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Autoimmune liver diseases are rare serious diseases causing chronic inflammation and fibrosis in the liver parenchyma and bile ducts. Yet, the prevalence and burden of autoimmune liver diseases are largely unexplored in Arctic native populations. We investigated the prevalence and management of autoimmune liver diseases in Greenland using nationwide cross-sectional register data and subsequent medical chart reviews validating diagnoses and extracting liver histology examinations and medical treatments. The overall prevalence of autoimmune liver diseases in Greenland was 24.6 per 100,000 (95% CI: 14.7–41.3). This was based on 7 patients with autoimmune hepatitis (AIH) (12.3 per 100,000), 3 patients with primary biliary cholangitis (PBC) (5.3 per 100,000), 4 patients with AIH/PBC overlap disease (7.0 per 100,000), and no patients with primary sclerosing cholangitis. All diagnoses were confirmed by liver histology examinations. Medical treatments adhered to internal recommendations and induced complete remission in most patients with AIH, and complete or partial remission in 1 patient with PBC and 3 patients with AIH/PBC overlap disease. One patient had established cirrhosis at the time of diagnosis, while 2 patients progressed to cirrhosis. In conclusion, the prevalence of autoimmune liver diseases was lower in Greenland than in Scandinavia and among Alaska Inuit. [ABSTRACT FROM AUTHOR]

Background. Hepatitis B virus (HBV) infection is common in Arctic populations and high alcohol intake has been associated with an increased risk of a number of diseases. Yet, a description of the influence of alcohol intake in persons with HBV infection on liver biochemistry is lacking. Objective. We aimed to describe the association between reported alcohol intake and liver biochemistry taking into account also HBV infection, ethnicity, Inuit diet, body mass index (BMI), gender and age in an Arctic population. Design and methods. Population-based investigation of Inuit (n =441) and non-Inuit (94) in Greenland and Inuit living in Denmark (n =136). Participants filled in a questionnaire on alcohol intake and other life style factors. Blood samples were tested for aspartate aminotransferase (AST), gamma-glutamyl transferase (GGT), alkaline phosphatase (ALP), bilirubin, albumin, hepatitis B surface antigen, hepatitis B surface antibody and hepatitis B core antibody. We also performed physical examinations. Results. Participation rate was 95% in Greenland and 52% in Denmark. An alcohol intake above the recommended level was reported by 12.9% of non-Inuit in Greenland, 9.1% of Inuit in East Greenland, 6.1% of Inuit migrants and 3.4% of Inuit in the capital of Greenland (p =0.035). Alcohol intake was associated with AST (p B0.001) and GGT (p =0.001), and HBV infection was associated with ALP (p =0.001) but not with AST, GGT, bilirubin or albumin in the adjusted analysis. Inuit had higher AST (p B0.001), GGT (p B0.001) and ALP (p =0.001) values than non-Inuit after adjustment for alcohol, diet, BMI and HBV exposure. Ethnic origin modified the association between alcohol and AST, while HBV infection did not modify the associations between alcohol and liver biochemistry. Conclusions. Non-Inuit in Greenland reported a higher alcohol intake than Inuit. Ethnic origin was more markedly associated with liver biochemistry than was alcohol intake, and Greenlandic ethnicity modified the effect of alcohol intake on AST. HBV infection was slightly associated with ALP but not with other liver biochemistry parameters. [ABSTRACT FROM AUTHOR]

Background. Obesity is associated with increased morbidity and premature death. Obesity rates have increased worldwide and the WHO recommends monitoring. A steep rise in body mass index (BMI), a measure of adiposity, was detected in Greenland from 1963 to 1998. Interestingly, the BMI starting point was in the overweight range. This is not conceivable in a disease-free, physically active, pre-western hunter population. Objective. This led us to reconsider the cut-off point for overweight among Inuit in Greenland. Design and findings. We found 3 different approaches to defining the cut-off point of high BMI in Inuit. First, the contribution to the height by the torso compared to the legs is relatively high. This causes relatively more kilograms per centimetre of height that increases the BMI by approximately 10% compared to Caucasian whites. Second, defining the cut-off by the upper 90-percentile of BMI from height and weight in healthy young Inuit surveyed in 1963 estimated the cut-off point to be around 10% higher compared to Caucasians. Third, if similar LDL-cholesterol and triglycerides are assumed for a certain BMI in Caucasians, the corresponding BMI in Inuit in both Greenland and Canada is around 10% higher. However, genetic admixture of Greenland Inuit and Caucasian Danes will influence this difference and hamper a clear distinction with time. Conclusion. Defining overweight according to the WHO cut-off of a BMI above 25 kg/m2 in Greenland Inuit may overestimate the number of individuals with elevated BMI. [ABSTRACT FROM AUTHOR]

Introduction: The increasing prevalence of obesity and type 2 diabetes mellitus has become a global healthcare concern spreading to indigenous Arctic populations. As non-alcoholic fatty liver disease (NAFLD) is strongly associated with the metabolic syndrome, it has become a leading cause of chronic liver disease. However, data are sparse on the prevalence of NAFLD in indigenous Arctic populations who may have a different risk profile for diabetes complications., Methods: We conducted a systematic review to estimate the prevalence of NAFLD or signs of NAFLD in indigenous Arctic people inhabiting Greenland, Alaska, Canadian territories and Eastern Russia. Also, we wanted to discuss how Arctic research in metabolic disease such as NAFLD may move forward., Results: Through the pre-specified search of Ovid MEDLINE and Embase, 3,070 unique references were identified and six studies including 5,487 persons qualified for data extraction. The prevalence of NAFLD or signs of NAFLD varied between 21% and 65%. The risk of bias was considerable particularly due to the inclusion of small and heterogeneous studies., Conclusion: Only limited published research exists on NAFLD in indigenous Arctic populations. This review reports that the prevalence of NAFLD or signs of NAFLD in the indigenous Arctic populations residing in Arctic Regions may be similar to the global level, emphasising the need for further health research in indigenous Arctic populations., (Articles published in the DMJ are “open access”. This means that the articles are distributed under the terms of the Creative Commons Attribution Non-commercial License, which permits any non-commercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.)