title: The diagnostic yield of commonly used investigations in pelvic gunshot wounds.
abstract: Patients who sustain pelvic gunshot wounds (GSWs) are at significant risk for injury owing to the density of pelvic structures. Currently, the optimal workup for pelvic GSWs is unclear. The aims of this study were to determine the diagnostic yield of tests commonly used in the investigation of pelvic GSWs and to develop a diagnostic algorithm.
  
  
  
  All patients 15 years or older presenting to the Los Angeles County + University of Southern California Medical Center (January 2008 to February 2015) who sustained one or more pelvic GSWs were retrospectively identified. Patients' demographics, clinical assessment, investigations, procedures, and outcomes were abstracted. The diagnostic yield of computed tomographic (CT) scan, cystogram, gross inspection of the urine, urinalysis, endoscopy, and digital rectal examination (DRE) in the detection of clinically significant injuries to the pelvis were calculated.
  
  
  
  Three hundred seventy patients were included. Patients with peritonitis, hemodynamic instability, an unevaluable abdomen, or evisceration were taken to the operating room for immediate laparotomy (n = 138 [37.3%]). All others (n = 232 [62.7%]) underwent CT scan and further investigations as indicated. The sensitivity, specificity, positive predictive value, and negative predictive value of the investigations were CT scan: 1.00, 0.98, 0.74, and 1.00; cystogram: 1.00 for all parameters; gross inspection of the urine: 1.00 for all parameters; urinalysis: 1.00, 0.71, 0.17, and 1.00; endoscopy: 1.00, 0.82, 0.75, and 1.00; and DRE: 0.77, 0.99, 0.77, and 0.99.
  
  
  
  In the workup of pelvic GSWs, patients with hemodynamic instability, peritonitis, evisceration, or an unevaluable abdomen should undergo immediate laparotomy, while all others should undergo CT scan. Computed tomography-positive patients should be managed for their injuries. If the CT is negative, the likelihood of a clinically significant injury is very low. If the CT is equivocal for rectal or bladder injury, endoscopy or cystogram should be used to guide definitive management. There is no role for routine urinalysis or DRE. Further prospective validation of these findings is warranted.
  
  
  
  Diagnostic study, level III; therapeutic study, level IV.
authors.affiliation: From the Division of Trauma and Surgical Critical Care, Los Angeles County + University of Southern California Medical Center, University of Southern California, Los Angeles, CA (M.S., K.I., E.M.P., J.D., M.D.W., L.L., E.B., D.D.).
authors.forename: Morgan
authors.initials: M
authors.lastname: Schellenberg
authors.forename: Kenji
authors.initials: K
authors.lastname: Inaba
authors.forename: Erika M
authors.initials: EM
authors.lastname: Priestley
authors.forename: Joseph
authors.initials: J
authors.lastname: Durso
authors.forename: Monica D
authors.initials: MD
authors.lastname: Wong
authors.forename: Lydia
authors.initials: L
authors.lastname: Lam
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Benjamin
authors.forename: Demetrios
authors.initials: D
authors.lastname: Demetriades
mesh_terms: D000007:Abdominal Injuries / Q000175:diagnosis* / Q000601:surgery; D000293:Adolescent; D000328:Adult; D000368:Aged; D000070621:Cystography; D051517:Digital Rectal Examination; D004724:Endoscopy; D005260:Female; D006801:Humans; D015141:Los Angeles / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D010388:Pelvis / Q000293:injuries*; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D016482:Urinalysis; D014948:Wounds, Gunshot / Q000175:diagnosis* / Q000601:surgery