title: Hospitalization before and after gastric bypass surgery.
abstract: BACKGROUND
  The use of Roux-en-Y gastric bypass (RYGB) has been reported to be effective in the treatment of obesity and its related comorbidities. Utilization of inpatient services after RYGB is less well understood.
  
  
  OBJECTIVE
  To determine the rates and indications for inpatient hospital use before and after RYGB.
  
  
  METHODS
  Retrospective study of Californians receiving RYGB in California hospitals from 1995 to 2004.
  
  
  METHODS
  Hospitalization in the 1 to 3 years after RYGB.
  
  
  RESULTS
  In California from 1995 to 2004, 60,077 patients underwent RYGB-11,659 in 2004 alone. The rate of hospitalization in the year following RYGB was more than double the rate in the year preceding RYGB (19.3% vs 7.9%, P<.001). Furthermore, in the subset of patients (n = 24,678) with full 3-year follow-up, a mean of 8.4% were admitted a year before RYGB while 20.2% were readmitted in the year after RYGB, 18.4% in the second year after RYGB, and 14.9% in the third year after RYGB. The most common reasons for admission prior to RYGB were obesity-related problems (eg, osteoarthritis, lower extremity cellulitis), and elective operation (eg, hysterectomy), while the most common reasons for admission after RYGB were complications often thought to be procedure related, such as ventral hernia repair and gastric revision. In multivariate logistic regression models predicting 1-year readmission after RYGB, increasing Charlson Comorbidity Index score, and hospitalization in the 3-year period prior to RYGB were significantly associated with readmission within a year.
  
  
  CONCLUSIONS
  Increases in hospital use after surgery appear to be related to RYGB. Payers, clinicians, and patients must consider the not-inconsequential rate of rehospitalization after this type of surgery.
authors.affiliation: Division of General Internal Medicine and Health Services Research, Department of Medicine, The David Geffen School of Medicine at the University of California Los Angeles, Los Angeles 90095-1736, USA. dzingmond@mednet.ucla.edu
authors.forename: David S
authors.initials: DS
authors.lastname: Zingmond
authors.forename: Marcia L
authors.initials: ML
authors.lastname: McGory
authors.forename: Clifford Y
authors.initials: CY
authors.lastname: Ko
mesh_terms: D000328:Adult; D000368:Aged; D049088:Bariatrics / Q000706:statistics & numerical data*; D002140:California / Q000453:epidemiology; D015897:Comorbidity; D005260:Female; D015390:Gastric Bypass / Q000009:adverse effects* / Q000706:statistics & numerical data; D006302:Health Services Research; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D009767:Obesity, Morbid / Q000150:complications / Q000453:epidemiology / Q000601:surgery*; D010359:Patient Readmission; D012189:Retrospective Studies