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Association between non-alcoholic fatty liver disease and decreased lung function in adults: a systematic review and meta-analysis - 05/05/19

Doi : 10.1016/j.diabet.2019.04.008 
Alessandro Mantovani, MD 1, Amedeo Lonardo, MD 2, Giulia Vinco, MD 1, Giacomo Zoppini, MD 1, Giuseppe Lippi, MD 3, Enzo Bonora, MD 1, Rohit Loomba, MD 4, Herbert Tilg, MD 5, Christopher D. Byrne, MB BCh, PhD 6, 7, Leonardo Fabbri, MD 8, 9, Giovanni Targher, MD 1,
1 Section of Endocrinology, Diabetes and Metabolism, Department of Medicine, University and Azienda Ospedaliera Universitaria Integrata of Verona, Verona, Italy 
2 Department of Internal Medicine, Azienda Ospedaliero-Universitaria di Modena, Ospedale Civile di Baggiovara, Modena, Italy 
3 Section of Clinical Biochemistry, University and Azienda Ospedaliera Universitaria Integrata of Verona, Verona, Italy 
4 NAFLD Research Center, Division of Gastroenterology, University of California, San Diego, CA, United States 
5 Department of Internal Medicine I, Gastroenterology, Hepatology & Metabolism, Medical University Innsbruck, Innsbruck, Austria 
6 Nutrition and Metabolism, Faculty of Medicine, University of Southampton, UK 
7 Southampton National Institute for Health Research Biomedical Research Centre, University Hospital Southampton, Southampton General Hospital, Southampton SO16 6YD, UK 
8 Research Centre on Asthma and COPD, University of Ferrara, Ferrara, Italy 
9 COPD Center, Sahlgrenska University Hospital, Gothenburg, Sweden 

Corresponding author: Section of Endocrinology, Diabetes and Metabolism Department of Medicine University and Azienda Ospedaliera Universitaria Integrata Piazzale Stefani, 1 37126 Verona, ItalySection of Endocrinology, Diabetes and Metabolism Department of Medicine University and Azienda OspedalieraUniversitaria Integrata Piazzale StefaniVerona1 37126Italy
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Abstract

Aim. - Recent observational studies assessed the association between non-alcoholic fatty liver disease (NAFLD) and lung function in adults, but the magnitude of this association remains uncertain. We estimated the magnitude of the association between NAFLD and lung function on spirometry (predicted forced expiratory volume in 1 sec [FEV1] and forced vital capacity [FVC]).

Methods. - We searched publication databases using predefined keywords to identify studies (published up to October 4, 2018), in which NAFLD was diagnosed by imaging or biochemistry (no studies with biopsy-proven NAFLD were available). Data from selected studies were extracted, and meta-analysis was performed using random-effects modelling.

Results. - Six observational studies (5 cross-sectional and 1 longitudinal) with aggregate data on 133,707 individuals (27.8% with NAFLD) of predominantly Asian ethnicity (74.6%) were included in the final analysis. There were significant differences in predicted FEV1 (n = 5 studies; pooled weighted mean difference [WMD]: -2.43%, 95%CI -3.28 to -1.58; I2 = 69.7%) and predicted FVC (pooled WMD: -2.96%, 95%CI -4.75 to -1.17; I2 = 91.7%) between individuals with and without NAFLD. Decreased FEV1 and FVC at baseline were also independently associated with a ~15% increased risk of incident NAFLD (n = 1 study in Korean individuals). Subgroup analyses did not materially modify these findings.

Conclusions. - NAFLD is associated with significant reductions of both FEV1 and FVC in Asian and United States adults, and such small, but significant, reductions of lung volumes at baseline may be also associated with increased NAFLD incidence in Asian individuals. Further research is needed to better elucidate the link between NAFLD and impaired lung volumes.

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Keywords : Lung function, Meta-analysis, NAFLD, Pulmonary fibrosis, Spirometry



© 2019  Publié par Elsevier Masson SAS.
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