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Etiology of NAFLD
#NAFLD #harrison #liver #medicine
Because the vast majority of these subjects deny hazardous levels of alcohol consumption (defined as greater than one drink per day in women or two drinks per day in men), they are considered to have NAFLD. NAFLD is strongly associ- ated with overweight/obesity and insulin resistance. However, it can also occur in lean individuals and is particularly common in those with a paucity of adipose depots (i.e., lipodystrophy). Ethnic/racial factors also appear to influence liver fat accumulation; the documented prev- alence of NAFLD is lowest in African Americans (~25%), highest in Americans of Hispanic ancestry (~50%), and intermediate in American whites (~33%). NAFLD encompasses a spectrum of liver pathology with different clinical prognoses. The simple accumulation of triglyceride within hepatocytes (hepatic steatosis) is on the most clinically benign extreme of the spectrum. On the opposite, most clinically ominous extreme, are cirrhosis (Chap. 337) and primary liver cancer (Chap. 78). The risk of developing cirrhosis is extremely low in individuals with chronic hepatic steatosis, but increases as steatosis becomes complicated by histologically conspicuous hepatocyte death and inflammation (i.e., nonalcoholic steatohepatitis [NASH]). NASH itself is also a heteroge- neous condition; sometimes it improves to steatosis or normal histol- ogy, sometimes it remains relatively stable for years, but sometimes it results in progressive accumulation of fibrous scar that eventuates in cirrhosis. Once NAFLD-related cirrhosis develops, the annual inci- dence of primary liver cancer can be as high as 3%
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  • owner: nerdparty67 - (no access) - HARRISON Principles of Internal Medicine 20th Edition.pdf, p2401
  • owner: Anonymouse - (no access) - @MBS_MedicalBooksStore_2018_Harrison's.pdf, p2447


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