999 resultados para Hepatic failure
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Acute fatty liver of pregnancy is a rare disease that affects women in the third trimester of pregnancy. Although infrequent, the disease can cause maternal mortality. The diagnosis is not always clear until the pregnancy is terminated, and significant complications, such as acute pancreatitis, can occur. Pancreatic involvement typically only occurs in severe cases after the development of hepatic and renal impairment. To date, little knowledge is available regarding how the disease causes pancreatitis. Treatment involves supportive measures and pregnancy interruption. In this report, we describe a case of a previously healthy 26-year-old woman at a gestational age of 27 wk and 6 d who was admitted with severe abdominal pain and vomiting. This case illustrates the clinical and laboratory overlap between acute fatty liver of pregnancy and pancreatitis, highlighting the difficulties in differentiating each disease. Furthermore, the hypothesis for this overlapping is presented, and the therapeutic options are discussed.
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Hepatic encephalopathy (HE) is a functional disorder of the central nervous system (CNS) associated with liver failure, either end-stage chronic liver disease or fulminant hepatic failure. Its pathogenesis remains complex and poorly understood. In view of recent advances in the management of HE, the Brazilian Society of Hepatology endorsed a monothematic meeting regarding HE in order to gather experts in the field to discuss related data and to draw evidence-based recommendations concerning: management of HE and intracranial hypertension in FHF, treatment of episodic HE in cirrhosis, controversies in the management of EH including difficult to treat cases and diagnostic and treatment challenges for minimal HE. The purpose of this review is to summarize the lectures and recommendations made by the panel of experts of the Brazilian Society of Hepatology.
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Background/Purpose: The mechanisms of increased collagen production and liver parenchyma fibrosis are poorly understood. These phenomena are observed mainly in children with biliary obstruction (BO), and in a great number of patients, the evolution to biliary cirrhosis and hepatic failure leads to the need for liver transplantation before adolescence. However, pediatric liver transplantation presents with biliary complications in 20% to 30% of cases in the postoperative period. Intra-or extrahepatic stenosis of bile ducts is frequent and may lead to secondary biliary cirrhosis and the need for retransplantation. It is unknown whether biliary stenosis involving isolated segments or lobes may affect the adjacent nonobstructed lobes by paracrine or endocrine means, leading to fibrosis in this parenchyma. Therefore, the present study aimed to create an experimental model of selective biliary duct ligation in young animals with a subsequent evaluation of the histologic and molecular alterations in liver parenchyma of the obstructed and nonobstructed lobes. Methods: After a pilot study to standardize the surgical procedures, weaning rats underwent ligation of the bile ducts of the median, left lateral, and caudate liver lobes. The bile duct of the right lateral lobe was kept intact. To avoid intrahepatic biliary duct collaterals neoformation, the parenchymal connection between the right lateral and median lobes was clamped. The animals were divided into groups according to the time of death: 1, 2, 3, 4, and 8 weeks after surgical procedure. After death, the median and left lateral lobes (with BO) and the right lateral lobe (without BO [NBO]) were harvested separately. A group of 8 healthy nonoperated on animals served as controls. Liver tissues were subjected to histologic evaluation and quantification of the ductular proliferation and of the portal fibrosis. The expressions of smooth muscle alpha-actin (alpha-SMA), desmin, and transforming growth factor beta 1 genes were studied by molecular analyses (semiquantitative reverse transcriptase-polymerase chain reaction and real-time polymerase chain reaction, a quantitative method). Results: Histologic analyses revealed the occurrence of ductular proliferation and collagen formation in the portal spaces of both BO and NBO lobes. These phenomena were observed later in NBO than BO. Bile duct density significantly increased 1 week after duct ligation; it decreased after 2 and 3 weeks and then increased again after 4 and 8 weeks in both BO and NBO lobes. The portal space collagen area increased after 2 weeks in both BO and NBO lobes. After 3 weeks, collagen deposition in BO was even higher, and in NBO, the collagen area started decreasing after 2 weeks. Molecular analyses revealed increased expression of the alpha-SMA gene in both BO and NBO lobes. The semiquantitative and quantitative methods showed concordant results. Conclusions: The ligation of a duct responsible for biliary drainage of the liver lobe promoted alterations in the parenchyma and in the adjacent nonobstructed parenchyma by paracrine and/or endocrine means. This was supported by histologic findings and increased expression of alpha-SMA, a protein related to hepatic fibrogenesis. (C) 2012 Elsevier Inc. All rights reserved.
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Hyperprolactinemia is a common cause of menstrual disturbances affecting young women. There is a diversity of causes, from physiological, such as pregnancy, to pharmacological and pathological, such as hypothyroidism. Renal and hepatic failure, intercostal nerve stimulation by trauma or surgery, prolactinomas, other tumors in the hypothalamus-pituitary region, as well as macroprolactinemia can also be considered. Identifying the correct cause is important to establish the correct treatment. Should all these causes be ruled out and pituitary imaging revealed as negative, idiopathic hyperprolactinemia is therefore diagnosed. In symptomatic patients, treatment with dopaminergic agonists is indicated. As for the asymptomatic hyperprolactinemic individuals, macroprolactinemia should be screened, and once it is detected, there is no need for pituitary imaging study or for dopaminergic agonist use. (J Clin Endocrinol Metab 97: 2211-2216, 2012)
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Chronic liver inflammation during viral hepatitis is a major health problem worldwide. The role of proinflammatory cytokines, like IL-12, in breaking hepatic immune tolerance, and inducing acute liver inflammation and virus clearance is not clear. Nor is clear its role in uncontrolled severe inflammatory response, leading to fulminant hepatitis and hepatic failure. This work, focused in the study of the role of endogenous produced IL-12 in inducing hepatic inflammatory responses, demonstrates: In vitro, using adenovirus coding for IL-12, that hepatocytes stimulate CD4+ T cells in a tolerogenic manner, and that endogenous IL-12 is able to switch the immune response into Th1; and in vivo, that endogenous IL-12 induces hepatocyte damage and virus elimination in mice infected with adenovirus. In addition, and in order to study in vivo the relevance of IL-12 in acute inflammation, conditional IL-12 transgenic mice expressing IL-12 in the liver after cre-recombinase mediated induction were generated. For this purpose, an IL-12 fusion protein was created, which demonstrated high levels of bioactivity. Induction of IL-12 expression during embryonic development was achieved by crossbreeding with Act-Cre transgenic mice; induction of IL-12 expression in adult mice was achieved by a plasmid coding for the cre-recombinase. This study demonstrates that after induction, IL-12 is expressed in the liver of the transgenic mice. It also demonstrates that hepatic expression of IL-12 induces splenomegaly and liver inflammation, characterized by large infiltrations in portal tracts and veins, associated with hepatic damage, necrosis areas and lethality. Furthermore, constitutive hepatic IL-12 expression does not lead to abortion, but to total lethality, short after delivery. In conclusion, in this study, a transgenic mouse model has been generated, in which the expression of active IL-12 in the liver can be induced at any time; this model will be very helpful for studying hepatic pathologies. This study has also demonstrated that hepatic produced IL-12 is able of breaking liver tolerance inducing inflammation, virus elimination, severe hepatocyte damage, and lethality. These findings suggest IL-12 as a key cytokine in acute liver inflammation and fulminant hepatic failure. 5.1 Future studies Once the importance of IL-12 in inducing hepatic inflammation and virus elimination was demonstrated in this study, understanding the mechanisms of the IL-12 induced liver damage, and more important, how to avoid it will be the main focus in the future. It is very important to achieve hepatic inflammation for a more effective and faster viral elimination, but avoiding the toxicity of IL-12, which leads to massive liver injury and lethality is obviously necessary to allow IL-12 as therapy. For that purpose, future studies will be mainly base on three different points: 1. The determination of different cell populations present in the hepatic infiltration, which of them are responsible for liver injury, and as well their state of activation. 2. The measure of other pro- and anti-inflammatory cytokines and chemokines, which can play a role in IL-12-induced liver inflammation and hepatocyte damage. For these purposes, specific blocking antibodies (anti TNF-alpha, anti IL-12, anti IFN-g) will be used. The study with different transgenic mice: TNF-alpha Receptor knockout, TGF-b, will also help in determining the role of those cytokines during IL-12-induced liver damage and lethality. 3. The establishing of liver pathology models (viral infection, tumours, auto-antigens) in mice. Induction of IL-12 at any time of the pathology development will help in clarifying the role of IL-12 in those models. Finally, the transgenic mice expressing IL-23 in the liver will be generated.
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Dietary supplements (DS) are easily available and increasingly used, and adverse hepatic reactions have been reported following their intake. To critically review the literature on liver injury because of DSs, delineating patterns and mechanisms of injury and to increase the awareness towards this cause of acute and chronic liver damage. Studies and case reports on liver injury specifically because of DSs published between 1990 and 2010 were searched in the PubMed and EMBASE data bases using the terms 'dietary/nutritional supplements', 'adverse hepatic reactions', 'liver injury'; 'hepatitis', 'liver failure', 'vitamin A' and 'retinoids', and reviewed for yet unidentified publications. Significant liver injury was reported after intake of Herbalife and Hydroxycut products, tea extracts from Camellia sinensis, products containing usnic acid and high contents of vitamin A, anabolic steroids and others. No uniform pattern of hepatotoxicity has been identified and severity may range from asymptomatic elevations of serum liver enzymes to hepatic failure and death. Exact estimates on how frequent adverse hepatic reactions occur as a result of DSs cannot be provided. Liver injury from DSs mimicking other liver diseases is increasingly recognized. Measures to reduce risk include tighter regulation of their production and distribution and increased awareness of users and professionals of the potential risks.
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Sclerosing cholangitis in critically ill patients (SC-CIP) with sepsis and acute respiratory distress syndrome (ARDS) is a cholestatic liver disease with a rapid progression to liver cirrhosis and hepatic failure. Data on outcome of these patients after liver transplantation (LT) are sparse.
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INTRODUCTION: Acute fibrinous and organizing pneumonia (AFOP) is a recently described histologic pattern of diffuse pulmonary disease. In children, all cases reported to date have been fatal. In this study, we describe the first nonfatal AFOP in a child and review the literature. DESCRIPTION: A 10-year-old boy developed very severe aplastic anemia (VSAA) after being admitted to our hospital with a fulminant hepatic failure of unknown origin. A chest computed tomography scan revealed multiple lung nodules and a biopsy of a pulmonary lesion showed all the signs of AFOP. Infectious workup remained negative. We started immunosuppressive therapy with antithymocyte globulin and cyclosporine to treat VSAA. Subsequent chest computed tomography scans showed a considerable diminution of the lung lesions but the VSAA did not improve until we performed hematopoietic stem cell transplantation 5 months later. CONCLUSIONS: Aplastic anemia is associated with a variety of autoimmune syndromes. The sequence of events in our patient suggests that the hepatic failure, AFOP, and the VSAA may all have been part of an autoimmune syndrome. AFOP could be the result of immune dysregulation in this pediatric case with favorable outcome after immunosuppressive therapy and hematopoietic stem cell transplantation.
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ntense liver regeneration and almost 100% survival follows partial hepatectomy of up to 70% of liver mass in rodents. More extensive resections of 70 to 80% have an increased mortality and partial hepatectomies of >80% constantly lead to acute hepatic failure and death in mice. The aim of the study was to determine the effect of systemically administered granulocyte colony stimulating factor (G-CSF) on animal survival and liver regeneration in a small for size liver remnant mouse model after 83% partial hepatectomy (liver weight <0.8% of mouse body weight). Methods: Male Balb C mice (n=80, 20-24g) were preconditioned daily for five days with 5μg G-CSF subcutaneously or sham injected (aqua ad inj). Subsequently 83% hepatic resection was performed and daily sham or G-CSF injection continued. Survival was determined in both groups (G-CSF n=35; Sham: n=33). In a second series BrdU was injected (50mg/kg Body weight) two hours prior to tissue harvest and animals euthanized 36 and 48 hours after 83% liver resection (n=3 each group). To measure hepatic regeneration the BrdU labeling index and Ki67 expression were determined by immunohistochemistry by two independent observers. Harvested liver tissue was dried to constant weight at 65 deg C for 48 hours. Results: Survival was 0% in the sham group on day 3 postoperatively and significantly better (26.2% on day 7 and thereafter) in the G-CSF group (Log rank test: p<0.0001). Dry liver weight was increased in the G-CSF group (T-test: p<0.05) 36 hours after 83% partial hepatectomy. Ki67 expression was elevated in the G-CSF group at 36 hours (2.8±2.6% (Standard deviation) vs 0.03±0.2%; Rank sum test: p<0.0001) and at 48 hours (45.1±34.6% vs 0.7±1.0%; Rank sum test: p<0.0001) after 83% liver resection. BrdU labeling at 48 hours was 0.1±0.3% in the sham and 35.2±34.2% in the G-CSF group (Rank sum test: p<0.0001) Conclusions: The surgical 83% resection mouse model is suitable to test hepatic supportive regimens in the setting of small for size liver remnants. Administration of G-CSF supports hepatic regeneration after microsurgical 83% partial hepatectomy and leads to improved long-term survival in the mouse. G-CSF might prove to be a clinically valuable supportive substance in small for size liver remnants in humans after major hepatic resections due to primary or secondary liver tumors or in the setting of living related liver donation.
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Background. Changes in hepatosplanchnic lactate exchange are likely to contribute to hyperlactatemia in sepsis. We hypothesized that septic and cardiogenic shock have different effects on hepatosplanchnic lactate exchange and its contribution to hyperlactatemia. Materials and Methods. 24 anesthetized pigs were randomized to fecal peritonitis (P), cardiac tamponade (CT), and to controls ( per group). Oxygen transport and lactate exchange were calculated during 24 hours. Results. While hepatic lactate influx increased in P and in CT, hepatic lactate uptake remained unchanged in P and decreased in CT. Hepatic lactate efflux contributed 20% (P) and 33% (CT), respectively, to whole body venous efflux. Despite maintained hepatic arterial blood flow, hepatic oxygen extraction did not increase in CT. Conclusions. Whole body venous lactate efflux is of similar magnitude in hyperdynamic sepsis and in cardiogenic shock. Although jejunal mucosal pCO2 gradients are increased, enhanced lactate production from other tissues is more relevant to the increased arterial lactate. Nevertheless, the liver fails to increase hepatic lactate extraction in response to rising hepatic lactate influx, despite maintained hepatic oxygen consumption. In cardiac tamponade, regional, extrasplanchnic lactate production is accompanied by hepatic failure to increase oxygen extraction and net hepatic lactate output, despite maintained hepatic arterial perfusion.
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Mutations in the sister of P-glycoprotein (Spgp) or bile salt export pump (BSEP) are associated with Progressive Familial Intrahepatic Cholestasis (PFIC2). Spgp is predominantly expressed in the canalicular membranes of liver. Consistent with in vitro evidence demonstrating the involvement of Spgp in bile salt transport, PFIC2 patients secrete less than 1% of biliary bile salts compared with normal infants. The disease rapidly progresses to hepatic failure requiring liver transplantation before adolescence. In this study, we show that the knockout of spgp gene in mice results in intrahepatic cholestasis, but with significantly less severity than PFIC2 in humans. Some unexpected characteristics are observed. Notably, although the secretion of cholic acid in mutant mice is greatly reduced (6% of wild-type), total bile salt output in mutant mice is about 30% of wild-type. Also, secretion of an unexpectedly large amount of tetra-hydroxylated bile acids (not detected in wild-type) is observed. These results suggest that hydroxylation and an alternative canalicular transport mechanism for bile acids compensate for the absence of Spgp function and protect the mutant mice from severe cholestatic damage. In addition, the spgp−/− mice display a significant increase in the secretion of cholesterol and phospholipids into the bile. This latter observation in spgp−/− mice suggests that intrahepatic, rather than intracanalicular, bile salts are the major driving force for the biliary lipid secretion. The spgp−/− mice thus provide a unique model for gaining new insights into therapeutic intervention for intrahepatic cholestasis and understanding mechanisms associated with lipid homeostasis.
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INTRODUÇÃO: O transplante hepático é o único tratamento efetivo para uma variedade de doenças hepáticas irreversíveis. No entanto, o número limitado de doadores pediátricos leva ao uso de enxertos hepáticos de doadores adultos, com necessidade de anastomoses vasculares mais complexas. Essas anastomoses tornam-se complicadas pela diferença no calibre dos vasos entre o doador e o receptor, resultando em alterações do fluxo sanguíneo, estenose da anastomose venosa ou arterial e trombose. Os efeitos para regeneração hepática decorrentes da privação do fluxo sanguíneo pela veia porta ou pela artéria hepática não estão completamente elucidados. Experimentalmente, quando um lobo do fígado não recebe o fluxo venoso portal, é observada atrofia deste segmento e hipertrofia do restante do órgão perfundido. Embora existam vários modelos experimentais para estudo da regeneração hepática, poucos são focados em animais em crescimento. Além disso, os efeitos regenerativos de drogas como o tacrolimus e a insulina precisam ser pesquisados, com o objetivo de encontrar um tratamento ideal para a insuficiência hepática ou um método de estimular a regeneração do fígado após ressecções ou transplantes parciais. O objetivo do presente estudo é descrever modelos de regeneração hepática em ratos em crescimento com: 1) ausência de fluxo hepático arterial e 2) redução do fluxo portal. Adicionalmente, o estudo avalia o efeito pró-regenerativo do tacrolimus e da insulina nesses modelos descritos. MÉTODOS: cento e vinte ratos (entre 50 e 100g de peso) foram divididos em 6 grupos, de acordo com o tipo de intervenção cirúrgica: Grupo 1, incisão abdominal sem intervenção hepática; Grupo 2, hepatectomia a 70%; Grupo 3, hepatectomia a 70% + estenose de veia porta; Grupo 4, hepatectomia a 70% + ligadura da artéria hepática; Grupo 5, hepatectomia a 70% + estenose de veia porta + insulina; Grupo 6, hepatectomia a 70% + estenose de veia porta + tacrolimus. Os animais dos grupos 1 ao 4 foram subdivididos em 5 subgrupos de acordo com o momento da morte: 1, 2, 3, 5 e 10 dias após a intervenção cirúrgica. Os animais dos grupos 5 e 6 foram subdividos em 2 subgrupos de acordo com o momento da morte: 2 e 10 dias após a intervenção cirúrgica. Os lobos hepáticos remanescentes foram submetidos à análise histomorfométrica, imuno-histoquímica e molecular. RESULTADOS: Verificou-se que no grupo com hepatectomia a 70% houve recuperação do peso do fígado no terceiro dia com aumento da atividade mitótica, enquanto que no grupo com estenose portal não se observou esse fenômeno (p < 0,001). A insulina e o tacrolimus promoveram aumento do peso do fígado e do índice mitótico. A atividade mitótica foi considerada aumentada nos animais dos grupos hepatectomia, hepatectomia + ligadura da artéria, insulina e tacrolimus; e esse parâmetro estava reduzido no grupo submetido à hepatectomia + estenose portal (p < 0,001). A expressão de interleucina 6 estava presente em todos os animais, sendo significativamente maior nos grupos hepatectomia, hepatectomia + ligadura da artéria e significativamente menor no grupo hepatectomia + estenose portal. Entretanto, a administração de tacrolimus ou insulina recuperou os níveis teciduais de interleucina 6 no grupo com estenose portal. CONCLUSÕES: No presente estudo foi padronizado um modelo simples e facilmente reprodutível para estudar a regeneração hepática em ratos em crescimento com redução do fluxo arterial ou venoso para o fígado. Foi demonstrado que a administração de insulina ou tacrolimus é capaz de reverter os efeitos deletérios da estenose portal na regeneração hepática. A obstrução do fluxo arterial não afetou a capacidade regenerativa hepática
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The close association of excessive alcohol consumption and clinical expression of hemochromatosis has been of widespread interest for many years. In most populations of northern European extraction, more than 90% of patients with overt hemochromatosis are homozygous for the C282Y mutation in the HFE gene. Nevertheless, the strong association of heavy alcohol intake with the clinical expression of hemochromatosis remains. We (individually or in association with colleagues from our laboratories) have performed three relevant studies in which this association was explored. In the first, performed in 1975 before the cloning of the HFE gene, the frequency of clinical symptoms and signs was compared in patients with classical hemochromatosis who consumed 100 g or more of alcohol per day versus in nondrinkers or moderate drinkers who consumed less than 100 g of alcohol per day. The results showed no difference between the two groups except for features of complications of alcoholism in the first group, especially jaundice, peripheral neuritis, and hepatic failure. Twenty-five percent of those with heavy alcohol consumption showed histologic features of alcoholic liver disease (including cirrhosis) together with heavy iron overload. It was concluded that these patients had the genetic disease complicated by alcoholic liver disease. In the second study (2002), 206 subjects with classical HFE-associated hemochromatosis in whom liver biopsy had been performed were evaluated to quantify the contribution of excess alcohol consumption to the development of cirrhosis in hemochromatosis. Cirrhosis was approximately nine times more likely to develop in subjects with hemochromatosis who consumed more than 60 g of alcohol per day than in those who drank less than this amount. In the third study (2002), 371 C282Y-homozygous relatives of patients with HFE-associated hemochromatosis were assessed. Eleven subjects had cirrhosis on liver biopsy and four of these drank 60 g or more of alcohol per day. The reason why heavy alcohol consumption accentuates the clinical expression of hemochromatosis is unclear. Increased dietary iron or increased iron absorption is unlikely. The most likely explanation would seem to be the added co-factor effect of iron and alcohol, both of which cause oxidative stress, hepatic stellate cell activation, and hepatic fibrogenesis. In addition, the cumulative effects of other forms of liver injury may result when iron and alcohol are present concurrently. Clearly, the addition of dietary iron in subjects homozygous for hemochromatosis would be unwise. (C) 2003 Elsevier Inc. All rights reserved.
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BACKGROUND: Endoscopic injection of N-butyl-2-cyanoacrylate is the current recommended treatment for gastric variceal bleeding. Despite the extensive worldwide use, there are still differences related to the technique, safety, and long term-results. We retrospectively evaluated the efficacy and safety of cyanoacrylate in patients with gastric variceal bleeding. PATIENTS AND METHODS: Between January 1998 and January 2010, 97 patients with gastric variceal bleeding underwent endoscopic treatment with a mixture of N-butyl-2-cyanoacrylate and Lipiodol(TM). Ninety-one patients had cirrhosis and 6 had non-cirrhotic portal hypertension. Child-Pugh score at presentation for cirrhotic patients was A-12.1 %; B-53.8 %; C-34.1 % and median MELD score at admission was 13 (3-26). Successful hemostasis, rebleeding rate and complications were reviewed. Median time of follow up was 19 months (0.5-126). RESULTS: A median mixture volume of 1.5 mL (0.6 to 5 mL), in 1 to 8 injections, was used, with immediate hemostasis rate of 95.9 % and early rebleeding rate of 14.4 %. One or more complications occurred in 17.5 % and were associated with the use of Sengstaken-Blakemore tube before cyanoacrylate and very early rebleeding (p < 0.05). Hospital mortality rate during initial bleeding episode was 9.3 %. Very early rebleeding was a strong and independent predictor for in-hospital mortality (p < 0.001). Long-term mortality rate was 58.8 %, in most of the cases secondary to hepatic failure. CONCLUSION: N-butyl-2-cyanoacrylate is a rapid, easy and highly effective modality for immediate hemostasis of gastric variceal bleeding with an acceptable rebleeding rate. Patients with very early rebleeding are at higher risk of death.
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Objectives: Thrombocytopenia and splenomegaly are common features in several haematological disorders. Gaucher disease (GD) is a rare lysosomal storage disorder frequently characterized by thrombocytopenia and splenomegaly, which represents a clinical challenge for haematologists and internists. Case: We describe the case of a 37-year-old patient with a diagnosis of spherocytosis since childhood, who developed hepatic failure and presented striking features of GD including hepatosplenomegaly, bone fractures and post-partum bleeding. We reconsidered the diagnosis of spherocytosis and investigated Gaucher disease. Conclusion: GD should be considered in the differential diagnosis of thrombocytopenia and splenomegaly.