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Long-term outcomes of metabolic and bariatric surgery in adolescents with severe obesity with a follow-up of at least 5 years: A systematic review.

The practice of metabolic and bariatric surgery for adolescents with severe obesity has been increasing, and evidence of the outcomes in the long term remains unclear. The aim of this study was to review and analyze the outcomes of this therapy in adolescents with a follow-up ≥5 years. MEDLINE, EMBASE, and Cochrane databases were systematically searched. Inclusion criteria were 10- to < 20-year-old adolescents, 5 years minimum of follow-up, and a retention rate ≥70% at 5 years of follow-up. Adiposity indicators outcomes, co-morbidity remission, and complications were analyzed. A total of 10 studies met the inclusion criteria. Surgeries performed included gastric bypass, gastric band, and sleeve gastrectomy. The age of the participants ranged from 13 to 17 years. The longest follow-up after intervention was 156 months. Mean body mass index at baseline and follow-up was 47 and 32.4 kg/m 2 , respectively. Most of the studies reported weight regain within 1 to 12 years of follow-up. Remission rate of co-morbidities was 75% for dyslipidemia, 78% for musculoskeletal problems, 85% for hypertension, and 85% for type 2 diabetes. Not all studies stated that they were looking for all complications. Iron deficiency and anemia were high, ranging from 30% to 70% and 16% to 50%, respectively. The review indicates that there is low to moderate evidence that metabolic and bariatric surgery in adolescents with severe obesity after 5 years of follow-up results in substantial reduction in body mass index, and very low to low evidence in the resolution of related co-morbidities. Although long-term complications were inadequately reported or nonreported, a high prevalence of iron deficiency and anemia was found. Because maternal anemia might be implicated in deleterious effects for offspring, monitoring female patients for anemia after metabolic and bariatric surgery is strongly recommended. Further high-quality studies with long-term follow-up are warranted to assess related co-morbidities and long-term complications.

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