title: Trends in utilization of bariatric surgery, 2009-2012.
abstract: Utilization of bariatric surgery has changed dramatically over the past two decades. The aim of this study was to update the trends in volume and procedural type of bariatric surgery in the USA. Data were derived from the National Inpatient Sample from 2009 through 2012.
  
  
  
  We used ICD-9 diagnosis and procedural codes to identify all hospitalizations during which a bariatric procedure was performed for the treatment of severe obesity. The data were reviewed for patient demographics and characteristics, annual number of bariatric operations, and specific procedural types and proportion of laparoscopic cases. The US Census data were used to calculate the population-based annual rate of bariatric surgery per 100,000 adults.
  
  
  
  Between 2009 and 2012, the number of inpatient bariatric operations ranged between 81,005 and 114,780 cases annually. During this time period, the annual rate of bariatric procedures was highest for 2012 at 47.3 procedures per 100,000 adults. The bariatric surgery approach most commonly performed continues to be laparoscopic, ranging between 93.1 and 97.1 %. In 2012, there was a precipitous reduction in the number of gastric bypass and gastric banding operations and replaced by an increase in the number of sleeve gastrectomy operation. The in-hospital mortality rate remains low, ranging from 0.07 to 0.10 %.
  
  
  
  In the USA, the annual volume of inpatient bariatric surgery continues to be stable. Utilization of the laparoscopic approach to bariatric surgery remains high, while the in-hospital mortality continues to be low at ≤0.10 % throughout the 4-year period.
authors.affiliation: Department of Surgery, University of California Irvine Medical Center, 333 City Bldg. West, Suite 1600, Orange, CA, 92868, USA. sdvu@uci.edu.
authors.forename: Ninh T
authors.initials: NT
authors.lastname: Nguyen
authors.affiliation: Department of Surgery, University of California Irvine Medical Center, 333 City Bldg. West, Suite 1600, Orange, CA, 92868, USA.
authors.forename: Stephen
authors.initials: S
authors.lastname: Vu
authors.affiliation: Department of Surgery, University of California Irvine Medical Center, 333 City Bldg. West, Suite 1600, Orange, CA, 92868, USA.
authors.forename: Eric
authors.initials: E
authors.lastname: Kim
authors.affiliation: Department of Surgery, Moscow Clinical Scientific Center, Moscow, Russia.
authors.forename: Natalia
authors.initials: N
authors.lastname: Bodunova
authors.affiliation: Department of Statistics, University of California Irvine, Irvine, CA, USA.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Phelan
mesh_terms: D000328:Adult; D050110:Bariatric Surgery / Q000706:statistics & numerical data / Q000639:trends*; D015897:Comorbidity; D016208:Databases, Factual; D003920:Diabetes Mellitus / Q000453:epidemiology; D050171:Dyslipidemias / Q000453:epidemiology; D005260:Female; D005743:Gastrectomy / Q000706:statistics & numerical data / Q000639:trends; D015390:Gastric Bypass / Q000706:statistics & numerical data / Q000639:trends; D017052:Hospital Mortality; D006760:Hospitalization; D006801:Humans; D006973:Hypertension / Q000453:epidemiology; D038801:International Classification of Diseases; D010535:Laparoscopy / Q000706:statistics & numerical data / Q000639:trends*; D008297:Male; D008875:Middle Aged; D009767:Obesity, Morbid / Q000453:epidemiology / Q000601:surgery*; D012891:Sleep Apnea Syndromes / Q000453:epidemiology; D014481:United States
keywords: Bariatric surgery; Laparoscopy; Outcomes; Trends