title: Does the presence of ultrasound really affect computed tomographic scan use? A prospective randomized trial of ultrasound in trauma.
abstract: OBJECTIVE
  There is a paucity of evidence demonstrating that emergency department (ED) ultrasound changes clinical practice in trauma patients. We hypothesized that the presence of ultrasound would affect clinical decision making as evidenced through abdominal computed tomographic (CT) scan use in blunt multiple trauma patients.
  
  
  METHODS
  This study used a prospective randomized format in an urban county ED with Level II trauma center status (ED census, 72,000 patients per year). Participants were patients with multiple blunt injuries meeting trauma center triage criteria. Patients were randomized to receive either abdominal ultrasound or no ultrasound (control) during initial ED resuscitation. The primary outcome variable was use of abdominal CT scan in patients with and without ultrasound.
  
  
  RESULTS
  Two hundred eight patients were enrolled. The mean age was 40 +/- 18 years, and 62% were men. Mechanism of injury was motor vehicle crash, 56%; automobile versus pedestrian, 18%; motorcycle crash, 16%; falls, 10%; and other, 10%. One hundred four ultrasound and 104 control patients were analyzed. There were no apparent differences between ultrasound and control groups in demographics, injury type, or Injury Severity Score. Fifty-four of 104 (52%) of the control group received abdominal CT scans versus 37 of 104 (36%) abdominal CT scans for the ultrasound group; mean difference in proportions was 15.9 (p < 0.01; 95% confidence interval, 2.6-29.1).
  
  
  CONCLUSIONS
  In this trial, the routine use of abdominal ultrasound in the evaluation of patients with multiple blunt injuries resulted in significantly fewer abdominal CT scans being obtained. A larger trial is needed to more clearly define the clinical and financial impact of ultrasound in the management of blunt abdominal trauma.
authors.affiliation: Division of Emergency Medicine, University of California-Davis Medical Center, 2315 Stockton Blvd., Sacramento, CA 95817, USA. jsrose@ucdavis.edu
authors.forename: J S
authors.initials: JS
authors.lastname: Rose
authors.forename: M A
authors.initials: MA
authors.lastname: Levitt
authors.forename: J
authors.initials: J
authors.lastname: Porter
authors.forename: A
authors.initials: A
authors.lastname: Hutson
authors.forename: J
authors.initials: J
authors.lastname: Greenholtz
authors.forename: F
authors.initials: F
authors.lastname: Nobay
authors.forename: W
authors.initials: W
authors.lastname: Hilty
mesh_terms: D000007:Abdominal Injuries / Q000000981:diagnostic imaging*; D000328:Adult; D002140:California; D004636:Emergency Service, Hospital; D005260:Female; D006801:Humans; D015601:Injury Severity Score; D008297:Male; D011446:Prospective Studies; D012151:Resuscitation; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed; D014193:Trauma Centers; D014463:Ultrasonography; D014949:Wounds, Nonpenetrating / Q000000981:diagnostic imaging*