ABSTRACT
Abstract Hepatic steatosis, or fatty liver disease, occurs due to the accumulation of lipids in hepatocytes. When it becomes chronic, lobular inflammation develops and the disease can evolve to hepatic fibrosis, liver cirrhosis, or hepatocellular carcinoma. Early diagnosis is desirable because patients diagnosed in the early stage of the disease respond better to treatment. In the early stages of fatty liver disease, the physical examination is often unremarkable. Fatty liver disease and hepatic fibrosis can be diagnosed and monitored through laboratory tests, imaging, and biopsy. Among the imaging methods, ultrasound stands out as an effective means of diagnosing and following patients with liver disease. Ultrasound used in conjunction with elastography (ultrasound elastography) has recently shown great utility in the follow-up of such patients. Ultrasound elastography studies the degree of deformation (stiffness) of an organ or lesion, so that when there is hardening, fibrosis, or cirrhosis of the liver, those alterations are well demonstrated. In this review article, we discuss the application of the different types of ultrasound elastography for liver studies: transient elastography, point shear wave elastography, and two-dimensional shear wave elastography. Although magnetic resonance elastography may also be used in the analysis of liver fibrosis, it will not be addressed in this article.
Resumo Esteatose hepática ocorre pelo acúmulo de lipídios nos hepatócitos, sua cronificação cursa com inflamação lobular e evolui com fibrose hepática, cirrose e carcinoma hepatocelular. O diagnóstico precoce do acometimento hepático é desejável em razão da melhor resposta terapêutica dos pacientes na fase inicial da doença. O exame físico nas fases iniciais da doença não apresenta alterações. O diagnóstico e o controle evolutivo da esteatose e fibrose hepática podem ser realizados por exames laboratoriais, exames de imagens e biópsia. Entre os exames de imagem, destaca-se a ultrassonografia (US) no diagnóstico e acompanhamento dos pacientes com doença hepática. Atualmente, a US associada à elastografia vem se destacando para acompanhamento desses pacientes. A elastografia por US estuda o grau de deformação (ou dureza) do órgão ou lesão, de modo que quando há endurecimento do fígado, por fibrose ou cirrose, essa alteração é bem demonstrada na elastografia por US. Neste artigo de revisão nos propusemos a discutir a aplicação dos diversos tipos de elastografia por US para estudo do fígado: elastografia transitória, point-shear wave elastography e 2D-shear wave elastography. A elastografia por ressonância magnética também pode ser utilizada na análise de fibrose hepática, mas não será abordada neste artigo.
ABSTRACT
The nonalcoholic fatty liver disease (NAFLD) affects approximately 20%-30% of general population and is even more prevalent among obese individuals. The risk factors mainly associated with NAFLD are diseases related to the metabolic syndrome, genetics and environment. In this review, we provide a literature compilation evaluating the evidence behind dietary components, including calories intake, fat, protein, fibers and carbohydrate, especially fructose which could be a trigger to development and progression of the NAFLD. In fact, it has been demonstrated that diet is an important factor for the development of NAFLD and its association is complex and extends beyond total energy intake.
Subject(s)
Diet/adverse effects , Energy Intake , Non-alcoholic Fatty Liver Disease/etiology , Disease Progression , Humans , Risk FactorsABSTRACT
ABSTRACT The nonalcoholic fatty liver disease (NAFLD) affects approximately 20%-30% of general population and is even more prevalent among obese individuals. The risk factors mainly associated with NAFLD are diseases related to the metabolic syndrome, genetics and environment. In this review, we provide a literature compilation evaluating the evidence behind dietary components, including calories intake, fat, protein, fibers and carbohydrate, especially fructose which could be a trigger to development and progression of the NAFLD. In fact, it has been demonstrated that diet is an important factor for the development of NAFLD and its association is complex and extends beyond total energy intake.
RESUMO A doença hepática gordurosa não alcoólica (DHGNA) afeta aproximadamente de 20% a 30% da população geral sendo prevalente entre os indivíduos obesos. Os fatores de risco associados à DHGNA são: doenças relacionadas à síndrome metabólica, fatores genéticos e meio ambiente. Nesta revisão, fornecemos uma compilação bibliográfica avaliando como as evidências relacionadas aos componentes da dieta, incluindo ingestão calórica, de gorduras, de proteínas, de fibras e de carboidratos, especialmente a frutose, poderiam ser um estímulo para o desenvolvimento e progressão da DHGNA. Foi demonstrado que a dieta é um fator importante para o desenvolvimento da DHGNA e sua associação se estende além do consumo total de calorias.
Subject(s)
Humans , Energy Intake , Diet/adverse effects , Non-alcoholic Fatty Liver Disease/etiology , Risk Factors , Disease ProgressionABSTRACT
Objective: To investigate the role of hypocaloric high-protein diet, a prospective clinical study was conducted in NAFLD patients. Research methods and procedures: Pre-versus post-interventional data were analyzed in 48 stable NAFLD patients (submitted to a hypocaloric high-protein diet during 75 days. Variables included anthropometrics (body mass index/ BMI and waist circumference/WC), whole-body and segmental bioimpedance analysis and biochemical tests. Diet compliance was assessed by interviews every two weeks. Results: BMI, WC and body fat mass remained relatively stable (-1.3%, -1.8% and -2.5% respectively, no significance). HDL- cholesterol increased (P < 0.05) whereas total, LDL and VLDL cholesterol, triglycerides, aspartate aminotransferase/AST, gamma glutamyltransferase/GGT, alkaline phosphatase/AP, fasting blood glucose and glycated hemoglobin/ HbA1c decreased (P < 0.05). When patients were stratified according to increase (22/48, 45.8%) and decrease (21/48, 43.8%) of BMI, association between weight decrease and liver benefit could be elicited in such circumstances for ALT, AP and AST/ALT ratio. No change could be demonstrated in patients who gained weight. Multivariate assessment confirmed that waist circumference, ferritin, triacylglycerol, and markers of glucose homeostasis were the most relevant associated with liver enzymes. Discussion: Ours results are consistent with the literature of calorie restriction in the management of NAFLD. Changes in lifestyle and weight loss are recommended for NAFLD patients. European guidelines also support this recommendation. Conclusion: This is the first study that demonstrated that a high protein, hypocaloric diet were associated with improvement of lipid profile, glucose homeostasis and liver enzymes in NAFLD independent on BMI decrease or body fat mass reduction (AU)
Objetivo: Para investigar el papel de la dieta hipocalórica rica en proteínas, se realizó un estudio clínico prospectivo en pacientes con HPGNA. Métodos de investigación y procedimientos: Se analizaron los datos antes y después de la intervención en 48 pacientes con HPGNA estable, sometidos a una dieta hipocalórica y rica en proteínas durante 75 días. Las variables incluían medidas antropométricas (índice de masa corporal (IMC) y circunferencia de la cintura (CC)), análisis de bioimpedancia corporal completa y segmentaria y pruebas bioquímicas. El cumplimiento de la dieta se evaluó mediante entrevistas quincenales. Resultados: El IMC, la CC y la masa grasa corporal permanecieron relativamente estables (-1,3 %, -1,8 % y -2,5%, respectivamente, sin significación). Las HDL-colesterol aumentaron (P < 0,05) mientras que el colesterol total, las LDL y las VLDL, los triglicéridos, la aspartato aminotransferasa (AST), la gamma glutamiltransferasa (GGT), la fosfatasa alcalina (FA), la glucemia en ayunas y la hemoglobina glucosilada (HbA1c) disminuyeron (P < 0,05). Cuando se estratificó a los pacientes en función del aumento (22/48, 45,8 %) o descenso (21/48, 43,8 %) del IMC, se pudo observar una asociación entre la pérdida de peso y el beneficio hepático reflejado en la ALT, la FA y el cociente AST/ALT. No se pudo demostrar ningún cambio en los pacientes que ganaron peso. La evaluación multivariada confirmó que la circunferencia de la cintura, la ferritina, el triacilglicerol y los marcadores de la homeostasis de la glucosa eran los que más relevantemente se asociaban con las enzimas hepáticas. Discusión: Nuestros resultados son consistentes con la bibliografía relativa a la restricción calórica en el manejo de la HPGNA. Los cambios en el estilo de vida y la pérdida de peso se recomiendan en los pacientes con HPGNA. Las guías europeas también apoyan esta recomendación. Conclusión: Éste es el primer estudio que demuestra que una dieta rica en proteínas se asocia con la mejora del perfil lipídico, la homeostasis de la glucosa y las enzimas hepáticas en la HPGNA independientemente del descenso del IMC o la reducción de la masa grasa corporal (AU)
Subject(s)
Humans , Fatty Liver/diet therapy , Dietary Proteins/administration & dosage , Diet, Carbohydrate-Restricted , Biomarkers/analysis , Enzymes/analysis , Weight LossABSTRACT
Liver transplantation is the standard of care for acute and chronic end-stage liver disease. Advances in medical therapy and surgical techniques have transformed the long-term survival of liver-transplant (LT) recipients. The prevalence of post-transplant cardiovascular complications has been rising with increased life expectancy after liver transplantation. Currently, deaths related to cardiovascular complications are one of the main causes of long-term mortality in LT recipients, as cardiovascular disease is the reason of 19-42% of non-liver-related mortality after transplant. On the other hand, metabolic syndrome is common among LT recipients before and after transplantation. In fact, their components (abdominal obesity, diabetes mellitus, hypertension and dyslipidemia) are often exacerbated by transplant-specific factors, such as immunosuppression, inappropriate diet, smoking and a sedentary lifestyle, and add a significant risk of developing atherosclerosis. These aspects are discussed in this article.
