Time to defibrillation is the most important predictor of survival in cardiac arrest. Traditional emergency medical system response is often to slow. The aim of this study is to investigate the feasibility of drone systems that delivers Automated External Defibrillators (AED) to the scene of suspected Out-of-Hospital Cardiac Arrests (OHCA).

This study will test the feasibility of real-life flights with drones carrying automated external defibrillators (AEDs) to out-of-hospital cardiac arrest (OHCA) as a complement to standard care i.e EMS

We will test the feasibility of dispatching an out of sight AED-drone system to real-life OHCA in parallel with standard EMS dispatch. The study period is 5 months between May to September 2020. The study area will be covered by three individual drone systems covering some 80,000 inhabitants within the controlled airspace of Säve airport in Göteborg Sweden. Each drone system will have a flight range of six km.

The first month of the study period will be used as run-in period and the drone systems are dispatched for beyond visual line of sight (BVLOS) flights in a simulated fashion and optimized to decrease delays and to log pre-specified system variables, adherence to protocol, time delays, technological functionality, weather conditions, conflict in the airspace.

During the following 4 months June-September 2020, drones will dispatched to real-life suspected OHCA during daytime 08:00-22:00.

An EMS communication radio-unit is placed at the drone control center. In case of a suspected OHCA in the service area and will be alerted by the dispatch centre (SOS alarm) when a suspected OHCA is recognized during the 112-call.

• The dispatcher identifies a cardiac arrest in the service areas
• A pilot (from Everdrone) immediately initiates deployment protocol for the drone.
• Parallel communication is made with the air traffic control (ATC) centre in order to grant permit to deploy the drone with regards to the current weather and aviation situation.
• The drone then flies to the coordinates of the OHCA and delivers an AED at the scene using a winch system
• The AED may be attached to the patient by the bystander on scene

Development of the technology is made by Everdrone AB Göteborg and SOS Alarm AB (national dispatch organisation) and parallel applications for certificates for the individual aircraft and permits for beyond visual line of sight flights (BVLOS-flights) was granted by the Swedish Transportation board on 27 April 2020.

The drone system is operated only during daytime 08:00-22:00 when the Airport Air traffic control is open. Likewise deployment of the drone will not be made if there is a conflict in the airspace with manned aircrafts. Rainy weather or winds exceeding 8 m/s prohibits flights as well.

Feasibility is evaluated and measured from the following aspects:

1. Operational factors Weather: a) rain, b) wind c) other. Conflict in airspace: a) manned aircraft b) unmanned aircraft. Obstacles prohibiting flight or delivery: a) constructed b) natural Time from dispatch to to take- off (min:sec). Time from dispatch to arrival (min:sec). Proportions are measured out of cases with a) Take-off b) no take-off c) aborted missions (%)
2. Human resources Adherence to protocol by: a) Dispatcher b) Drone pilot c) Air traffic leader. Proportions are measured out of cases with neglected protocol prohibiting mission completion, a) no alerts b) no take off c) aborted missions (%)
3. Technological functionality Drone, winch, Network, AED, Hangar, navigational software, global positioning system precision, Dispatch centre system (CoordCOM -Dispatch centre automated alert).

Proportions are measured out of cases where technological functionality prohibited mission completion a) no take-off b) aborted missions. (%)

Adverse advents (AE) and serious adverse events (SAE) in relation to AED-drone mission /use will be logged continuously. An adverse event may be caused by drone crash or risc of injury or death due to conflict in airspace or technological impairment.

An AE is considered serious if it:

• Results in death
• Is immediately life-threatening
• Requires hospitalisation or prolongation of existing hospitalization
• Results in persistent or significant disability or incapacity

Events that are related to the patient in cardiac arrest and would be expected in patients undergoing attempted resuscitation should NOT be reported. These include:

• Death
• Hospitalisation
• Persistent or significant disability or incapacity
• Organ failure

All events categorised as serious must be reported to the study administration within 24 hours of becoming aware of the event.

Inclusion Criteria:

• All suspected OHCA
• Within n=3 service areas
• Hours of operation: 08:00-22:00

Exclusion Criteria:

• Children <8 years
• Trauma
• EMS-witnessed cases