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Changes in metabolic hormones after bariatric surgery and their predictive impact on weight loss
Author(s) -
Kruljac Ivan,
Mirošević Gorana,
Kirigin Lora S.,
Nikolić Marko,
Ljubičić Neven,
Budimir Ivan,
Bekavac Bešlin Miroslav,
Vrkljan Milan
Publication year - 2016
Publication title -
clinical endocrinology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.055
H-Index - 147
eISSN - 1365-2265
pISSN - 0300-0664
DOI - 10.1111/cen.13160
Subject(s) - weight loss , hormone , medicine , endocrinology , obesity
Summary Background Although various metabolic hormones have been implicated in bariatric‐related weight loss, their use as predictors of weight loss is unknown. Our study evaluates changes in metabolic hormones after bariatric surgery, and their role as predictors of weight loss. Methods This nonrandomized study included 51 patients, 21 underwent laporascopic adjustable gastric banding ( LAGB ), 15 laparoscopic sleeve gastrectomy ( LSG ) and 15 Roux‐en Y gastric bypass ( RYGB ). Serum ghrelin, leptin, insulin, growth hormone, HOMA ‐ IR and HOMA ‐β was recorded at baseline and 1, 3, 6 and 12 months, and correlated with weight loss. Successful weight loss was defined as excess weight loss >50% at 12 months for all groups. Results Weight loss pattern was similar in all groups. Ghrelin increased only in the LAGB group ( P = 0·016). However, baseline ghrelin concentrations >664·6 pg/mL in the LSG group predicted successful weight loss with 81·8% sensitivity and 100·0% specificity, and ghrelin >969·8 pg/mL in the 1st postoperative month predicted success with 83·3% sensitivity and 83·3% specificity in the LAGB group. Insulin and HOMA ‐ IR decreased significantly in the LSG and RYGB group, HOMA ‐β increased in the LAGB and LSG group. Serum leptin decreased and GH increased in all groups ( P < 0·001 for all changes). Changes in insulin, leptin and growth hormone were not predictors, but a consequence of weight loss. Conclusions LSG is the most effective procedure for improvement of beta‐cell function. High baseline ghrelin in the LSG group and an adequate 1st month increase in the LAGB group are associated with greater weight loss. Validation studies are required to confirm the role of ghrelin in predicting weight loss after bariatric surgery, but also in selecting candidates for specific bariatric procedures.