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OBJECTIVES: The prevalence of obesity in the population has increased and excess body adiposity is one of the main nutritional disorders in patients with chronic kidney disease (CKD) on hemodialysis (HD). The objective of this study was to develop equations using anthropometric measurements to predict the total and abdominal body adiposity of patients with CKD on HD. METHODS: This is a cross-sectional study evaluating 323 patients with CKD on HD in city in northeastern Brazil. Measurements and anthropometric indicators were correlated with percentage of body fat (%BF) and visceral fat (VF, in kg) measured by dual energy X-ray absorptiometry. Multiple linear regression models based on different combinations of anthropometric measurements were adjusted to develop the equations, with subsequent cross-validation. RESULTS: Of the 323 patients, 62.2% were male and 46.5% were aged between 40 and 59 years. The equation selected to estimate %BF included weight, height, waist and hip circumferences, and triceps and suprailiac skin folds, presenting high predictive capacity (R2 = 0.771). The equation selected to estimate VF included weight, height, waist circumference, hip circumference, and sum of skin folds (R22 = 0.796). CONCLUSIONS: The proposed equations efficiently predicted the %BF and VF (kg) of patients with CKD on HD, thereby serving as viable indicators in clinical practice.

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Determinar o risco cardiovascular pelo Escore de Framingham em indivíduos hipertensos e/ou diabéticos acompanhados em uma unidade de saúde. Estudo transversal com 141 indivíduos com avaliação de dados sociodemográficos, econômicos, clínicos, nutricionais e laboratoriais e aplicação do Escore de Framingham. A média de idade foi 58,5 ±10,5 anos; 67,4% foram mulheres; prevalência de hipertensão arterial, 79,4%, diabetes mellitus, 46,8%; e ambas as comorbidades, 26,2%. A análise apontou diferença por sexo: mulheres apresentaram maior índice de massa corporal (p=0,002), colesterol total (p=0,047) e lipoproteína de alta densidade (p<0,001). O risco cardiovascular foi: 27%, risco baixo; 35,4%, moderado; e 37,6%, alto. Houve maior predomínio de alto risco cardiovascular nos homens (56,5%). Na estratificação do risco cardiovascular, os fatores relacionados ao alto risco foram: maiores idades (p<0,001), maiores valores de colesterol total (p=0,002) e pressão arterial sistólica (p=0,001), maior prevalência de diabetes mellitus (p=0,041) e menores valores de lipoproteína de alta densidade (p=0,016).

To determine the cardiovascular risk using the Framingham Risk Score in hypertensive and/or diabetic individuals followed-up in a health unit. Cross-sectional study with 141 individuals evaluating sociodemographic, economic, clinical, nutritional, and laboratory data, and application of the Framingham Risk Score. Mean age was 58.5 ±10.5 years; 67.4% were women; the prevalence of hypertension was 79.4%; diabetes mellitus, 46.8%; and both comorbidities, 26.2%. The analysis pointed out difference by sex: women had higher body mass index (p=0.002), total cholesterol (p=0.047), and high-density lipoprotein (p<0.001). Cardiovascular risk was: 27%, low risk; 35.4%, moderate risk; and 37.6%, high risk. There was a higher predominance of high cardiovascular risk in men (56.5%). In the stratification of cardiovascular risk, the factors related to high risk were older age (p<0.001), higher values of total cholesterol (p=0.002) and systolic blood pressure (p=0.001), higher prevalence of diabetes mellitus (p=0.041), and lower values of high-density lipoprotein (p=0.016).

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ABSTRACT Objective: Cardiovascular diseases represent the main cause of death in chronic kidney disease (CKD). We aimed to evaluate the prevalence and association of the hypertriglyceridemia-waist phenotype (HWP) and visceral adiposity index (VAI) with cardiometabolic risk factors (CR) in patients with CKD on hemodialysis (HD). Materials and methods: The study is based on a cross-sectional design with 265 HD patients in two cities in northeastern Brazil. The VAI was calculated considering the variables body mass index (BMI), waist circumference (WC), triglycerides (TG) and high density lipoprotein cholesterol (HDL-c). HWP was defined as the concomitant elevation of WC and TG. The Poisson Regression Model with robust variance estimation was adjusted considering a hierarchical approach for explanatory variables. Prevalence ratios (PR) were also estimated. The level of significance adopted was 5%. Results: In our study HWP and VAI prevalence's were 29.82% and 58.49%, respectively. In the final model, there was an association between VAI and female gender (PR = 1.46; p < 0.0001) and high body fat (% BF) (PR = 1.33; p < 0.0019). HWP was associated with females (PR = 1.80; p = 0.002), alcohol consumption (PR = 1.58; p = 0.033), obesity (PR = 1.89; p = 0.0001), high %BF (PR = 1.76; p = 0.012) and reduced HDL-c (PR = 1.48; p = 0.035). Conclusion: The HWP stood out as the association with more CR factors, representing a promising method for tracking cardiometabolic risk in HD patients, mainly female.

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RESUMO Objetivo: analisar os estudos científicos desenvolvidos sobre a deficiência de vitamina D e a mortalidade por causa cardiovascular nas pessoas com doença renal crônica. Método: Trata-se de uma revisão integrativa da literatura a partir das bases de dados LILACS, Pub Med, Medline e na biblioteca eletrônica SciELO, utilizando os descritores deficiência de vitamina D, mortalidade cardiovascular e doença renal crônica, sendo selecionados 14 artigos para análise. Resultados: A partir da análise dos artigos selecionados, foi possível identificar que a deficiência de vitamina D e a mortalidade cardiovascular são condições muito frequentes em renais crônicos e, por isso, discutem-se hipóteses de que a correção desta deficiência pode exercer efeitos benéficos sobre a doença e mortalidade cardiovascular nessa população. Conclusão: Há uma intrínseca relação entre a carência de vitamina D e a mortalidade cardiovascular. Entretanto, ainda é discutível se a suplementação de vitamina D reduz a mortalidade cardiovascular nos doentes renais crônicos. Tal hipótese precisa ser testada em ensaios clínicos, ensejando a necessidade de se desenvolver mais pesquisas sobre o tema.

RESUMEN Objetivo: analizar los estudios científicos desarrollados sobre la deficiencia de vitamina D y la mortalidad por causa cardiovascular en las personas con enfermedad renal crónica. Método: se trata de una revisión integradora de la literatura a partir de las bases de datos LILACS, PubMed, Medline yen la biblioteca electrónica SciELO, utilizando los descriptores deficiencia de vitamina D; mortalidad cardiovascular y enfermedad renal crónica, siendo seleccionados 14 artículos para el análisis. Resultados: a partir del análisis de los artículos seleccionados, fue posible identificar que la deficiencia de vitamina D y la mortalidad cardiovascular son condiciones muy frecuentes en enfermos renales crónicos y, por ello, se discuten hipótesis de que la corrección de esta deficiencia puede ejercer efectos benéficos sobre la enfermedad y mortalidad cardiovascular en esta población. Conclusión: hay una intrínseca relación entre la carencia de vitamina D y la mortalidad cardiovascular. Sin embargo, aúnes discutible si la suplementación de vitamina D reduce la mortalidad cardiovascular en los enfermos renales crónicos. Tal hipótesis necesita ser probada en ensayos clínicos, fomentando la necesidad de desarrollarse más investigaciones sobre el tema.

ABSTRACT Objective: To analyze scientific studies that have addressed vitamin D deficiency and cardiovascular mortality in people with chronic kidney disease. Method: This is an integrative literature review conducted through the LILACS, PubMed and Medline databases, and through the SciELO electronic library, using the 'vitamin D deficiency', 'cardiovascular mortality' and 'chronic kidney disease' descriptors, with 14 articles being selected for analysis. Results: By analyzing the selected articles, it was possible to identify that vitamin D deficiency and cardiovascular mortality are very common conditions in chronic renal patients and, for this reason, there are hypotheses that correcting this deficiency may have beneficial effects on the disease and cardiovascular mortality in this population. Conclusion: There is an intrinsic relationship between vitamin D deficiency and cardiovascular mortality. However, it is still debatable whether vitamin D supplementation reduces cardiovascular mortality in chronic renal patients. Such hypothesis needs to be tested in clinical trials, which gives cause for the need to develop further research on the theme.

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ABSTRACT Introduction: Excessive salt intake is a risk factor for the development of chronic kidney disease (CKD). Objective: To evaluate the association between estimated glomerular filtration rate (eGFR) and sodium excretion in urine samples of Brazilians of African ancestry. Methods: Cross-sectional, population-based study of 1,211 Brazilians of African ancestry living in Alcântara City, Maranhão, Brazil. Demographic, nutritional, clinical, and laboratory data were analyzed. The urinary excretion of sodium was estimated using the Kawasaki equation. Calculations of eGFR were based on the Chronic Kidney Disease Epidemiology Collaboration equation. Multivariate linear-regression model was used to identify the relationship between sodium excretion and eGFR. Results: Mean age was 37.5±11.7 years and 52.8% were women. Mean urinary excretion of sodium was 204.6±15.3 mmol/day and eGFR was 111.8±15.3 mL/min/1.73m2. According to multivariate linear regression, GFR was independently correlated with sodium excretion (β=0.11; p<0.001), age (β=-0.67; p<0.001), female sex (β=-0.20; p<0.001), and body mass index (BMI; β=-0.09; p<0.001). Conclusions: The present study showed that age, female sex, BMI, and correlated negatively with eGFR. Sodium excretion was the only variable that showed a positive correlation with eGFR, indicating that high levels of urinary sodium excretion may contribute to hyperfiltration with potentially harmful consequences.

RESUMO Introdução: O consumo excessivo de sal é um fator de risco para o desenvolvimento de doença renal crônica (DRC). Objetivo: Avaliar a associação entre taxa de filtração glomerular estimada (eGFR) e excreção urinária de sódio em amostra isolada de urina de brasileiros de ascendência africana. Métodos: Trata-se de um estudo transversal de base populacional que incluiu 1.211 brasileiros de ascendência africana que vivem na cidade de Alcântara, no Maranhão. Foram analisados dados demográficos, nutricionais, clínicos e laboratoriais. A excreção urinária de sódio foi estimada usando a equação de Kawasaki. Os cálculos da TFGe foram realizados por meio da equação do Chronic Kidney Disease Epidemiology Collaboration. O modelo de regressão linear multivariada foi utilizado para identificar a relação entre excreção de sódio e TFGe. Resultados: A idade média foi de 37,5 ± 11,7 anos e 52,8% dos participantes eram mulheres. A média da excreção urinária de sódio, ao invés de excreção urinária média foi de 204,6 ± 15,3 mmol/dia e a TFGe foi de 111,8 ± 15,3 mL/min/1,73 m2. A regressão linear multivariada mostrou que a TFG correlacionou-se independentemente com a excreção de sódio (β = 0,11; p < 0,001), idade (β = -0,67; p < 0,001), sexo feminino (β = -0,20; p < 0,001) e índice de massa corporal (IMC; β = -0,09; p < 0,001). Conclusões: O presente estudo mostrou que idade, sexo feminino e IMC correlcionaram-se negativamente com TFGe. Ao negativamente correlacionados com TFGe. Excreção de sódio foi a única variável que mostrou correlação positiva com TFGe, indicando que a alta excreção urinária de sódio pode determinar um quadro de hiperfiltração, acarretando consequências adversas para a função renal a longo prazo.

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INTRODUCTION: Excessive salt intake is a risk factor for the development of chronic kidney disease (CKD). Objective: To evaluate the association between estimated glomerular filtration rate (eGFR) and sodium excretion in urine samples of Brazilians of African ancestry. METHODS: Cross-sectional, population-based study of 1,211 Brazilians of African ancestry living in Alcântara City, Maranhão, Brazil. Demographic, nutritional, clinical, and laboratory data were analyzed. The urinary excretion of sodium was estimated using the Kawasaki equation. Calculations of eGFR were based on the Chronic Kidney Disease Epidemiology Collaboration equation. Multivariate linear-regression model was used to identify the relationship between sodium excretion and eGFR. RESULTS: Mean age was 37.5±11.7 years and 52.8% were women. Mean urinary excretion of sodium was 204.6±15.3 mmol/day and eGFR was 111.8±15.3 mL/min/1.73m2. According to multivariate linear regression, GFR was independently correlated with sodium excretion (ß=0.11; p<0.001), age (ß=-0.67; p<0.001), female sex (ß=-0.20; p<0.001), and body mass index (BMI; ß=-0.09; p<0.001). CONCLUSIONS: The present study showed that age, female sex, BMI, and correlated negatively with eGFR. Sodium excretion was the only variable that showed a positive correlation with eGFR, indicating that high levels of urinary sodium excretion may contribute to hyperfiltration with potentially harmful consequences.

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INTRODUCTION: Arterial hypertension is a worldwide public health problem and one of the major risk factors for chronic kidney disease development. METHODS: In order to compare the Cockcroft-Gault (CG) equation with serum creatinine and 24-hour creatinine clearance (CrCl) for the screening of reduced renal function, a cross-sectional study of 198 hypertensive patients was undertaken at a basic health unit. The demographic, nutritional, and clinical laboratory data were analyzed. Renal function was assessed by serum creatinine and 24hour CrCl. Glomerular filtration rate (GFR) was also estimated according to Cockcroft-Gault equation. RESULTS: The patients had a mean age of 60.6 ± 11.6 years-old, and 73.7% were female. The prevalence of serum creatinine > 1.2 mg/dL was 7.6% and the prevalence of GFR < 60 mL/minute was 24.2%, when evaluated by the CrCl and CG equation. Reduced GFR was observed in older male patients, with lower body mass index, normal values of fasting blood glucose, and higher levels of serum uric acid and of systolic blood pressure. DISCUSSION: The prevalence of decreased renal function among hypertensive patients varies considerably, depending on the laboratory investigation used. CG-estimated CrCl has shown to be more accurate than serum creatinine for assessing GFR. CONCLUSIONS: CG-estimated CrCl was highly similar to 24-hour CrCl, proving to be a reliable primary care screening test for the early diagnosis of renal impairment in hypertensives.

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INTRODUÇÃO: A hipertensão arterial é um problema de saúde pública mundial e um dos principais fatores de risco para o desenvolvimento da doença renal crônica. MÉTODOS: Com a finalidade de comparar a equação Cockcroft-Gault com a creatinina sérica e o clearance de creatinina (ClCr) na triagem de função renal reduzida, realizouse um estudo transversal com 198 hipertensos de uma unidade básica de saúde. Foram analisados dados demográficos, nutricionais e clínico-laboratoriais. A função renal foi analisada pela creatinina sérica e pelo ClCr em urina de 24 horas. A taxa de filtração glomerular foi também estimada segundo a equação Cockcroft-Gault. RESULTADOS: Os pacientes apresentaram idade média de 60,6 ± 11,6 anos, e 73,7 por cento eram do sexo feminino. A prevalência de creatinina sérica > 1,2 mg/dL foi de 7,6 por cento e da taxa de filtração glomerular < 60 mL/ minutos foi de 24,2 por cento, quando avaliadas pelo ClCr e pela equação Cockcroft-Gault. A filtração glomerular reduzida foi observada em homens mais velhos, com menor índice de massa corporal, valores normais de glicemia de jejum e maiores níveis de ácido úrico e pressão arterial sistólica. DISCUSSÃO: A prevalência de função renal reduzida entre hipertensos varia consideravelmente dependendo da abordagem laboratorial utilizada. O clearance de creatinina, principalmente quando estimado pela equação de Cockcroft-Gault, mostrou ser um marcador mais acurado que a creatinina sérica na avaliação da taxa de filtração glomerular. CONCLUSÕES: A equação Cockcroft-Gault apresentou maior concordância com o clearance de creatinina, provando ser um confiável teste de triagem para o diagnóstico precoce e manejo de hipertensos com função renal reduzida na atenção básica.

INTRODUCTION: Arterial hypertension is a worldwide public health problem and one of the major risk factors for chronic kidney disease development. METHODS: In order to compare the Cockcroft-Gault (CG) equation with serum creatinine and 24-hour creatinine clearance (CrCl) for the screening of reduced renal function, a cross-sectional study of 198 hypertensive patients was undertaken at a basic health unit. The demographic, nutritional, and clinical laboratory data were analyzed. Renal function was assessed by serum creatinine and 24hour CrCl. Glomerular filtration rate (GFR) was also estimated according to Cockcroft-Gault equation. RESULTS: The patients had a mean age of 60.6 ± 11.6 years-old, and 73.7 percent were female. The prevalence of serum creatinine > 1.2 mg/dL was 7.6 percent and the prevalence of GFR < 60 mL/minute was 24.2 percent, when evaluated by the CrCl and CG equation. Reduced GFR was observed in older male patients, with lower body mass index, normal values of fasting blood glucose, and higher levels of serum uric acid and of systolic blood pressure. DISCUSSION: The prevalence of decreased renal function among hypertensive patients varies considerably, depending on the laboratory investigation used. CG-estimated CrCl has shown to be more accurate than serum creatinine for assessing GFR. CONCLUSIONS: CG-estimated CrCl was highly similar to 24-hour CrCl, proving to be a reliable primary care screening test for the early diagnosis of renal impairment in hypertensives.

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FUNDAMENTO: No Brasil, a hipertensão arterial (HA) constitui-se um dos principais fatores de risco para doença renal crônica (DRC). Recomenda-se o monitoramento da filtração glomerular (FG) para avaliação da função renal em hipertensos, posto que sua redução precede o aparecimento de sintomas. OBJETIVO: Avaliar a FG e fatores associados em hipertensos. MÉTODOS: Realizou-se estudo transversal no período de janeiro a junho de 2008, com 297 hipertensos com ou sem diabete melito (DM) tratados em uma unidade básica de saúde em São Luís-MA. Foram incluídos pacientes >20 anos e de ambos os sexos. Avaliaram-se dados sociodemográficos, estado nutricional, FG e microalbuminúria em urina de 24h, controle pressórico e glicêmico, creatinina sérica e lipidograma. RESULTADOS: A idade média foi 60,6 × 11,5 anos com predomínio do sexo feminino (75,1 por cento), sobrepeso/obesidade (65,0 por cento) e circunferência da cintura elevada (60,6 por cento). A prevalência de FG < 60 ml/min foi 24,6 por cento no grupo HA sem DM e 18,3 por cento no HA com DM, sem diferença significante. Para o grupo HA sem DM houve associação apenas da FG reduzida com idade > 65 anos, que permaneceu após ajustamento. Para o grupo HA com DM houve associação da redução da FG com idade > 65 anos, tabagismo e obesidade, porém, após ajustamento, permaneceram idade e tabagismo. CONCLUSÃO: Nestes pacientes, a prevalência de FG < 60 ml/min foi elevada e, após ajustamento, apenas idade > 65 anos e tabagismo apresentaram-se como fatores associados à FG. Isto reforça a necessidade da avaliação sistemática da FG em hipertensos visando a prevenção secundária da doença renal crônica.

BACKGROUND: In Brazil, arterial hypertension (AH) constitutes one of the main risk factors for chronic kidney disease (CKD). The monitoring of glomerular filtration (GF) is recommended for the assessment of kidney function in hypertensive individuals, as GF decrease precedes symptom onset. OBJECTIVE: To assess GF and its associated factors in hypertensive individuals. METHODS: A cross-sectional study was carried out from January to June 2008 in 297 individuals with arterial hypertension (AH) with or without diabetes mellitus (DM), treated at a primary care facility in the city of São Luís, Maranhão. Patients older than 20 years and of both sexes were included in the study. Sociodemographic and nutritional status data, GF rate and microalbuminuria levels in 24-hour urine were assessed, as well as blood pressure, glucose and serum creatinine levels and a lipidogram. RESULTS: Mean age was 60.6 × 11.5 years, with a predominance of the female sex (75.1 percent), overweight/obesity (65.0 percent) and large waist circumference (60.6 percent). The prevalence of GF < 60 ml/min was 24.6 percent in the AH group without DM and 18.3 percent in the AH group with DM, with no significant difference. For the AH group without DM, there was an association only between reduced GF and age > 65 years, which remained after adjustment. For the AH group with DM, there was an association between reduced GF and age > 65 years, smoking habit and obesity. However, after the adjustment, age and smoking habit remained as associated factors. CONCLUSION: In these patients, the prevalence of GF < 60 ml/min was high and after the adjustment, only age > 65 years and smoking habit were shown to be factors associated to GF. This reinforces the need to systematically evaluate GF in hypertensive individuals, aiming at the secondary prevention of chronic kidney disease.

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BACKGROUND: In Brazil, arterial hypertension (AH) constitutes one of the main risk factors for chronic kidney disease (CKD). The monitoring of glomerular filtration (GF) is recommended for the assessment of kidney function in hypertensive individuals, as GF decrease precedes symptom onset. OBJECTIVE: To assess GF and its associated factors in hypertensive individuals. METHODS: A cross-sectional study was carried out from January to June 2008 in 297 individuals with arterial hypertension (AH) with or without diabetes mellitus (DM), treated at a primary care facility in the city of São Luís, Maranhão. Patients older than 20 years and of both sexes were included in the study. Sociodemographic and nutritional status data, GF rate and microalbuminuria levels in 24-hour urine were assessed, as well as blood pressure, glucose and serum creatinine levels and a lipidogram. RESULTS: Mean age was 60.6 x 11.5 years, with a predominance of the female sex (75.1%), overweight/obesity (65.0%) and large waist circumference (60.6%). The prevalence of GF < 60 ml/min was 24.6% in the AH group without DM and 18.3% in the AH group with DM, with no significant difference. For the AH group without DM, there was an association only between reduced GF and age > 65 years, which remained after adjustment. For the AH group with DM, there was an association between reduced GF and age > 65 years, smoking habit and obesity. However, after the adjustment, age and smoking habit remained as associated factors. CONCLUSION: In these patients, the prevalence of GF < 60 ml/min was high and after the adjustment, only age > 65 years and smoking habit were shown to be factors associated to GF. This reinforces the need to systematically evaluate GF in hypertensive individuals, aiming at the secondary prevention of chronic kidney disease.

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