There’s an interesting article on Nerdoholic about a flying defibrillator.
The drone tracks emergency mobile calls and uses the GPS to navigate. Once at the scene, an operator, like a paramedic, can watch, talk and instruct those helping the victim by using an on-board camera connected to a control room via a livestream webcam.
Drones can clearly be more than a way to convey the material; they can also project the expertise of an emergency medical professional. There are many imaginable cases where it would be difficult to pre-position materials and expertise that would be required to save a life, from floating devices to blood clotting agents to chemical burn treatments.