title: Older Adults and Unanticipated Hospital Admission within 30 Days of Ambulatory Surgery: An Analysis of 53,667 Ambulatory Surgical Procedures.
abstract: OBJECTIVE
  To evaluate whether age is independently associated with greater rate of unanticipated hospital admission within 30 days of ambulatory surgery.
  
  
  METHODS
  Retrospective database study.
  
  
  METHODS
  The 2012 National Surgical Quality Improvement Project data set.
  
  
  METHODS
  All individuals with "outpatient" recorded as their status in the data set.
  
  
  METHODS
  The primary outcome of interest was all-cause hospital admission in the 30-day period after surgery. Multivariate models were constructed to control for covariate bias. Assessment of interactions of terms in the final model was performed using a conditional tree analysis.
  
  
  RESULTS
  The final analysis included 53,667 ambulatory surgical cases. There were 1,370 (2.5%, 99% confidence interval (CI) = 2.4-2.7%) hospital admissions among the cases evaluated. After adjusting for potential confounders, age (<70 vs ≥70) was independently associated with hospital admission (odds ratio = 1.54, 99% CI = 1.29-1.84). A classification tree analysis of the cases without postoperative morbidity identified age (<60 vs ≥60) as an important decision point leading to greater likelihood of admission (P < .001) within 30 days after ambulatory surgery.
  
  
  CONCLUSIONS
  Even after adjusting for comorbidities, older adults are at greater risk of unanticipated hospital admission within 30 days of ambulatory surgery. Renal failure, chronic obstructive pulmonary disease, current cancer treatment, diabetes mellitus, and history of amputation or revascularization were also associated with greater likelihood of hospital admission. Interventions to improve transitions of care for older adults after ambulatory surgery are needed.
authors.affiliation: Department of Anesthesiology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois.
authors.forename: Gildasio S
authors.initials: GS
authors.lastname: De Oliveira
authors.affiliation: Center for Healthcare Studies, Feinberg School of Medicine, Northwestern University, Chicago, Illinois.
authors.forename: Jane L
authors.initials: JL
authors.lastname: Holl
authors.affiliation: Division of Geriatrics, Department of Internal Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois.
authors.forename: Lee Ann
authors.initials: LA
authors.lastname: Lindquist
authors.affiliation: Division of Geriatrics, Department of Internal Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois.
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Hackett
authors.affiliation: Department of Surgery, Feinberg School of Medicine, Northwestern University, Chicago, Illinois.
authors.forename: John Y S
authors.initials: JY
authors.lastname: Kim
authors.affiliation: Department of Anesthesiology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois.
authors.forename: Robert J
authors.initials: RJ
authors.lastname: McCarthy
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000556:Ambulatory Surgical Procedures / Q000706:statistics & numerical data*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007087:Illinois / Q000453:epidemiology; D015994:Incidence; D008297:Male; D008875:Middle Aged; D010343:Patient Admission / Q000706:statistics & numerical data*; D011183:Postoperative Complications / Q000453:epidemiology*; D011184:Postoperative Period; D012189:Retrospective Studies; D012307:Risk Factors; D013997:Time Factors
keywords: admission; ambulatory; older adult; surgery