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 22 June 2018

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News

High prevalence of NAFLD in adolescents undergoing bariatric surgery

This month's Gastroenterology reports a high prevalence of nonalcoholic fatty liver disease in adolescents undergoing bariatric surgery.

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Little is known about the prevalence of nonalcoholic fatty liver disease (NAFLD) among severely obese adolescents or factors that determine its development.

Dr Stavra Xanthakos and colleagues from Ohio, USA investigated the prevalence of NAFLD in a multicenter cohort of adolescents undergoing bariatric surgery and the factors associated with it.

The research team enrolled 242 adolescents undergoing bariatric surgery between 2007 and 2012 at 5 tertiary care centers into a multicenter, prospective observational cohort study.

Intraoperative core liver biopsies were collected from 165 subjects.

Dyslipidemia was present in 78% of subjects
Gastroenterology

The team excluded 17 biopsies because of insufficient liver tissue or use of hepatotoxic medications, so 148 remained in the study.

Liver tissues were analyzed by histology using validated criteria. Hepatic gene expression was analyzed in 67 samples.

The researchers found that NAFLD was present in 59% of this predominantly female, white, non-Hispanic cohort.

Of subjects with NAFLD, 24% had borderline and 10% had definite nonalcoholic steatohepatitis (NASH).

The researchers found that mild fibrosis was observed in 18% of liver biopsies and stage 3 was observed in 0.7%, but cirrhosis was not detected.

The team noted that dyslipidemia was present in 78% of subjects, hypertension in 44%, and diabetes in 14%.

The researchers found that more severe NAFLD was associated with increasing levels of alanine aminotransferase, fasting glucose level, hypertension, and white blood cell count.

The team noted that only diabetes was associated with detection of fibrosis.

Microarray analysis associated presence of NASH with altered expression of genes that regulate macrophage chemotaxis, cholesterol absorption, and fatty acid binding.

Dr Xanthakos' team concluded, "More than half of adolescents undergoing bariatric surgery in this cohort had NAFLD, yet the prevalence of severe or fibrotic NASH was low."

"Increasing severity of NAFLD was associated with level of alanine aminotransferase and cardiometabolic risk factors, but not body mass index."

"Based on gene expression analysis, borderline and definite NASH were associated with abnormal immune function, intestinal cholesterol absorption, and lipid metabolism."

Gastroenterol 2015: 149(3): 623–634.e8
03 September 2015

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