Protocolo de Manejo de Cirugía Metabólica y Bariátrica del Hospital de Especialidades Carlos Andrade Marín / Management Protocol for Metabolic and Bariatric Surgery at the Carlos Andrade Marín Specialties Hospital

1. INTRODUCCIÓN. La obesidad mórbida es una enfermedad crónica multifactorial asociada a complicaciones físicas y psicológicas que empeoran la calidad de vida de los pacientes y disminuyen su esperanza de vida; es un problema sanitario de primera magnitud debido al incremento de esta patología en Ecuador y a las dificultades que entraña su prevención y tratamiento. La cirugía de la obesidad es compleja, no exenta de complicaciones, cuyo objetivo es reducir de manera significativa las comorbilidades asociadas y mejorar el bienestar de los pacientes, cuya técnica quirúrgica sea fácil de reproducir, con porcentajes de revisión bajos y que constituya un tratamiento eficaz y seguro para la obesidad clínicamente grave, con evidencia que demuestra reducción de la mortalidad por todas las causas, mejoría en la expectativa y calidad de vida de los pacientes1.

1. INTRODUCTION. Morbid obesity is a multifactorial chronic disease associated with physical and psychological complications that worsen the quality of life of patients and decrease their life expectancy; it is a health problem of the first magnitude due to the increase of this pathology in Ecuador and the difficulties involved in its prevention and treatment. Obesity surgery is complex, not exempt of complications, whose objective is to significantly reduce associated comorbidities and improve the well-being of patients, whose surgical technique is easy to reproduce, with low revision percentages and that constitutes an effective and safe treatment for clinically severe obesity, with evidence that shows a reduction in all-cause mortality, improvement in life expectancy and quality of life of patients1.

Nutritional genomics, inflammation and obesity

ABSTRACT The Human Genome Project has significantly broadened our understanding of the molecular aspects regulating the homeostasis and the pathophysiology of different clinical conditions. Consequently, the field of nutrition has been strongly influenced by such improvements in knowledge - especially for determining how nutrients act at the molecular level in different conditions, such as obesity, type 2 diabetes, cardiovascular disease, and cancer. In this manner, characterizing how the genome influences the diet and vice-versa provides insights about the molecular mechanisms involved in chronic inflammation-related diseases. Therefore, the present review aims to discuss the potential application of Nutritional Genomics to modulate obesity-related inflammatory responses. Arch Endocrinol Metab. 2020;64(3):205-22

Estudo de parâmetros metabólicos em pacientes não diabéticos com doença hepática gordurosa não alcoólica - importância da dislipidemia / A study of metabolic parameters in non diabetic patients with non alcoholic fatty liver disease - importance of dyslipidemia

ABSTRACT BACKGROUND: Metabolic risk factors of non alcoholic fatty liver disease (NAFLD) in non diabetic teetotallers who constitute a definite group are not well defined. OBJECTIVE: To identify the metabolic risk factors of NAFLD if any in non diabetic subjects who do not consume alcohol. METHODS: In a cross sectional study the effect of metabolic parameters (BMI, individual lipid levels, hemoglobinA1c (HbA1c), HOMA IR and the metabolic syndrome components) of 150 consecutive non diabetic teetotallers (90 with normal glucose tolerance and 60 prediabetics) on their NFS (quantifiable severity parameter of NAFLD) was studied by linear regression analysis. Similar study was done in the normal glucose tolerance and prediabetes groups separately. These parameters were then compared with those of 75 matched diabetic teetotallers with NAFLD. To analyse further the difference between normal glucose tolerance, prediabetic and overt diabetic groups, binary logistic regression of the factors was carried out taking prediabetes and diabetes as outcome variable. RESULTS: All the metabolic parameters were significantly higher in diabetics compared to non diabetics and in prediabetics compared to those with normal glucose tolerance except high-density lipoprotein cholesterol. Triglyceride, high-density lipoprotein cholesterol and BMI significantly predicted NFS in the overall (adjusted R2 68.7%, P=0.000) and normal glucose tolerance groups (adjusted R2 73.2%, P=0.000) whereas BMI, triglyceride, low-density lipoprotein cholesterol and HbA1c did in prediabetics (adjusted R2 89%, P=0.000). The metabolic syndrome was significantly associated with NFS in the overall and prediabetic groups. High triglyceride (odds ratio1.08), low-density lipoprotein cholesterol (odds ratio1.03) and HbA1c (odds ratio 11.54) were positively associated with prediabetes compared to normal glucose tolerance group. CONCLUSION: In nondiabetic teetotallers dyslipidemias are the prime contributors to the development of NAFLD.

RESUMO CONTEXTO: Os fatores de risco metabólicos da doença hepática gordurosa não alcoólica (DHGNA) em abstêmios não diabéticos, que constituem um grupo distinto, não são bem definidos. OBJETIVO: Identificar os fatores de risco metabólicos da DHGNA em indivíduos não diabéticos e que não consumam álcool. MÉTODOS: Em um estudo transversal, o efeito dos parâmetros metabólicos (IMC, níveis de lipídios individuais, HbA1c, Homa IR e os componentes da síndrome metabólica) de 150 abstêmios não diabéticos consecutivos (90 com tolerância à glicose normal e 60 pré-diabéticos) em sua NFS (parâmetro de gravidade quantificável da DHGNA) foram estudados por análise de regressão linear. Um estudo similar em separado foi feito nos grupos normais da tolerância da glicose e do pré-diabetes. Esses parâmetros foram comparados com os de 75 abstêmios diabéticos pareados com DHGNA. Para analisar ainda mais a diferença entre a tolerância à glicose normal foi realizada a regressão logística binária dos fatores tomando pré-diabetes e diabetes como variável de desfecho, nos grupos diabéticos e pré-diabéticos. RESULTADOS: Todos os parâmetros metabólicos foram significativamente maiores nos diabéticos comparados aos não diabéticos e em pré-diabéticos comparados àqueles com tolerância normal à glicose, exceto HDL. Os índices TG, HDL e IMC previram significativamente o NFS no geral nos grupos de tolerância normal (R2 ajustado 68,7%, P=0,000) e de glicose normal (R2 ajustado 73,2%, P=0,000), enquanto o IMC, TG, LDL e HbA1c predisseram em pré-diabéticos (R2 ajustado 89%, P=0,000). A síndrome metabólica foi associada significativamente com o NFS nos grupos totais e pré-diabéticos. O TG elevado (odds ratio 1,08), o LDL (odds ratio 1,03) e a HbA1c (odds ratio 11,54) foram positivamente associados ao pré-diabetes em comparação com o grupo normal de tolerância à glicose. CONCLUSÃO: Em abstêmios não diabéticos as dislipidemias são os principais contribuintes para o desenvolvimento da DHGNA.

Methylation profile of the ADRB3 gene and its association with lipid profile and nutritional status in adults

BACKGROUND: Defects in DNA methylation have been shown to be associated with metabolic diseases such as obesity, dyslipidemia, and hypercholesterolemia. To analyze the methylation profile of the ADRB3 gene and correlate it with lipid profile, lipid intake, and oxidative stress based on malondialdehyde (MDA) and total antioxidant capacity (TAC), homocysteine and folic acid levels, nutritional status, lifestyle, and socioeconomic variables in an adult population. A cross-sectional epidemiological study representative of the East and West regions of the municipality of João Pessoa, Paraíba state, Brazil, enrolled 265 adults of both genders. Demographic, lifestyle, and socioeconomic questionnaires and a 24-h recall questionnaire were applied by trained interviewers' home. Nutritional and biochemical evaluation (DNA methylation, lipid profile, MDA, TAC, homocysteine and folic acid levels) was performed. RESULTS: DNA hypermethylation of the ADRB3 gene, analyzed in leukocytes, was present in 50% of subjects and was associated with a higher risk of being overweight (OR 3.28; p = 0.008) or obese (OR 3.06; p = 0.017), a higher waist-hip ratio in males (OR 1.17; p = 0.000), greater intake of trans fats (OR 1.94; p = 0.032), higher LDL (OR 2.64; p = 0.003) and triglycerides (OR 1.81; p = 0.031), and higher folic acid levels (OR 1.85; p = 0.022). CONCLUSIONS: These results suggest that epigenetic changes in the ADRB3 gene locus may explain the development of obesity and non-communicable diseases associated with trans-fat intake, altered lipid profile, and elevated folic acid. Because of its persistence, DNA methylation may have an impact in adults, in association with the development of non-communicable diseases. This study is the first population-based study of the ADRB3 gene, and the data further support evaluation of ADRB3 DNA methylation as an effective biomarker.

Obesity and kidney disease / Obesidade e doença renal

Abstract Obesity has been pointed out as an important cause of kidney diseases. Due to its close association with diabetes and hypertension, excess weight and obesity are important risk factors for chronic kidney disease (CKD). Obesity influences CKD development, among other factors, because it predisposes to diabetic nephropathy, hypertensive nephrosclerosis and focal and segmental glomerulosclerosis. Excess weight and obesity are associated with hemodynamic, structural and histological renal changes, in addition to metabolic and biochemical alterations that lead to kidney disease. Adipose tissue is dynamic and it is involved in the production of "adipokines", such as leptin, adiponectin, tumor necrosis factor-α, monocyte chemoattractant protein-1, transforming growth factor-β and angiotensin-II. A series of events is triggered by obesity, including insulin resistance, glucose intolerance, dyslipidemia, atherosclerosis and hypertension. There is evidence that obesity itself can lead to kidney disease development. Further studies are required to better understand the association between obesity and kidney disease.

Resumo Obesidade tem sido apontada como uma importante causa de doenças renais, incluindo a doença renal crônica (DRC). A obesidade influencia o desenvolvimento de DRC, entre outros fatores, porque predispõe à nefropatia diabética, nefroesclerose hipertensiva e glomeruloesclerose segmentar e focal. O excesso de peso e a obesidade estão associados a alterações renais hemodinâmicas, estruturais e histológicas, além de alterações metabólicas e bioquímicas que levam à doença renal. O tecido adiposo é dinâmico e está envolvido na produção de "adipocinas", como a leptina, adipnectina, fator de necrose tumoral-α, proteína quimiotática de monócitos-1, fator de transformação do crescimento-β e angiotensina-II. Uma série de eventos é desencadeada pela obesidade, incluindo resistência à insulina, intolerância à glicose, dislipidemia, aterosclerose e hipertensão. Há evidência de que a obesidade por si só pode levar ao desenvolvimento de doença renal. Mais estudos são necessários para melhor entender a associação entre obesidade e doença renal.

Relação entre consumo alimentar de vitaminas e minerais, índice de massa corporal e circunferência da cintura: um estudo de base populacional com adultos no Sul do Brasil / Relationship between dietary consumption of vitamins and minerals, body mass index, and waist circumference: a population-based study of adults in southern Brazil / Relación entre consumo alimentario de vitaminas y minerales, índice de masa corporal y circunferencia de la cintura: un estudio de base poblacional con adultos en el sur de Brasil

Resumo: O objetivo do estudo foi investigar a associação entre o consumo alimentar inadequado de micronutrientes e indicadores de obesidade geral e abdominal. Análise transversal, da segunda onda do estudo longitudinal EpiFloripa Adultos, incluindo 1.222 indivíduos de 22-63 anos, residentes em Florianópolis, Santa Catarina, Sul do Brasil. Os dados de consumo alimentar foram obtidos mediante aplicação de dois recordatórios de 24 horas, sendo o consumo habitual e as prevalências de inadequação no consumo de cálcio, ferro, zinco, e das vitaminas A, C, D e E estimadas conforme as recomendações do Instituto de Medicina e do Conselho Nacional de Pesquisa dos Estados Unidos. O estado nutricional de obesidade geral foi determinado considerando-se valores do índice de massa corporal (IMC), e a obesidade abdominal, considerando-se valores da circunferência da cintura (CC). Para a maioria dos micronutrientes investigados (cálcio, vitaminas A, C, D e E), as médias de consumo mostraram-se aquém dos valores recomendados, com prevalências elevadas de inadequação para toda a amostra. Somente a inadequação no consumo de vitamina C foi maior entre indivíduos obesos (geral ou abdominal). Além disso, associação inversa foi observada entre o menor consumo de cálcio e ferro com valores maiores do IMC e da CC, e entre o menor consumo das vitaminas A e D com valores maiores da CC (β = -0,92cm; IC95%: -1,76; -0,08 e β = -0,69cm; IC95%: -1,32; -0,06, respectivamente), principalmente entre adultos jovens. Foi possível identificar a existência de associação inversa entre o consumo alimentar inadequado de micronutrientes e o estado nutricional de obesidade geral e abdominal também em uma amostra de adultos residentes no Sul do Brasil.

Abstract: The study's objective was to investigate the association between inadequate dietary consumption of micronutrients and indicators of general and abdominal obesity. Cross-sectional analysis of the second wave of the EpiFloripa Adults longitudinal study, including 1,222 individuals, aged 22-63 years and residing in Florianópolis, Santa Catarina State, Southern Brazil. Food consumption data was obtained from two 24-hour food recalls, and habitual consumption and prevalence rates of inadequate consumption of calcium, iron, zinc, and vitamins A, C, D, and E were estimated according to the Institute of Medicine and National Research Council guidelines. General obesity was defined based on the body mass index (BMI) values and abdominal obesity was based on waist circumference (WC) values. For most of the micronutrients investigated (calcium and vitamins A, C, D, and E), consumption levels were below the recommendations, with high prevalence of inadequate consumption in the sample as a whole. Only inadequate vitamin C intake was higher among obese individuals (general or abdominal). In addition, there was an inverse association between lower consumption of calcium and iron and higher BMI and WC, and between lower consumption of vitamins A and D and higher WC levels (β = -0.92cm; 95%CI: -1.76; -0.08 and β = -0.69 cm; 95%CI: -1.32; -0.06, respectively), especially in young adults. The study showed an inverse association between inadequate dietary consumption of micronutrients and general and abdominal obesity in a sample of adults in Southern Brazil.

Resumen: El objetivo del estudio fue investigar la asociación entre el consumo alimentario inadecuado de micronutrientes e indicadores de obesidad general y abdominal. Métodos: análisis transversal, de la segunda fase del estudio longitudinal EpiFloripa Adultos, incluyendo 1.222 individuos de 22-63 años, residentes en Florianópolis, Santa Catarina, Sur de Brasil. Los datos de consumo alimentario fueron obtenidos mediante aplicación de dos recordatorios de 24 horas, siendo estimados, conforme las recomendaciones del Instituto de Medicina y del Consejo Nacional de Investigación, de los EEUU. El estado nutricional de obesidad general fue determinado considerándose valores del índice de masa corporal (IMC), y la obesidad abdominal, considerándose valores de la circunferencia de la cintura (CC). Para la mayoría de los micronutrientes investigados (calcio, vitaminas A, C, D y E), las medias de consumo fueron menores que las recomendaciones, con prevalencias elevadas de inadecuación para toda la muestra. Solamente la inadecuación en el consumo de vitamina C fue mayor entre individuos obesos (general o abdominal). Además, asociación inversa fue observada entre el menor consumo de calcio e hierro con valores mayores de IMC y de la CC, y entre el menor consumo de vitaminas A y D con valores mayores de la CC (β = -0,92cm; IC95%: -1,76; -0,08 y β = -0,69cm; IC95%: -1,32; -0,06), principalmente entre adultos jóvenes. Fue posible identificar la existencia de asociación inversa entre el consumo alimentario inadecuado de micronutrientes y el estado nutricional de obesidad general y abdominal en una muestra de adultos residentes en el Sur de Brasil.

Somatotype characteristics of normal-weight and obese women among different metabolic subtypes

ABSTRACT Background Obesity is a well known risk factor for the development of metabolic abnormalities. However, some obese people are healthy and on the other hand some people with normal weight have adverse metabolic profile, therefore it can be assumed that there is a difference in physical characteristics amongst these people. The aim of this study was to establish whether there are somatotype differences between metabolically healthy and metabolically obese women who are obese or of normal weight. Subjects and methods Study included 230 women aged 44.76 ± 11.21y. Metabolic status was assessed according to IDF criteria, while somatotype was obtained using Heath & Carter method. Results Significant somatotype differences were observed in the group of women with normal-weight: metabolically healthy women had significantly lower endomorphy, mesomorphy and higher ectomorphy compared to metabolically obese normal-weight women (5.84-3.97-2.21 vs. 8.69-6.47-0.65). Metabolically healthy obese women had lower values of endomorphy and mesomorphy and higher values of ectomorphy compared to ‘at risk’ obese women but the differences were not statistically significant (7.59-5.76-0.63 vs. 8.51-6.58-0.5). Ectomorphy was shown as an important determinant of the favorable metabolic profile (cutoff point was 0.80). Conclusion We concluded that, in addition to fat mass, metabolic profile could be predicted by the structure of lean body mass, and in particular by body linearity.

Resistencia a la insulina en la mujer: ¿cómo y cuándo evaluarla? / Insulin resistance wing women: how and when evaluated?

La obesidad resulta de un desequilibrio entre la ingesta de alimentos y el gasto energético, lo que conduce a una acumulación excesiva de tejido adiposo. El aumento del tejido adiposo principalmente visceral, se ha relacionado con alteración de factores proinflamatorios y antinflamatorios, que junto a los ácidos grasos libres producto de la lipólisis, parecen estar involucrados en el desarrollo de la resistencia a la insulina. La resistencia a la insulina es muy frecuente en pacientes con síndrome de ovario poliquístico. Aunque la causa exacta del síndrome de ovario poliquístico es aún desconocida, una de las hipótesis más aceptadas en su fisiopatología es la resistencia a la insulina e hiperinsulinemia. Se plantea que la obesidad, resistencia a la insulina e hiperinsulinismo están estrechamente relacionadas y cada una de estas patologías afecta a la otra. La resistencia a la insulina contribuye a la fisiopatología de la diabetes mellitus tipo 2 (DM2) y es un marcador de la obesidad, el síndrome metabólico, y las principales enfermedades cardiovasculares. Por tanto, la cuantificación de la resistencia a la insulina es de gran importancia. Se utilizan varios métodos para evaluar la resistencia a la insulina, algunos se basan en el análisis de la glucosa e insulina en condiciones de ayuno, mientras que otros se basan en pruebas dinámicas. Cada uno de estos métodos tiene sus ventajas y limitaciones. Por lo tanto, la elección óptima y el empleo de un método específico dependen de la naturaleza del estudio que se realiza. Métodos directos establecidos para medir la sensibilidad a la insulina in vivo son relativamente complejos. Se necesita la elaboración de un marcador universal en el diagnóstico de resistencia a la insulina que se pueda aplicar en entornos clínicos y ambulatorios. Actualmente, la determinación de insulina plasmática y estimación de resistencia a la insulina no son requeridas en la práctica clínica diaria.

Obesity results from an imbalance between food intake and energy expenditure, which leads to an excessive accumulation of adipose tissue. The increase mainly visceral adipose tissue, has been associated with impaired pro-inflammatory and anti-inflammatory factors, together with the free fatty acid product of lipolysis, appear to be responsible for the development of insulin resistance. The insulin resistance is very common in patients with Polycystic Ovarian Syndrome. Although the exact cause of Polycystic Ovarian Syndrome is still unknown, one of the most commonly accepted hypotheses for underlying pathophysiologic mechanisms is hyperinsulinemia and insulin resistance. It is suggested that obesity, hyperinsulinemia and insulin resistance are closely related and each of these diseases affect the other. The insulin resistance contributes to the pathophysiology of type 2 diabetes mellitus (T2DM) and is a marker of obesity, metabolic syndrome and many cardiovascular diseases. Therefore, quantification of insulin resistance is very important. Some methods rely on steady state analysis of glucose and insulin, whereas others rely on dynamic testing. Each of these methods has distinct advantages and limitations. Thus, optimal choice and employment of a specific method depend on the nature of the studies being performed. Established direct methods for measuring insulin sensitivity in vivo are relatively complex. There is a need for elaboration of a universal marker in the diagnosis of insulin resistance that could be applied in both clinical and ambulatory settings. Currently, measurements of serum insulin and estimates of insulin resistance are not required for routine clinical management.

Arterial blood and end-tidal concentrations of sevoflurane during the emergence from anesthesia in gynecologic patients

OBJECTIVE: The end-tidal concentration of inhalation anesthetics is a clinical indicator for predicting the emergence from anesthesia. This study was conducted to assess the relationship between arterial blood and end-tidal sevoflurane concentrations during emergence. METHODS: Thirty-two female American Society of Anesthesiologists physical status I-II patients receiving general anesthesia for elective gynecologic surgery were included. A fixed dose of 3.5% inspiratory sevoflurane in 6 L min-1 oxygen was maintained until the end of surgery. At 20 and 10 minutes before and 0, 5, 10, 15, and 20 minutes after discontinuing sevoflurane, as well as at the time of eye opening by verbal command, defined as awakening, 1 ml arterial blood was obtained to measure its sevoflurane concentration by gas chromatography. Simultaneous inspiratory and end-tidal concentrations of sevoflurane were detected by an infrared analyzer and tested by Bland-Altman agreement analysis. RESULTS: The arterial blood concentrations of sevoflurane were similar to the simultaneous end-tidal concentrations during emergence: 0.36% (0.10) and 0.36% (0.08) sevoflurane at awakening, respectively. The mean time from discontinuing sevoflurane to eye opening was 15.8 minutes (SD 2.9, range 10-26) and was significantly correlated with the duration of anesthesia (52-192 minutes) (P = 0.006) but not with the body mass index or total fentanyl dose. CONCLUSION: The mean awakening arterial blood concentration of sevoflurane was 0.36%. The time to awakening was prolonged in accordance with the anesthetic duration within 3 hours. With well-assisted ventilation during emergence, the sevoflurane end-tidal concentration was nearly equal to its arterial blood concentration, which could be a feasible predictor for awakening. .

Caracterización del metabolismo óseo mineral en pacientes con enfermedad renal crónica en hemodiálisis en el Servicio de Salud Metropolitano Sur, Santiago de Chile / Bone mineral metabolism in patients with chronic kidney disease on dialysis in Southern Metropolitan Santiago

Background: Chronic Kidney Disease-Mineral and Bone Disorder (CKD-MBD) is a condition of dialysis patients associated with both morbidity and mortality. Management is based on clinical guidelines with goals that are hard to comply with. Aim: To describe and compare biochemical variables associated with this disorder in two different time periods. Material and Methods: Revision of medical records of 814 patients (49% females) dialyzed during 2009 and 1018 patients (48% females), dialyzed during 2012 in Southern Metropolitan Santiago. Information about serum calcium, phosphorus, parathyroid hormone (PTH) and albumin was retrieved. Results: Median PTH values in 2009 and 2012 were 222.5 and 353.5 pg/ml respectively (p < 0.05). The figures for serum calcium corrected by albumin were 9.0 and 8.5 mg/dl respectively (p < 0.05). The figures for phosphorus were 4.7 and 5.0 mg/dl respectively (p < 0.05). The Calcium x Phosphorus product was 41.4 and 42.5 mg²/dl² (p < 0.05). Of note, the proportion patients with serum calcium below recommended levels (< 8.4 mg/dl) increased from 16% to 40% from 2009 to 2012. The proportion of patients with biochemical variables within recommended ranges was lower in 2012 than in 2009. Conclusions: There was a low proportion of patients with bone metabolism parameters within ranges recommended by clinical guidelines. These parameters were worst in 2012.

Chronic intermittent hypoxia increases encoding pigment epithelium-derived factor gene expression, although not that of the protein itself, in the temporal cortex of rats, / Hipóxia intermitente crônica aumenta a expressão gênica, mas não proteica, de pigment epithelium-derived factor no córtex temporal de ratos

Objective: Obstructive sleep apnea syndrome is mainly characterized by intermittent hypoxia (IH) during sleep, being associated with several complications. Exposure to IH is the most widely used animal model of sleep apnea, short-term IH exposure resulting in cognitive and neuronal impairment. Pigment epithelium-derived factor (PEDF) is a hypoxia-sensitive factor acting as a neurotrophic, neuroprotective, and antiangiogenic agent. Our study analyzed performance on learning and cognitive tasks, as well as PEDF gene expression and PEDF protein expression in specific brain structures, in rats exposed to long-term IH. Methods: Male Wistar rats were exposed to IH (oxygen concentrations of 21-5%) for 6 weeks-the chronic IH (CIH) group-or normoxia for 6 weeks-the control group. After CIH exposure, a group of rats were allowed to recover under normoxic conditions for 2 weeks (the CIH+N group). All rats underwent the Morris water maze test for learning and memory, PEDF gene expression and PEDF protein expression in the hippocampus, frontal cortex, and temporal cortex being subsequently assessed. Results: The CIH and CIH+N groups showed increased PEDF gene expression in the temporal cortex, PEDF protein expression remaining unaltered. PEDF gene expression and PEDF protein expression remained unaltered in the frontal cortex and hippocampus. Long-term exposure to IH did not affect cognitive function. Conclusions: Long-term exposure to IH selectively increases PEDF gene expression at the transcriptional level, although only in the temporal cortex. This increase is probably a protective mechanism against IH-induced injury. .

Objetivo: A síndrome da apneia obstrutiva do sono caracteriza-se principalmente por episódios de hipóxia intermitente (HI) durante o sono e associa-se a diversas complicações. A exposição à HI é o mais usado modelo animal de apneia do sono, e protocolos de curta duração causam diversos prejuízos cognitivos e neuronais. Pigment epithelium-derived factor (PEDF, fator derivado do epitélio pigmentado) é um fator neurotrófico, neuroprotetor e antiangiogênico sensível à hipóxia celular. Nosso estudo analisou o desempenho em tarefas cognitivas e de aprendizagem, bem como a expressão do gene PEDF e da proteína PEDF em estruturas cerebrais específicas em ratos expostos a HI de longa duração. Métodos: Ratos Wistar foram expostos a HI (21-5% de oxigênio) durante 6 semanas - o grupo HI crônica (HIC) - ou a normóxia durante 6 semanas - o grupo controle. Após a exposição à HIC, um grupo de ratos foi exposto a normóxia durante 2 semanas (o grupo HIC+N). Todos os animais foram submetidos ao labirinto aquático de Morris para avaliação de memória e aprendizado; avaliou-se também a expressão do gene PEDF e da proteína PEDF no hipocampo e nos córtices frontal e temporal. Resultados: Os grupos HIC e HIC+N apresentaram um aumento de expressão do gene PEDF no córtex temporal, porém sem aumento dos níveis proteicos. A expressão do gene PEDF e da proteína PEDF manteve-se inalterada nas demais estruturas. A exposição de longa duração à HI não afetou a função cognitiva. Conclusões: A exposição de longa duração à HI aumenta seletivamente a expressão do gene PEDF ao nível transcricional, embora apenas no córtex temporal. Esse aumento é provavelmente um mecanismo de proteção contra a HI. .

Effects of chronic stress and high-fat diet on metabolic and nutritional parameters in Wistar rats / Efeitos do estresse crônico e da dieta rica em gordura sobre os parâmetros metabólicos e nutricionais em ratos Wistar

OBJECTIVE: The aim of this study was assess the role of chronic stress on the metabolic and nutritional profile of rats exposed to a high-fat diet. MATERIALS AND METHODS: Thirty-day-old male Wistar rats (70-100 g) were distributed into four groups: normal-diet (NC), chronic stress (St), high-fat diet (HD), and chronic stress/high-fat diet (HD/St). Stress consisted at immobilization during 15 weeks, 5 times per week, 1h per day; and exposure to the high-fat diet lasted 15 weeks. Nutritional and metabolic parameters were assessed. The level of significance was 5%. RESULTS: The HD group had final body weight, total fat, as well as insulin and leptin increased, and they were insulin resistant. The St and HD/St had arterial hypertension and increased levels of corticosterone. Stress blocked the effects of the high-fat diet. CONCLUSION: Chronic stress prevented the appearance of obesity. Our results help to clarify the mechanisms involved in metabolic and nutritional dysfunction, and contribute to clinical cases linked to stress and high-fat diet.

OBJETIVO: Avaliar o papel do estresse crônico sobre parâmetros metabólicos e nutricionais de ratos expostos à dieta rica em gordura. MATERIAIS E MÉTODOS: Ratos Wistar machos (30 dias de idade/70-100 g) foram distribuídos em quatro grupos: dieta-normal (NC), estresse crônico (St), dieta rica em gordura (HD) e estresse crônico/dieta rica em gordura (HD/St). O estresse consistiu em imobilização durante 15 semanas, 5 vezes por semana 1h por dia e a dieta rica em gordura foi oferecida por 15 semanas. Parâmetros nutricionais e metabólicos foram avaliados. O nível de significância foi de 5%. RESULTADOS: HD tiveram peso corpóreo, gordura total e níveis de insulina e leptina aumentados e foram resistentes à insulina. Os grupos St e HD/St manifestaram hipertensão e níveis séricos de corticosterona elevados. O estresse bloqueou os efeitos da dieta. CONCLUSÃO: O estresse impediu o surgimento dela. Nossos resultados ajudam compreender os mecanismos envolvidos na disfunção metabólica e nutricional e contribuem para casos clínicos de estresse e dietas ricas em gorduras.

Anemia de las enfermedades crónicas asociada a obesidad: papel de la hepcidina como mediador central / Hepcidin as a central mediator of anemia of chronic diseases associated with obesity

Recent evidence suggests that obesity-related inflammation may play a central role in hepcidin regulation. Hepcidin is a key regulator ofiron homeostasis and has now been suggested as a central mediator ofiron metabolism disorders involved in the pathogenesis of anemia of chronic disease. In this review, we focus on subclinical inflammation in obesity and its effect on hepcidin levels, as the most plausible explanation for the relationship between anemia of chronic disease and obesity.

Efeito da perda de peso sobre a hemodinâmica renal em portadores da síndrome metabólica / Weight loss improves renal hemodynamics in patients with metabolic syndrome

OBJETIVO: No presente artigo, investigou-se o impacto da redução do peso corporal na excreção urinária de albumina e na depuração da creatinina em indivíduos obesos com síndrome metabólica. MÉTODOS: Trinta e cinco indivíduos foram submetidos à dieta hipocalórica por um período de 12 semanas, visando uma redução mínima de 5% do peso corporal. Os voluntários foram submetidos à avaliação metabólica (teste oral de tolerância à glicose, dosagens de lípides plasmáticos e ácido úrico) e à avaliação de parâmetros hemodinâmicos renais (depuração da creatinina e excreção urinária de albumina), antes (fase 1) e após 12 semanas de dieta hipocalórica (fase 2). RESULTADOS: Após o período de intervenção, os voluntários foram divididos em dois grupos: indivíduos que atingiram o alvo para redução de peso (respondedores: R, n = 14) e pacientes que não atingiram a meta para redução de peso (não-respondedores: NR, n = 21). Indivíduos do Grupo R apresentaram melhora do perfil lipídico, da redução da excreção urinária de albumina (mediana = 162.5 mg/24 horas, variação: 0,8 a 292 mg/24 horas, na fase 1 para 10,4 mg/24 horas, variação: 1,6 a 22,4 mg/24 horas, na fase 2), além de redução significante da depuração da creatinina (121,4 ± 66,5 mL/min. para 92,9 ± 35,6 mL/min., p = 0,001). No Grupo NR, não foram observadas diferenças estatisticamente significantes entre as fases 1 e 2 do estudo. CONCLUSÃO: A redução do peso corporal teve impacto positivo na hemodinâmica renal, reduzindo a excreção urinária de albumina e a hiperfiltração glomerular em indivíduos obesos com síndrome metabólica.

OBJECTIVE: We investigated the impact of weight loss on urinary albumin excretion (UAE) and creatinine clearance in obese patients with metabolic syndrome. METHODS: Thirty-five obese patients undertook a 12-week calorie-restricted diet. The patients underwent a metabolic (oral glucose tolerance test, plasma lipids, and uric acid) and renal hemodynamic evaluations (creatinine clearance and urinary albumin excretion) before (phase 1), and after the 12-week diet (phase 2). RESULTS: After the dietary intervention, the subjects were divided into two groups: patients who achieved the target weight reduction (R: responders, n = 14), and patients who did not (NR: non-responders, n = 21). The patients in Group R showed an improvement in lipid profile, a decrease in UAE (median = 162.5 mg/24 hours, range: 0.8 to 292 mg/24 hours, at phase 1 versus 10.4 mg/24 hours, range: 1.6 to 22.4 mg/24 hours, at phase 2), and a significant reduction in creatinine clearance (121.4 ± 66.5 mL/min. in phase 1 to 92.9 ± 35.6 mL/min. at the end of phase 2, p = 0.001). In Group NR, no statistically significant differences were observed between phases 1 and 2. CONCLUSION: Body weight reduction has a positive impact on renal hemodynamics, decreasing urinary albumin excretion as well as glomerular hyperfiltration in obese patients with metabolic syndrome.

Respuesta al tratamiento periodontal de diabéticos tipo 2 con mal control metabólico y obesos intolerantes a la glucosa, con periodontitis severa / Impact of the periodontal therapy in both clinical and metabolic parameters in type 2 diabetic and prediabetic obese patients with severe periodontitis

Diabetes Mellitus (DM) es un factor de riesgo para periodontitis, a su vez, el control metabólico de los diabéticos se dificulta por la presencia de la infección periodontal, aumentando el riesgo de complicaciones crónicas y eventualmente, la mortalidad por diabetes. Ambas enfermedades se relacionan porque los mediadores de inflamación generados en la infección periodontal y la translocación de bacterias de la cavidad oral a la circulación sistémica, podrían actuar como agravantes de la insulino resistencia y deteriorar el control glicémico. Es evidente que el tratamiento oportuno de la periodontitis mejoraría la calidad de vida de los diabéticos; ayudándolos a alcanzar y mantener un adecuado control metabólico. El presente estudio evaluó el impacto de un protocolo de terapia periodontal en parámetros clínicos y metabólicos de pacientes DM2 y obesos prediabéticos, con el fin de contribuir a la inclusión de los diabéticos descompensados y prediabéticos en tratamientos periodontales exitosos, sin aumentar su riesgo médico. Se seleccionó a 9 individuos con DM2 descompensados y 7 obesos intolerantes a la glucosa, todos con Periodontitis Crónica Generalizada Severa. Los pacientes fueron sometidos a tratamiento periodontal, sin modificar las indicaciones médicas, de acuerdo a un protocolo diseñado por nosotros. Los diabéticos mostraron una leve disminución en la HbA1c a los 6 meses de realizado el tratamiento periodontal, no se registraron complicaciones, ni perdieron su condición de pacientes ambulatorios. La respuesta al tratamiento periodontal, fue similar en ambos grupos, con mejoría en todos los parámetros clínicos. Aunque los resultados obtenidos no son estadísticamente significativos, son muy promisorios.

Diabetes Mellitus (DM) is a risk factor for periodontitis, at the same time, the metabolic control of diabetic patients gets more difficult due to the presence of periodontal infection, increasing the risk of chronic complications and possibly, death by diabetes. It is recognized that both diseases are related because the inflammation factors generated by the periodontitis as well as the oral cavity bacteria in the systemic circulation, may act as aggravating factor for insulin resistance and worsen the glycemic control. It is clear that an opportune treatment of PD would improve the quality of life and the metabolic control of diabetic patients. The objectives of the current paper are to evaluate the impact of the periodontal therapy in both clinical and metabolic parameters in type 2 diabetic and prediabetic obese patients and to demonstrate that uncontrolled diabetics can be treated successfully, without increasing their medical risk. Nine DM2 and 7 glucose intolerant obese patients were selected. All of them suffering severe chronic periodontitis. All patients were treated following a protocol designed by us and medical indications were not modified. The DM2 patients showed approximately a 1 percent decrease in HbA1C after 6 months of the periodontal treatment. No complication was observed and no patient needed major medical assistance. The response to the periodontal treatment was similar in both groups, with a significant improvement in clinical parameters. Although the decrease in HbA1C was not statistically significant, our results are very promising at the clinical setting.

Política Nacional de Segurança Alimentar e Nutricional no Brasil: arranjo institucional e alocação de recursos / Food and nutricion brazilian national policy: institutional arrangement and resource allocation

No Brasil, pesquisas sobre a situação nutricional apontam para a redução da prevalência de desnutrição no país, mas se observa o aumento da prevalência de sobrepeso e de obesidade. Apesar do diagnóstico nutricional positivo, alguns problemas estruturais permanecem, como a elevada concentração de renda, os altos níveis de analfabetismo funcional, a discriminação social e racial e a prevalência de Insegurança Alimentar e Nutricional (INSAN). Está em curso um processo de legitimação e de exigibilidade do Direito Humano a Alimentação Adequada, no Brasil. A própria constituição federal e a Lei Orgânica de SAN (LOSAN), sancionada em 2006, integram um conjunto de regras de ordenamento jurídico do país que, em tese, garantiria uma alimentação saudável e adequada a todos os brasileiros, em consonância com as Diretrizes Voluntárias da FAO e com os tratados internacionais de direitos humanos, aos quais o Brasil é signatário. O objetivo geral do presente estudo é analisar a Política de Segurança Alimentar e Nutricional (PNSAN) em construção no Brasil, discutindo o seu arranjo institucional e a alocação de recursos. A metodologia da pesquisa foi baseada na análise de dados secundários, de documentos oficiais, e na legislação pertinente envolvendo o período de 2003 ao final do ano de 2008. A análise teve como suporte teórico os ensinamentos da Economia Institucional e de Finanças Públicas. Entre os principais resultados destaca-se a conclusão de que a Política de Segurança Alimentar e Nutricional brasileira está constituída. Com as Leis que a embasam tornou-se uma política de Estado e não mais de um Governo, entretanto, um dos tripés de sua "institucionalidade", a Câmara Interministerial criada em 2007, peça-chave no processo de articulação da PNSAN, por sua natureza intersetorial, é, sem dúvida, o órgão mais precário do SISAN. Apesar dessa falha institucional, a política tem recebido apoio econômico substantivo, contudo os recursos estão concentrados em um único programa, importante, mas não estruturante. Programas que garantam o emprego e a produção, passando por qualificação, educação e assistência técnica são inequivocamente essenciais para a garantia do Direito Humano a Alimentação Adequada a todos os brasileiros e portanto deveriam receber maiores quantidades de recursos orçamentários

In Brazil, research on the nutritional situation shows the reduction of the prevalence of malnutrition in the country, but reveals the increased prevalence of overweight and obesity. Although the positive nutritional diagnosis, structural problems remain, such as high income concentration, high levels of functional illiteracy, social and racial discrimination and the prevalence of Food and Nutrition Insecurity. There is an ongoing process of legitimation and enforceability of the Human Right to Adequate Food in Brazil. The federal constitution and the Food and Nutritional Security Law, published in 2006, incorporate a set of rules that, in theory, ensure a healthy and adequate diet to all Brazilians, in line with the FAO Voluntary Guidelines and the international human rights treaties to which Brazil is signatory. The general objective of this study is to analyze the Food and Nutritional Security Policy under construction in Brazil, discussing its institutional arrangement and allocation of resources. The methodology of the research was based on the analysis of secondary data, from official documents, and legislation involving the period of 2003 to 2008. The theoretical analysis was based on the teachings of Institutional Economics and Public Finance. Among the main results there is a conclusion that the Brazilian Food and Nutritional Security Policy is established, with Laws that makes it as a State Policy rather than a government. However, one of the tripods of its "institutions", the "Câmara terministerial" established in 2007, a key element in the articulation of this Policy, is without doubt the most precarious element of the Food and Nutritional Policy system. Despite this institutional failure, the policy has received substantial economic support, however the resources are concentrated in a single program, an important one, but not structural. Programs made to ensure employment and production, through skills, education and technical assistance are clearly essential to ensure the human right to adequate food to all Brazilians and therefore should receive higher amounts of budgetary resources

Adiponectina: elo entre obesidade, resistência à insulina e síndrome do ovário policístico? / Adiponectin: the link between obesity, insulin resistance and polycystic ovary syndrome?

A síndrome do ovário policístico é a endocrinopatia ginecológica mais frequente das mulheres em idade reprodutiva, clinicamente caracterizada pela presença de anovulação crônica hiperandrogênica, hirsutismo e infertilidade. Além das alterações reprodutivas, uma proporção considerável das portadoras da síndrome apresenta anormalidades metabólicas como: resistência à insulina e obesidade, com aumento significativo do risco para o desenvolvimento de intolerância à glicose; diabetes mellitus e doença cardiovascular. No entanto, os mecanismos fisiopatológicos que vinculam a obesidade, a resistência à insulina e os demais distúrbios metabólicos presentes na síndrome do ovário policístico ainda não estão completamente esclarecidos. Estudos recentes sugerem que a adiponectina, uma proteína secretada especificamente pelo tecido adiposo, que apresenta propriedades antiaterogênicas, anti-inflamatórias e sensibilizadora à ação da insulina, poderia apresentar um importante papel integrador na patogênese desses distúrbios metabólicos.

Polycystic ovary syndrome is the most common gynecologic endocrinopathy of reproductive age women. It is clinically characterized by hyperandrogenic chronic anovulation, hisrutism and infertility. In addition to reproductive alterations, a significant proportion of polycystic ovary syndrome women display metabolic abnormalities such as insulin resistance and adiposity, predisposing to greater risk of developing glucose intolerance; diabetes mellitus and cardiovascular disease. However, the physiopathologic mechanisms linking obesity, insulin resistance and the other polycystic ovary syndrome metabolic disturbances are not completely understood. Recent studies suggest that adiponectin, a protein specifically secreted by adipose tissue and which has antiatherogenic, anti-inflammatory and insulin-sensitizing properties, could play an important and integrative role in the pathogenesis of these metabolic disturbances.

The reciprocal interaction between sleep and type 2 diabetes mellitus: facts and perspectives

Type 2 diabetes mellitus is a systemic disease characterized by intolerance to glucose and peripheral resistance to insulin. This endocrine disease affects fundamental mechanisms of the central nervous system and jeopardizes the balance of vital functions such as the cardiovascular and circadian rhythm. The increased prevalence of metabolic disorders in our society is aggravated by endemic voluntary postponement of bedtime and by the current sedentary lifestyle, leading to epidemic proportions of obese people. Diabetes and chronic loss of sleep share the fact that both affect millions and one is detrimental to the other. Indeed, sleep deficits have marked modulatory effects on glucose metabolism and insulin sensitivity and foster metabolic syndrome that culminates in sleep disorders like restless syndrome and sleep apnea, which in turn lead to poor sleep quality. We examine the hypothesis that these two worldwide emerging disorders are due to two interlinked cycles. In our paradigm, we establish an intimate relationship between diabetes and sleep disturbances and postulate possible mechanisms that provide support for this conjecture. In addition, we propose some perspectives about the development of the reciprocal interaction between predictor components of metabolic syndrome and sleep disturbances that lead to poor sleep quality. The ability to predict the development and identify or associate a given mode of sleep disturbance to diabetes would be a valuable asset in the assessment of both. Furthermore, major advances in care coupled with healthy lifestyles can ensure a higher quality of life for people with diabetes.

Prevalencia de obesidad en escolares de enseñanza básica / Prevalence of obesity among basic school children

La obesidad en el niño produce a mediano y largo plazo graves trastornos metabólicos y en forma inmediata tiene serias consecuencias psicológicas. Este estudio se realizó con el propósito de describir la prevalencia de obesidad en la población escolar, comparando sexo, edad y nivel socioeconómico (NSE). Se estudiaron 1.219 niños de un colegio de la comuna de las Condes (colegio A) y 1.030 niños de un colegio de la comuna de San Miguel (colegio B). En todos se registró peso, talla, edad, que varió entre 5,5 y 15,5 años. El estado nutricional se evaluó mediante tablas NCHS peso/edad y talla/edad, calculando el índice peso talla según Durant, definiendo obesidad por un índice igual o mayor a 120. E1 NSE determinado mediante escala de Graffar modificada, aplicada a 83 niños del colegio A y a 129 del colegio B, fue significativamente mejor en el colegio A (p<0,01). La prevalencia de obesidad del colegio A fue 12,63 por ciento y la del colegio B 9,03 por ciento (p<0,05). Se encontró que las mujeres del colegio A en el rango 5,5 a 8,5 años eran las mas obesas. Al comparar los hombres de ambos colegios se encontró un porcentaje mayor de obesidad en el rango de 9 a 12 años en el colegio A (p<0,05). Respecto a la edad, sólo se encontró tendencia a la disminución de la obesidad con la edad, pero esta no fue significativa. Puesto que la obesidad en la edad escolar está fuertemente asociada a la del adulto, este grupo constituye un objetivo adecuado para la prevención y tratamiento de ella