Single Anastomosis Duodenal-Ileal Bypass with Sleeve Gastrectomy/One Anastomosis Duodenal Switch (SADI-S/OADS) IFSO Position Statement


The International Federation for the Surgery of Obesity and Metabolic Disorders (IFSO) has played an integral role in educating both the metabolic surgical and the medical community at large about the role of innovative and new surgical and or endoscopic interventions in treating adiposity-based chronic diseases. The single anastomosis duodenal-ileal bypass with sleeve gastrectomy (SADI-S) is also called the one anastomosis duodenal switch (OADS). This is a relatively new procedure that has been proposed as an alternative to the currently accepted duodenal switch (DS) procedure. The IFSO commissioned a task force (Appendix 1) to determine if SADI-S/OADS is an effective and safe procedure and if it should be considered a surgical option for the treatment of adiposity and adiposity-based chronic diseases. The following position statement is issued by the IFSO SADI-S/OADS task force and approved by the IFSO Executive Board. This statement is based on current clinical knowledge, expert opinion and published peer-reviewed scientific evidence. It will be reviewed in 2 years.

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Corresponding author

Correspondence to Wendy A. Brown.

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Conflict of Interest

Dr. Brown reports grants from Johnson and Johnson, grants from Medtronic, grants from GORE, personal fees from GORE, grants from Applied Medical, grants from Apollo Endosurgery, grants and personal fees from Novo Nordisc, personal fees from Merck Sharpe and Dohme, outside the submitted work. Dr. Himpens reports personal fees from Ethicon, personal fees from Medtronic, outside the submitted work. Dr. Ooi reports personal fees from the National Health and Medical Research Council, personal fees from Royal Australasian College of Surgeon, outside the submitted work. Dr. Higa has nothing to disclose. Dr. Torres has nothing to disclose.

Ethics Statement

Ethical approval is not required for this type of study.

Patient Consent

Patient consent is not required for this type of study.


Appendix 1 Members of the IFSO-appointed task force reviewing the literature on SADI-DS/OADS

Kelvin Higa—USA

Geraldine Ooi—Australia

Wendy Brown—Australia

Antonio Torres—Spain

Jacques Himpens—Belgium

Miguel Herrera—Mexico

Wei Jei Lee—Taiwan

Michel Suter—Switzerland

Scott Shikora—USA

Appendix 2

Table 2 List of search terms used

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Brown, W.A., Ooi, G., Higa, K. et al. Single Anastomosis Duodenal-Ileal Bypass with Sleeve Gastrectomy/One Anastomosis Duodenal Switch (SADI-S/OADS) IFSO Position Statement. OBES SURG 28, 1207–1216 (2018).

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  • Position statement
  • IFSO
  • OADS
  • SADI