title: A retrospective comparison of biliopancreatic diversion with duodenal switch with single anastomosis duodenal switch (SIPS-stomach intestinal pylorus sparing surgery) at a single institution with two year follow-up.
abstract: BACKGROUND
  The traditional duodenal switch is performed using a Roux-en-Y configuration. This procedure has proven to be the most effective procedure for long-term weight loss and co-morbidity reduction. Recently, stomach intestinal pylorus sparing surgery (SIPS) has been introduced as a simpler and potentially safer variation of the duodenal switch (DS). It is a single anastomosis end-to-side proximal duodeno-ileal bypass with a sleeve gastrectomy. In this study, we compare our outcomes between biliopancreatic diversion with duodenal switch (BPD-DS) and SIPS at 2 years.
  
  
  METHODS
  This is a retrospective analysis from a single surgeon at a single private institution.
  
  
  METHODS
  We analyzed data from 182 patients retrospectively, 62 patients underwent BPD-DS while 120 other patients underwent SIPS between September 2011 and March 2015. A subset analysis was performed comparing data from both procedures to evaluate weight loss and complications.
  
  
  RESULTS
  Of 182 patients, 156 patients were beyond 1 year postoperative mark and 99 patients were beyond 2 year postoperative mark. Five patients were lost to follow-up. None of our patients had complications resulting in death. BPD-DS and SIPS had statistically similar weight loss at 3 months but percent excess weight loss (%EWL) was more with BPD-DS than SIPS at 6, 9, 12, 18, and 24 months. Patient lost a mean body mass index (BMI) of 23.3 (follow-up: 69%) and 20.3 kg/m2(follow-up: 71%) at 2 years from the BPD-DS and SIPS surgery, respectively. However, patients who had undergone SIPS procedure had significantly shorter operative time, shorter length of stay, fewer perioperative and postoperative complications than BPD-DS (P<.001). Interestingly, even though BPD-DS patients lost slightly more weight, the actual final BMI for SIPS group was lower than BPD-DS group (25.6 versus 26.9) (P<.05). There was no statistical difference between 2 groups for postoperative nutritional data such as vitamins D, B1, B12, serum calcium, fasting blood glucose, glycosylated hemoglobin (HbA1C), insulin, serum albumin, serum total protein, and lipid panel.
  
  
  CONCLUSIONS
  The SIPS is a simplified DS procedure. The SIPS eliminates one anastomosis and compared with BPD-DS has fewer perioperative and postoperative complications, shorter operative time and length of stay, and similar nutritional results at 2 years. However, weight loss was more with BPD-DS. A fair criticism is that the vast majority of BPD-DS cases were done before the SIPS cases. As a result, experience and learning curve cannot be completely dismissed when viewing postoperative complications.
authors.affiliation: Bariatric Medicine Institute, Salt Lake City, Utah.
authors.forename: Amit
authors.initials: A
authors.lastname: Surve
authors.affiliation: Bariatric Medicine Institute, Salt Lake City, Utah.
authors.forename: Hinali
authors.initials: H
authors.lastname: Zaveri
authors.affiliation: Bariatric Medicine Institute, Salt Lake City, Utah. Electronic address: drdanielcottam@yahoo.com.
authors.forename: Daniel
authors.initials: D
authors.lastname: Cottam
authors.affiliation: Bariatric Medicine Institute, Salt Lake City, Utah.
authors.forename: LeGrand
authors.initials: L
authors.lastname: Belnap
authors.affiliation: Bariatric Medicine Institute, Salt Lake City, Utah.
authors.forename: Austin
authors.initials: A
authors.lastname: Cottam
authors.affiliation: Bariatric Medicine Institute, Salt Lake City, Utah.
authors.forename: Samuel
authors.initials: S
authors.lastname: Cottam
mesh_terms: D015904:Biliopancreatic Diversion / Q000379:methods*; D015992:Body Mass Index; D004386:Duodenum / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D010535:Laparoscopy / Q000379:methods*; D007902:Length of Stay; D008297:Male; D008875:Middle Aged; D009752:Nutritional Status; D009767:Obesity, Morbid / Q000601:surgery; D061646:Operative Time; D059351:Organ Sparing Treatments / Q000379:methods*; D011183:Postoperative Complications / Q000209:etiology; D011708:Pylorus / Q000601:surgery*; D012189:Retrospective Studies; D015431:Weight Loss / Q000502:physiology
keywords: BPD-DS; Bariatric; Duodenal switch; Laparoscopic; Obesity; SIPS