title: Utilization of ambulance services by patients with acute cardiac emergencies.
mesh_terms: D000208:Acute Disease; D000328:Adult; D000368:Aged; D000552:Ambulances; D004632:Emergency Medical Services / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D008297:Male; D008396:Maryland; D008875:Middle Aged; D009203:Myocardial Infarction / Q000401:mortality / Q000628:therapy*; D014187:Transportation of Patients