title: Adverse events in ambulatory surgery. A comparison between elderly and younger patients.
abstract: OBJECTIVE
  An increasing number of elderly patients are undergoing ambulatory surgery. We examined whether ambulatory surgery carries a higher risk for the elderly than for younger patients.
  
  
  METHODS
  A total of 17,638 consecutive ambulatory surgical patients were enrolled in a prospective cohort study during a three-year period. Preoperative, intraoperative, and postoperative information was collected. Twenty-seven percent of the enrolled patients were 65 yr or older. Incidence rates of intraoperative and postoperative adverse events among the elderly were compared with those among younger patients; we controlled for sex, ASA physical status, body mass index, type of surgery, and duration of procedure, using multiple logistic regression models.
  
  
  RESULTS
  Elderly patients had a higher incidence of any intraoperative event (adjusted odds ratio, 1.4; 99.7% confidence interval [CI], 1.0-2.0) and of intraoperative cardiovascular events (adjusted odds ratio, 2.0; 99.7% CI, 1.3-3.0). They also had a lower incidence of any postoperative event (adjusted odds ratio, 0.4; 99.7% CI, 0.3-0.6) and of postoperative pain (adjusted odds ratio, 0.2; 99.7% CI, 0.1-0.4), nausea and vomiting (adjusted odds ratio, 0.3; 99.7% CI, 0.1-0.6), and dizziness (adjusted odds ratio, 0.4; 99.7% CI, 0.2-1.0).
  
  
  CONCLUSIONS
  The risks reported do not constitute a contraindication for elderly patients to undergo ambulatory surgery but this population may require more careful intraoperative cardiovascular management.
authors.affiliation: Department of Anaesthesia, Toronto Western Hospital, University of Toronto, Ontario, Canada. fchung@torhosp.toronto.on.ca
authors.forename: F
authors.initials: F
authors.lastname: Chung
authors.forename: G
authors.initials: G
authors.lastname: Mezei
authors.forename: D
authors.initials: D
authors.lastname: Tong
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging; D000556:Ambulatory Surgical Procedures / Q000009:adverse effects*; D015992:Body Mass Index; D015331:Cohort Studies; D016001:Confidence Intervals; D004244:Dizziness / Q000453:epidemiology; D005260:Female; D006304:Health Status; D006331:Heart Diseases / Q000453:epidemiology; D006801:Humans; D007431:Intraoperative Complications / Q000453:epidemiology; D007902:Length of Stay / Q000706:statistics & numerical data; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D009864:Ontario / Q000453:epidemiology; D010149:Postoperative Pain / Q000453:epidemiology; D011183:Postoperative Complications / Q000453:epidemiology; D020250:Postoperative Nausea and Vomiting / Q000453:epidemiology; D011446:Prospective Studies; D012307:Risk Factors; D012737:Sex Factors; D013997:Time Factors