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Janson A, Järvholm K, Gronowitz E, Sjögren L, Klaesson S, Engström M, Peltonen M, Ekbom K, Dahlgren J, Olbers T. A randomized controlled trial comparing intensive non-surgical treatment with bariatric surgery in adolescents aged 13-16 years (AMOS2): Rationale, study design, and patient recruitment. Contemp Clin Trials Commun 2020; 19:100592. [PMID: 32637723 PMCID: PMC7330152 DOI: 10.1016/j.conctc.2020.100592] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 06/08/2020] [Accepted: 06/14/2020] [Indexed: 12/23/2022] Open
Abstract
Background Previous non-randomized studies show similar outcomes in adolescents and adults after bariatric surgery. We describe the study protocol, recruitment, and selected baseline data of patients in a randomized multi-center study, the Adolescent Morbid Obesity Surgery 2 (AMOS2). Methods Three clinics in Sweden collaborated in designing the study and recruitment of patients from August 1, 2014 to June 30, 2017. Patients were selected among adolescents 13–16 years of age attending third-level obesity care for at least one year. Patients were randomized 1:1 to bariatric surgery (predominantly Roux-en-Y gastric bypass) or intensive non-surgical treatment starting with an eight-week low-calorie-diet. Results Fifty adolescents (37 girls) were randomized, 25 (19 girls) to bariatric surgery. Mean age was 15.7 years (range 13.3–16.9), weight 122.6 kg (range 95–183.3), Body Mass Index (BMI) 42.6 kg/m2 (range 35.7–54.9) and BMI-SDS 3.45 (range 2.9–4.1). One patient had type 2 diabetes mellitus, and 12/45 (27%) had elevated liver enzymes. There were no significant differences between the groups. For the 39 eligible patients who were offered but declined inclusion, BMI was not different from included patients. However, patients who declined were younger, 15.2 years (p = 0.021). A sex difference was also noted with more of eligible girls, 37/53 (69.8%), than boys, 13/36 (36.1%), wanting to participate in the study (p = 0.002). Conclusions This clinical trial, randomizing adolescents with severe obesity to bariatric surgery or intensive non-surgical treatment, aims at informing about whether it is beneficial to undergo bariatric surgery in early adolescence. It will also enlighten the outcome of comprehensive non-surgical treatment. The study was registered at www.clinicalTrials.gov number NCT02378259. Bariatric surgery is already a treatment option for adolescents with severe obesity in many countries. We recruited 50 patients 13-16 years of age to a randomized controlled trial. We aimed at investigating the optimal time point for bariatric surgery. Adolescents and their families seemed to make well considered decisions to participate in the study.
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Affiliation(s)
- Annika Janson
- National Childhood Obesity Centre, Karolinska University Hospital, Sweden.,Division of Pediatric Endocrinology, Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden
| | - Kajsa Järvholm
- Childhood Obesity Unit, Skåne University Hospital, Malmö, Sweden.,Region Västra Götaland, Pediatric Obesity Center, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Eva Gronowitz
- Region Västra Götaland, Pediatric Obesity Center, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Lovisa Sjögren
- Region Västra Götaland, Pediatric Obesity Center, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Sven Klaesson
- Department of Women's and Children's Health, Södertälje Hospital, Sweden.,Department of Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden
| | - My Engström
- Institute of Health and Care Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.,Region Västra Götaland, Department of Surgery, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Markku Peltonen
- National Institute for Health and Welfare, Helsinki, Finland
| | - Kerstin Ekbom
- Division of Pediatric Endocrinology, Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden
| | - Jovanna Dahlgren
- Region Västra Götaland, Pediatric Obesity Center, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Torsten Olbers
- Department of Gastrosurgical Research, Sahlgrenska University Hospital, Gothenburg, Sweden.,Department of Biomedical and Clinical Sciences and Wallenberg Center for Molecular Medicine, Linköping University, Linköping, Sweden and Department of Surgery, Vrinnevi Hospital, Norrköping, Sweden
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