of kidney damage

El conocimiento y actualización sobre la Cistatina C como marcador de daño renal precoz es en extremo necesario para los profesionales de la salud con vistas a mejorar el diagnóstico temprano de enfermedad renal. Las autoras realizaron una revisión bibliográfica actualizada a través de varios estudios científicos, lo que permitió poder informar que aun cuando para la evaluación de la función renal uno de los marcadores sanguíneos convencionales más utilizados es la creatinina, el estudio sanguíneo de Cistatina C no está sometido a diferentes fuentes de variabilidad biológica, ni a factores dependientes del paciente, por lo que sería idóneo tenerlo en cuenta como marcador de función renal precoz.

Knowledge and updating on Cystatin C as a marker of early kidney damage is extremely necessary for health professionals with a view to improving early diagnosis of kidney disease. The authors carried out an updated bibliographical review through various scientific studies, which allowed us to inform that even when for the evaluation of renal function one of the most widely used conventional blood markers is creatinine, the Cystatin C blood study is not subjected to different sources of biological variability, nor to factors dependent on the patient, so it would be ideal to take it into account as a marker of early renal function.

Association between triglyceride glucose index and impairment of renal function in community-dwelling middle-aged and elderly population / 中华全科医师杂志

Objective:To explore the relationship between the triglyceride glucose (TyG) index and impairment of renal function in community-dwelling middle-aged and elderly population.Methods:A total of 4 988 residents aged ≥45 years undergoing health check-up in Yongshun Health Service Center from January 2016 to December 2021 were enrolled and followed up. According to the quartile of the baseline TyG index, all subjects were divided into Q1, Q2, Q3 and Q4 groups. The medical history, physical examination and laboratory test results were documented. Participants were followed up through regular health check-up until March 31, 2023. The outcomes were rapid decline of estimated glomerular filtration rate (eGFR) (a loss in eGFR>3 ml·min -1·1.73 m -2 per year) and the new-onset of chronic kidney disease (CKD) during the follow-up period. Linear regression model, multivariate logistic regression model, restricted cubic spline fitting logistic regression model and ROC curve analysis were used to analyze the association between the TyG index and the impairment of renal function. Results:Among 4 988 residents, 1 396 (28.0%) were males and the age was (59.76±6.28) years. There were 1 247 participants in Q1, Q2, Q3 and Q4 groups, respectively. After 56 months of follow-up, the incidence of rapid eGFR decline and new-onset CKD was 21.9% (1 294/4 988) and 4.0% (200/4 988), respectively. Multivariate logistic regression model analysis showed that TyG index was correlated positively with rapid eGFR decline and new-onset of CKD ( OR=1.34, 95%CI: 1.17-1.52, P<0.001, and OR=1.57, 95%CI:1.19-2.06, P=0.001). Taking group Q1 as a reference, higher levels of TyG index ( Q2, Q3 and Q4 groups) was an independent risk factor for rapid eGFR decline ( P<0.05), which has a dose-response relationship (for trend P=0.002). Compared with the lowest quartile, the adjusted OR of new-onset CKD in the highest quartile was 1.85 ( 95%CI:1.13-3.03, P=0.014). The results of restricted cubic spline fitting logistic regression analysis showed a linear association between TyG index and both outcomes (both P>0.05). The area under ROC curve ( AUC) of the TyG index for predicting the two adverse outcomes were 0.536 ( 95%CI: 0.516-0.556, P<0.001) and 0.588 ( 95%CI:0.548-0.627, P<0.001), respectively. Conclusion:The elevated levels of TyG index may be used as an independent predictor of rapid eGFR decline and new-onset CKD.