title: The association of dispatch prioritization and patient acuity.
abstract: BACKGROUND
  EMS systems use call prioritization to distinguish between high and low acuity patients, better use resources, and set system response times. Previous research focused on patient condition; however, recent research has reviewed patient acuity as an important maker for system response. Our objective was to analyze any trend between priority dispatch determinant codes and using a red lights and siren (RLS) transport from the scene.
  
  
  METHODS
  Retrospective cohort observational study of 9-1-1 calls received in CY 2003. Chi-square analysis for trend and odds ratios with 95% CI were calculated to evaluate the differences in proportions of patients being transported RLS from the scene according to determinant level, p < 0.05 was considered significant.
  
  
  RESULTS
  There was significant heterogeneity among the determinant cohorts (chi-square = 204.477, p < 0.001, 5 df). Further analysis showed absolute and proportional increases in RLS transport from the scene with increasing determinant level. The three lowest determinant levels were low risk (OR 0.13, 0.49, and 0.58), and the two highest determinant levels had significant risk for RLS transport (OR 1.63, 32.11).
  
  
  CONCLUSIONS
  Patients had increasing likelihood of being transported by RLS from the scene with increasing determinant level. Calls with the two highest determinant levels were at significant risk of being transported RLS from the scene.
authors.affiliation: Department of Emergency Medicine, Washington Hospital Center, Georgetown University School of Medicine, USA. alexgarza@cox.net
authors.forename: Alex G
authors.initials: AG
authors.lastname: Garza
authors.forename: Matthew C
authors.initials: MC
authors.lastname: Gratton
authors.forename: James
authors.initials: J
authors.lastname: McElroy
authors.forename: Daniel
authors.initials: D
authors.lastname: Lindholm
authors.forename: Ernest
authors.initials: E
authors.lastname: Glass
mesh_terms: D016009:Chi-Square Distribution; D004631:Emergency Medical Service Communication Systems / Q000458:organization & administration*; D004632:Emergency Medical Services / Q000706:statistics & numerical data*; D006292:Health Priorities / Q000145:classification*; D006801:Humans; D012189:Retrospective Studies; D012720:Severity of Illness Index; D013997:Time Factors; D014187:Transportation of Patients / Q000706:statistics & numerical data*; D014505:Urban Population