This report introduces a Brighton Collaboration (BC) case definition for autoimmune hepatitis (AIH), which has been classified as a priority adverse event of special interest (AESI), as there were possible cases seen following COVID-19 vaccination. The case definition was developed by a group of subject matter and BC process experts to facilitate safety data comparability across pre- and post-licensure clinical trials, as well as pharmacovigilance activities in multiple settings with diverse resources and healthcare access. The usual BC case definition development process was followed in an expedited manner, and took two months to complete, including finalising the manuscript for publication, instead of the usual 1 year development time. It includes a systematic review of the literature and an expert consensus to define levels of diagnostic certainty for AIH, and provides specific guidelines for data collection and analysis. Histology, serological and biochemical tests and exclusion of alternate diagnosis were considered necessary to define the levels of certainty (definitive, probable and possible). AEFI reports of suspected AIH were independently classified by the WG members to test its useability and these classifications were used to finalise the case definition. The document underwent peer review by external AIH experts and a Reference Group of vaccine safety stakeholders in high-, low- and middle-income countries to ensure case definition useability, applicability, and scientific integrity. The expedited process can be replicated for development of other standardised case definitions for priority AESIs for endemics and epidemics. While applicable to cases reported following immunisation, the case definition is independent of lapsed time following vaccination and, as such, can also be used to determine background incidence for vaccinated and unvaccinated control groups in studies of causal association. While use of this case definition is also appropriate for the study of safety of other products including drugs, it is not meant to guide clinical case management.

Mercaptopurine, a thiopurine, is used in various disorders of immune regulation, such as autoimmune hepatitis. Thiopurine metabolism is complex with risk for overdosing, especially when metabolism is impaired by liver dysfunction. Hepatotoxicity may be due to mercaptopurine overdose and is often reversible after prompt cessation of the drug.
Treatment of thiopurine toxicity is mainly supportive and literature on enhanced elimination by renal replacement therapy is ambiguous.
In this case of thiopurine toxicity, a patient with autoimmune hepatitis presents with abdominal pain, nausea, vomiting, and diarrhea. We show in this case report that renal replacement therapy had no effect on total body clearance of mercaptopurine.

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Autoimmune hepatitis (AIH) is characterized by elevated serumaminotransferase and immunoglobulin G levels, seropositive results for autoantibodies and moderate to severe interface hepatitis in histologic findings. It will be most helpful in improving survival and life quality, if patients are diagnosed in the early stage and treated appropriately, which also helps relieve social medical burdens. Chinese consensus on the diagnosis and management of autoimmune hepatitis (2015) has contributed to standardizing the diagnosis and treatment of AIH.On the basis of the first consensus, at the end of 2021, under the organization of Chinese Society of Hepatology, experts devise this guide with latest advances aiming to further improve the level of diagnosis and management of autoimmune hepatitis.
自身免疫性肝炎（autoimmune hepatitis，AIH）患者的临床特点包括血清氨基转移酶水平升高、高免疫球蛋白G血症、血清自身抗体阳性，肝组织学上存在中重度界面性肝炎等。早期诊断和恰当治疗可显著改善AIH患者的生存期和生活质量，减轻社会医疗负担。《自身免疫性肝炎诊断和治疗共识（2015）》在规范我国AIH的诊断和治疗方面发挥了积极作用。在此基础上，2021年底中华医学会肝病学分会组织有关专家结合最新进展制定本部指南，旨在进一步提高我国AIH诊治水平。.

Diagnostic histological criteria for autoimmune hepatitis (AIH) have not been clearly established. Previously published criteria focused mainly on chronic AIH, in which inflammatory changes mainly occur in portal/periportal regions and may not be applicable to acute presentation of AIH, in which inflammatory changes are typically predominantly lobular in location. International consensus criteria for the diagnosis and assessment of disease severity in both acute and chronic AIH are thus urgently needed.
Seventeen expert liver pathologists convened at an international workshop and subsequently used a modified Delphi panel approach to establish consensus criteria for the histopathological diagnosis of AIH.
The consensus view is that liver biopsy should remain standard for diagnosing AIH. AIH is considered likely, if there is a predominantly portal lymphoplasmacytic hepatitis with more than mild interface activity and/or more than mild lobular hepatitis in the absence of histological features suggestive of another liver disease. AIH is also considered likely if there is predominantly lobular hepatitis with or without centrilobular necroinflammation and at least one of the following features: portal lymphoplasmacytic hepatitis, interface hepatitis or portal-based fibrosis, in the absence of histological features suggestive of another liver disease. Emperipolesis and hepatocellular rosettes are not regarded as being specific for AIH.
The criteria proposed in this consensus statement provide a uniform approach to the histological diagnosis of AIH, which is relevant for patients with an acute as well as a chronic presentation and to more accurately reflect the current understanding of liver pathology in AIH.

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Autoimmune liver disease is a group of hepatobiliary inflammatory diseases mediated by abnormal autoimmunity, mainly including autoimmune hepatitis, primary biliary cholangitis, primary sclerosing cholangitis and overlap syndrome of any two of the above diseases at the same time. The standardization of clinical application of autoantibody detection related to autoimmune liver disease is helpful to the diagnosis and classification of diseases, as well as the prediction of prognosis, disease monitoring and pathogenesis research.
自身免疫性肝病是一组由异常自身免疫介导的肝胆炎症性疾病，主要包括自身免疫性肝炎、原发性胆汁性胆管炎、原发性硬化性胆管炎及上述任何两种疾病主要特征同时出现的重叠综合征等。自身免疫性肝病相关自身抗体检测临床应用的标准化，有助于疾病的诊断与分类、预测预后、病情监测及发病机制的研究。.

This document follows up on a 2017 revised international consensus on anti-neutrophil cytoplasm antibodies (ANCA) testing in granulomatosis with polyangiitis and microscopic polyangiitis and focuses on the clinical and diagnostic value of ANCA detection in patients with connective tissue diseases, idiopathic interstitial pneumonia, autoimmune liver diseases, inflammatory bowel diseases, anti-glomerular basement membrane (GBM) disease, infections, malignancy, and during drug treatment. Current evidence suggests that in certain settings beyond systemic vasculitis, ANCA may have clinical, pathogenic and/or diagnostic relevance. Antigen-specific ANCA targeting proteinase-3 and myeloperoxidase should be tested by solid phase immunoassays in any patient with clinical features suggesting ANCA-associated vasculitis and in all patients with anti-GBM disease, idiopathic interstitial pneumonia, and infective endocarditis associated with nephritis, whereas in patients with other aforementioned disorders routine ANCA testing is not recommended. Among patients with autoimmune liver diseases or inflammatory bowel diseases, ANCA testing may be justified in patients with suspected autoimmune hepatitis type 1 who do not have conventional autoantibodies or in case of diagnostic uncertainty to discriminate ulcerative colitis from Crohn\'s disease. In these cases, ANCA should be tested by indirect immunofluorescence as the target antigens are not yet well characterized. Many questions concerning the optimal use of ANCA testing in patients without ANCA-associated vasculitis remain to be answered.

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