RESUMO
As part of the emergency medical care system, helicopter emergency medical services (HEMS) have a different crew composition from the traditional team. HEMS consist of a pilot, doctor, and firefighter with rescue skills and training in basic life support on board an air ambulance. This allows the adaptation to different environments and increases the varieties of air procedures normally performed. HEMS began operating relatively recently in Buenos Aires. Yet, in 3 years, its use grew to such an extent that in 2015 it tripled, and by 2016 the number of medical assists was 4 times greater than in 2014. Furthermore, over the 3-year study period, 92% to 95% of assisted victims were traffic accident casualties requiring primary care. The HEMS crew is informed about the availability of resources in the acute care general hospitals and can therefore transfer patients to the most appropriate trauma center in the shortest time. However, 75% to 85% of the time, the choice of destination is strongly influenced by the availability of a helipad and the operational safety that it provides.