Impact of ambulance life support on outcomes of cardiovascular emergencies.
D000552:Ambulances; D003327:Coronary Disease / Q000628:therapy*; D004632:Emergency Medical Services / Q000458:organization & administration / Q000592:standards*; D005069:Evaluation Studies as Topic; D005500:Follow-Up Studies; D006801:Humans; D010043:Outcome and Process Assessment, Health Care; D013686:Telemetry; D013781:Texas