title: A contemporary analysis of outcomes for operative repair of type A aortic dissection in the United States.
abstract: BACKGROUND
  Despite recent advances, reported mortality rates after repair for acute type A aortic dissection vary from 5% to 30%. This study was conducted to assess cross-sectional mortality after operative repair of type A dissection in the United States, and to determine whether a volume-outcome relationship exists for this operative procedure.
  
  
  METHODS
  Data were obtained from the Nationwide Inpatient Sample, which is a cross-sectional administrative database incorporating 20% of all annual US hospital discharges. From 1995 to 2003, a cohort of 3013 patients with thoracic or thoracoabdominal dissection who underwent aortic resection was identified. Patient demographics, hospital volumes, and teaching status were included as independent variables.
  
  
  RESULTS
  The mean age was 62 +/- 14 years (65% male). In-hospital mortality for the study period was 26%, but it decreased from 27% in 1995 to 23% in 2003 (P = .03). A significant correlation was found between procedural volume and mortality (P < .001). By multivariate analysis, independent predictors of mortality included increasing age (P < .0001) and operation at a non-teaching hospital (P = .002).
  
  
  CONCLUSIONS
  Operative mortality for repair of ascending aortic dissection in the United States has shown modest temporal improvements. More importantly, operative mortality seems to be dependent on the arena of care.
authors.affiliation: Department of Surgery, University of Michigan Medical Center, Ann Arbor, Michigan, USA.
authors.forename: Brian S
authors.initials: BS
authors.lastname: Knipp
authors.forename: G Michael
authors.initials: GM
authors.lastname: Deeb
authors.forename: Richard L
authors.initials: RL
authors.lastname: Prager
authors.forename: Candace Y
authors.initials: CY
authors.lastname: Williams
authors.forename: Gilbert R
authors.initials: GR
authors.lastname: Upchurch
authors.forename: Himanshu J
authors.initials: HJ
authors.lastname: Patel
mesh_terms: D017677:Age Distribution; D000368:Aged; D000784:Aortic Dissection / Q000401:mortality* / Q000601:surgery*; D001014:Aortic Aneurysm / Q000401:mortality* / Q000601:surgery*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D013503:Surgery Department, Hospital / Q000706:statistics & numerical data; D016896:Treatment Outcome; D014481:United States / Q000453:epidemiology; D014656:Vascular Surgical Procedures / Q000401:mortality*