Fig. 1From: Impact of an emergency medical dispatch system on survival from out-of-hospital cardiac arrest: a population-based studyEmergency medical service system in the Northern French Alps Emergency Network. In the area with the single dispatch centre system, there are 92 BLS ambulances in 89 rescue centres for a population of 782,900 inhabitants in 4388 km2. In the area with the multiple dispatch centre system, there are 216 BLS ambulances in 208 rescue centres for a population of 1,556,600 inhabitants in 13,459 km2. The number of ambulances per inhabitant : 11.8 ambulances/100.000 inhabitants in the single dispatch centre system and 13.9 ambulances/100.000 inhabitants in the multiple dispatch centre system. BLS ambulance are evenly distributed to cover the entire area with a maximum on-site time of 20 min.BLS: basic life support; FD: fire department; EMS: emergency medical serviceBack to article page