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HEMS Definition
      Helicopters have been an indispensable part of EMS (Emergency Medical Service) in many developed countries and regions, and "helicopter emergency medical services" (HEMS), a subsection concept of EMS, was especially proposed. HEMS is an air transportation activity using helicopters to rescue and transport patients under the condition of first-aid and medical monitoring, which has incomparable superiority.
      According to statistics, reasonably using a helicopter equals to the efficacy of more than 10 ambulances, which can save time and a multitude of accessory medical personnel , making it a first aid means of high-efficiency. Patients in a helicopter can feel tiny vibration and accelerated speed. Also, the comfort level of patients in a helicopter is much higher than that in the most advanced ambulance.
       According to task model, HEMS can be classified into two tasks. The first task is first aid, such as using helicopters to transport rescue personnel and equipment to the scene of severe accidents at the first time (golden one hour principle). A helicopter can save time best because it can take off at any time, directly land at the scene and the helipad of hospital roofs.
       The second task is planned inter-hospital transfers and human organ transportation. Helicopters are generally used when transportation time is within 2 hours. This task has high demand on time .Converted fixed wing aircrafts are often used in case of long distance transfers with ambulances to and from airports (even helicopters) doing connection work.
       In western developed countries, HEMS, a large-scale service industry, has been in operation for more than half a century with completed rescue system and network as well as huge aviation rescue industrial chain, which promotes general aviation market.
       From the world perspective, EMS has an important feature in some developed countries: relatively loose airspace regulation, comparatively perfect general aviation development. HEMS is generally used in North America, Europe, some developed regions in Asia (such as Japan, Hong Kong, China) and Oceania.
        HEMS helicopter number and base distribution in main European and American countries
        Compared with developed countries, China's HEMS is still at initial stage, especially HEMS for road traffic accidents, which is still in zero operation.