Air medical services

Air medical services use various aircraft to provide urgent medical care to patients. These services include both fixed-wing aircraft and helicopters. They are used for prehospital, emergency, and critical care during aeromedical operations. Aeromedical operations involve the transport of patients by air.

Some aircraft are specially outfitted to act as flying hospitals. These air ambulances carry vital equipment like medications, ventilators, and ECG monitors. They also carry stretchers and CPR equipment. A medically staffed aircraft provides care while in flight. In contrast, a non-medically staffed aircraft only provides transport without active care.

There are different ways to classify these medical flights. Military organizations use specific terms to distinguish between types of transport. They call medical evacuation, or MEDEVAC, the use of medically staffed aircraft. They call casualty evacuation, or CASEVAC, the use of aircraft that simply transport patients without medical care.

In civilian life, air ambulances are often chosen for their speed. They can cover much larger areas than a standard land ambulance. This makes them essential for people living in sparsely populated rural areas. They are also vital for major trauma injuries where every minute counts.

One important concept in emergency medicine is the golden hour. This is a theory suggesting that trauma patients need rapid transport to a specialist center.

A helicopter can help by bringing specialist doctors directly to the scene. The crew can provide high-level care immediately. Then, they can fly the patient to a trauma center much faster than a car. This can also help move patients from small community hospitals to larger trauma centers. However, air medical services are expensive and must be used carefully to be cost-effective. If an air ambulance is sent to a patient near a hospital, it might actually cause a delay.

Research has explored whether these services always improve outcomes. In 1996, a study in England and Wales found no evidence that air ambulances improved vehicle response times. The study also found that patients did not arrive at the hospital any faster. Looking at health outcomes in Cornwall and London, researchers found no evidence that HEMS, or Helicopter Emergency Medical Service, improved survival for trauma patients. Because of this, ground responders must use strict protocols. They must decide if a patient's condition truly requires an expensive flight.

Safety is the single most important factor in deciding to fly. Pilots and medical crews must consider weather, air traffic, and distance. Flying at night or in bad weather increases the risk of fatal crashes. Crew comfort and the potential for postcrash fires are also serious concerns.

If criteria for flying are too strict, patients might not get help quickly. If the criteria are too relaxed, crews might face unnecessary aviation risks. When an air ambulance is actively operating with a patient, air traffic control gives it priority. These aircraft use the call sign MEDEVAC to receive special treatment in the air.

The history of air medical services began with military necessity. Many historians believe the first true mission happened during World War I. A French Air Service plane flew a Serbian officer from a battlefield to a hospital. French records show this helped reduce the mortality rate of injured soldiers from 60% to 10%. In 1917, a British ambulance flight in Turkey moved a soldier in 45 minutes.

Before this flight, the same journey by land would have taken three days. During the Korean War, the Bell H-13 became the first dedicated MEDEVAC aircraft. Later, in the Vietnam War, researchers found that wounded servicemen had better survival rates than motorists on California freeways. This discovery inspired the first civilian paramedic experiments.

Civilian services grew from the needs of remote communities. In places like Northern Canada, Australia, and Scandinavia, roads are often blocked. In Norway, many people rely on boats to travel between towns. Early "bush" pilots often performed the first unofficial air ambulance trips.

Formal services began to appear in the 1920s. Sweden and Siam established systems in the early 1920s. In 1928, John Flynn founded the Flying Doctor Service in the Australian outback. In 1934, Marie Marvingt started Africa's first civil air ambulance in Morocco. Even Scotland established a service for the Highlands and Islands in 1936. Today, the field continues to evolve, with NATO even investigating unpiloted aerial vehicles for casualty evacuation.