title: Dispatchers impression plus Medical Priority Dispatch System reduced dispatch centre times in cases of out of hospital cardiac arrest. Pre-alert--a prospective, cluster randomized trial.
abstract: OBJECTIVE
  Dispatch centre processing times for out-of-hospital cardiac arrest or critically ill patients should be as short as possible. A modified 'pre-alert' dispatch workflow might be able to improve the processing time.
  
  
  METHODS
  Between October 2010 and May 2011 dispatch events, suspicious for cardiac arrest, were prospectively randomized in 24h clusters. The emergency medical service of the intervention group got, based on the dispatchers impression, a 'pre-alert' alarm-message followed by the standard Medical Priority Dispatch System query whereas the control group did not.
  
  
  RESULTS
  In 225 clusters 1500 events were eligible for analysis. Data are presented as median and 25-75 interquartile ranges. Per-protocol analysis demonstrated for the intervention group on 'pre-alert' days a median processing time of 143 s (109-187; n=256) versus 198 s (167-255; n=502) in the control group on non 'pre-alert' days, with a difference of 0.23 log-seconds (p<0.001; 95% CI 0.74-0.28). In critical ill patients, intention-to-treat analysis showed for the intervention group a median of 168 s (131-264; n=153) versus 239 s (176-309; n=164) in the control group, with a difference of 1.4 log-seconds (p<0.001; 95% CI 1.25-1.55).
  
  
  CONCLUSIONS
  Dispatch times can effectively be reduced in cases of out-of-hospital cardiac arrest or critical ill patients with a 'pre-alert' dispatch workflow in combination with the Medical Priority Dispatch System protocol. This might play an important role in improving patient care.
authors.affiliation: Department of Emergency Medicine, Medical University of Vienna, Austria.
authors.forename: Christoph
authors.initials: C
authors.lastname: Weiser
authors.forename: Raphael
authors.initials: R
authors.lastname: van Tulder
authors.forename: Mathias
authors.initials: M
authors.lastname: Stöckl
authors.forename: Andreas
authors.initials: A
authors.lastname: Schober
authors.forename: Harald
authors.initials: H
authors.lastname: Herkner
authors.forename: Christof C
authors.initials: CC
authors.lastname: Chwojka
authors.forename: Alexander
authors.initials: A
authors.lastname: Hopfgartner
authors.forename: Heinz
authors.initials: H
authors.lastname: Novosad
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Schreiber
authors.forename: Fritz
authors.initials: F
authors.lastname: Sterz
mesh_terms: D001317:Austria; D004631:Emergency Medical Service Communication Systems / Q000458:organization & administration*; D004632:Emergency Medical Services / Q000458:organization & administration; D006801:Humans; D058687:Out-of-Hospital Cardiac Arrest / Q000175:diagnosis*; D011446:Prospective Studies; D012424:Rural Population; D013997:Time Factors; D014218:Triage / Q000379:methods