title: 'Call fast, Call 911': a direct mail campaign to reduce patient delay in acute myocardial infarction.
abstract: OBJECTIVE
  A 10-month direct mail campaign was implemented to increase use of emergency medical services via 911 calls and to reduce prehospital delay for individuals experiencing acute myocardial infarction symptoms.
  
  
  METHODS
  This prospective, randomized, controlled trial involved three intervention groups (receiving brochures with informational, emotional, or social messages) and a control group.
  
  
  RESULTS
  Intervention effects were not observed except for individuals who had a history of acute myocardial infarction and who were discharged with a diagnosis of acute myocardial infarction; their 911 use was meaningfully higher in each intervention group than in the control group.
  
  
  CONCLUSIONS
  The mailings affected only the individuals at greatest risk.
authors.affiliation: Center for Evaluation of Emergency Medical Services, Seattle-King County Department of Public Health, Wash. 98104-4039, USA.
authors.forename: H
authors.initials: H
authors.lastname: Meischke
authors.forename: E M
authors.initials: EM
authors.lastname: Dulberg
authors.forename: S S
authors.initials: SS
authors.lastname: Schaeffer
authors.forename: D K
authors.initials: DK
authors.lastname: Henwood
authors.forename: M P
authors.initials: MP
authors.lastname: Larsen
authors.forename: M S
authors.initials: MS
authors.lastname: Eisenberg
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004632:Emergency Medical Services / Q000706:statistics & numerical data*; D005260:Female; D006293:Health Promotion / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000523:psychology / Q000628:therapy; D010174:Pamphlets; D010342:Patient Acceptance of Health Care; D011177:Postal Service; D011446:Prospective Studies; D012042:Registries; D013997:Time Factors; D014861:Washington