title: Positive FAST without hemoperitoneum due to fluid resuscitation in blunt trauma.
abstract: BACKGROUND
  The focused assessment with sonography in trauma (FAST) examination is an important screening tool in the evaluation of blunt trauma patients.
  
  
  OBJECTIVE
  To describe a case of a hemodynamically unstable polytrauma patient with positive FAST due to fluid resuscitation after blunt trauma.
  
  
  METHODS
  We describe a case of a hemodynamically unstable polytrauma patient who underwent massive volume resuscitation prior to transfer from a community hospital to a trauma center. On arrival at the receiving institution, the FAST examination was positive for free intraperitoneal fluid, but no hemoperitoneum or significant intra-abdominal injuries were found during laparotomy. In this case, it is postulated that transudative intraperitoneal fluid secondary to massive volume resuscitation resulted in a positive FAST examination.
  
  
  CONCLUSIONS
  This case highlights potential issues specific to resuscitated trauma patients with prolonged transport times. Further study is likely needed to assess what changes, if any, should be made in algorithms to address the effect of prior resuscitative efforts on the test characteristics of the FAST examination.
authors.affiliation: Department of Emergency Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
authors.forename: Jonathan E
authors.initials: JE
authors.lastname: Slutzman
authors.affiliation: Department of Emergency Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
authors.forename: Lisa A
authors.initials: LA
authors.lastname: Arvold
authors.affiliation: Department of Emergency Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
authors.forename: Joshua S
authors.initials: JS
authors.lastname: Rempell
authors.affiliation: Department of Emergency Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
authors.forename: Michael B
authors.initials: MB
authors.lastname: Stone
authors.affiliation: Department of Emergency Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
authors.forename: Heidi H
authors.initials: HH
authors.lastname: Kimberly
mesh_terms: D005189:False Positive Reactions; D005260:Female; D005440:Fluid Therapy / Q000009:adverse effects*; D006465:Hemoperitoneum / Q000000981:diagnostic imaging* / Q000209:etiology; D006801:Humans; D009104:Multiple Trauma / Q000000981:diagnostic imaging*; D019095:Point-of-Care Systems; D012151:Resuscitation / Q000379:methods*; D014463:Ultrasonography; D014949:Wounds, Nonpenetrating / Q000000981:diagnostic imaging*; D055815:Young Adult
keywords: FAST; blunt trauma; resuscitation; ultrasound