A drone which could deliver a defibrillator to a person suffering from a cardiac arrest is being tested by the Karolinska Institute in Sweden.

Trial flights have the shown the drones can arrive at a destination four times faster than an ambulance.

After cardiac arrest, the chances of survival decrease by 10% for every minute that an individual goes without cardiopulmonary resuscitation (CPR) or defibrillation.

Some 300,000 people die of cardiac arrest in Europe each year.

BBC Click finds out more.

See more at Click's website and @BBCClick.