title: The effect of anesthetic technique on postoperative outcomes in hip fracture repair.
abstract: BACKGROUND
  The impact of anesthetic choice on postoperative mortality and morbidity has not been determined with certainty.
  
  
  METHODS
  The authors evaluated the effect of type of anesthesia on postoperative mortality and morbidity in a retrospective cohort study of consecutive hip fracture patients, aged 60 yr or older, who underwent surgical repair at 20 US hospitals between 1983 and 1993. The primary outcome was defined as death within 30 days of the operative procedure. The secondary outcomes were postoperative 7-day mortality, postoperative myocardial infarction, postoperative pneumonia, postoperative congestive heart failure, and postoperative change in mental status. Numerous comorbid conditions were controlled for individually and by several comorbidity indices using logistic regression.
  
  
  RESULTS
  General anesthesia was used in 6,206 patients (65.8%) and regional anesthesia in 3,219 patients (3,078 spinal anesthesia and 141 epidural anesthesia). The 30-day mortality rate in the general anesthesia group was 4.4%, compared with 5.4% in the regional anesthesia group (unadjusted odds ratio = 0.80; 95% confidence interval = 0.66-0.97). However, the adjusted odds ratio for general anesthesia increased to 1.08 (0.84-1.38). The adjusted odds ratios for general anesthesia versus regional anesthesia for the 7-day mortality was 0.90 (0.59-1.39) and for postoperative morbidity outcomes were as follows: myocardial infarction: adjusted odds ratio = 1.17 (0.80-1.70); congestive heart failure: adjusted odds ratio = 1.04 (0.80-1.36); pneumonia: adjusted odds ratio = 1.21 (0.87-1.68); postoperative change in mental status: adjusted odds ratio = 1.08 (0.95-1.22).
  
  
  CONCLUSIONS
  The authors were unable to demonstrate that regional anesthesia was associated with better outcome than was general anesthesia in this large observational study of elderly patients with hip fracture. These results suggest that the type of anesthesia used should depend on factors other than any associated risks of mortality or morbidity.
authors.affiliation: Department of Anesthesiology, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, New Brunswick 08903-0019, USA.
authors.forename: D A
authors.initials: DA
authors.lastname: O'Hara
authors.forename: A
authors.initials: A
authors.lastname: Duff
authors.forename: J A
authors.initials: JA
authors.lastname: Berlin
authors.forename: R M
authors.initials: RM
authors.lastname: Poses
authors.forename: V A
authors.initials: VA
authors.lastname: Lawrence
authors.forename: E C
authors.initials: EC
authors.lastname: Huber
authors.forename: H
authors.initials: H
authors.lastname: Noveck
authors.forename: B L
authors.initials: BL
authors.lastname: Strom
authors.forename: J L
authors.initials: JL
authors.lastname: Carson
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000765:Anesthesia, Conduction; D000768:Anesthesia, General; D015331:Cohort Studies; D005260:Female; D006620:Hip Fractures / Q000401:mortality / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000453:epidemiology / Q000401:mortality; D012189:Retrospective Studies; D016896:Treatment Outcome