title: Accuracy of determining cardiac arrest by emergency medical dispatchers.
abstract: OBJECTIVE
  To identify and determine the rates of delivery and performance of telephone CPR in noncardiac arrest incidents.
  
  
  METHODS
  We studied prospectively all out-of-hospital cardiac arrest and potential cardiac arrest incidents from July 1 through October 31, 1992.
  
  
  METHODS
  King County, Washington, excluding the city of Seattle.
  
  
  METHODS
  Persons with cardiac arrest or an initial complaint resembling cardiac arrest who received emergency medical services.
  
  
  METHODS
  Dispatcher-assisted telephone CPR.
  
  
  RESULTS
  Three hundred fifty-eight incidents of cardiac arrest, respiratory arrest, and potential cardiac arrest were reviewed. Telephone CPR was offered appropriately in 61 of 87 cases (70%) and inappropriately in eight of 154 potential cardiac arrests (5.2%) (95% confidence interval, 1.7%, 8.7%). Ventilation instructions were performed appropriately in 52 of 87 cases (60%) and inappropriately in three of 154 potential cardiac arrests (1.9%) (95% confidence interval, 0%, 4.1%). Chest compressions were performed appropriately in 26 of 68 cardiac arrests (38.2%) and inappropriately in two of 173 potential cardiac arrests (1.2%) (95% confidence interval, 0%, 2.8%).
  
  
  CONCLUSIONS
  We found a low rate of performance of telephone CPR in King County for incidents resembling cardiac arrest. This finding suggests that the protocols designed for dispatcher-assisted telephone CPR effectively screen out those incidents that may initially resemble cardiac arrest.
authors.affiliation: Center for Evaluation of Emergency Medical Services, University of Washington, Seattle.
authors.forename: J J
authors.initials: JJ
authors.lastname: Clark
authors.forename: L
authors.initials: L
authors.lastname: Culley
authors.forename: M
authors.initials: M
authors.lastname: Eisenberg
authors.forename: D K
authors.initials: DK
authors.lastname: Henwood
mesh_terms: D000328:Adult; D000368:Aged; D016887:Cardiopulmonary Resuscitation / Q000193:education* / Q000379:methods; D002648:Child; D002985:Clinical Protocols; D016001:Confidence Intervals; D004631:Emergency Medical Service Communication Systems; D004632:Emergency Medical Services / Q000592:standards*; D005260:Female; D005392:First Aid; D006323:Heart Arrest / Q000175:diagnosis* / Q000453:epidemiology / Q000628:therapy; D006801:Humans; D008297:Male; D011446:Prospective Studies; D014861:Washington