title: Can the Obesity Surgery Mortality Risk Score predict postoperative complications other than mortality?
abstract: BACKGROUND
  Laparoscopic sleeve gastrectomy (LSG) and laparoscopic Roux-en-Y gastric bypass (LRYGB) are bariatric procedures with acceptable risk of postoperative morbidities and mortalities, but identification of high-risk patients is an ongoing issue. DeMaria et al. introduced the Obesity Surgery Mortality Risk Score (OS-MRS), which was designed for mortality risk assessment but not perioperative morbidity risk.
  
  
  OBJECTIVE
  To assess the possibility to use the OS-MRS to predict the risk of perioperative complications related to LSG and LRYGB.
  
  
  METHODS
  Retrospective analysis of patients operated on for morbid obesity was performed. Patients were evaluated before and after surgery. We included 408 patients (233 LSG, 175 LRYGB). Perioperative complications were defined as adverse effects in the 30-day period. The Clavien-Dindo scale was used for description of complications. Patients were assigned to five grades and three classes according to the OS-MRS results, then risk of morbidity was analyzed.
  
  
  RESULTS
  Complications were observed in 30 (7.35%) patients. Similar morbidity was related to both procedures (OR = 1.14, 95% CI: 0.53-2.44, p = 0.744). The reoperation and mortality rates were 1.23% and 0.49% respectively. There were no significant differences in median OS-MRS value between the group without and the group with perioperative complications. There were no significant differences in OS-MRS between groups (p = 0.091). Obesity Surgery Mortality Risk Score was not related to Clavien-Dindo grades (p = 0.800).
  
  
  CONCLUSIONS
  It appears that OS-MRS is not useful in predicting risk of perioperative morbidity after bariatric procedures.
authors.affiliation: 2 Department of Surgery, Jagiellonian University, Medical College, Krakow, Poland.
authors.forename: Piotr
authors.initials: P
authors.lastname: Major
authors.affiliation: Students' Scientific Group at 2 Department of Surgery, Jagiellonian University, Medical College, Krakow, Poland.
authors.forename: Michał
authors.initials: M
authors.lastname: Wysocki
authors.affiliation: 2 Department of Surgery, Jagiellonian University, Medical College, Krakow, Poland.
authors.forename: Michał
authors.initials: M
authors.lastname: Pędziwiatr
authors.affiliation: 2 Department of Surgery, Jagiellonian University, Medical College, Krakow, Poland.
authors.forename: Piotr
authors.initials: P
authors.lastname: Małczak
authors.affiliation: 2 Department of Surgery, Jagiellonian University, Medical College, Krakow, Poland.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Pisarska
authors.affiliation: 2 Department of Surgery, Jagiellonian University, Medical College, Krakow, Poland.
authors.forename: Marcin
authors.initials: M
authors.lastname: Migaczewski
authors.affiliation: 2 Department of Surgery, Jagiellonian University, Medical College, Krakow, Poland.
authors.forename: Marek
authors.initials: M
authors.lastname: Winiarski
authors.affiliation: 2 Department of Surgery, Jagiellonian University, Medical College, Krakow, Poland.
authors.forename: Andrzej
authors.initials: A
authors.lastname: Budzyński
keywords: Obesity Surgery Mortality Risk Score; bariatric surgery; complications