If CPR is done right ~10% will walk out of the hospital. But that's a big if! Must be near a trained bystander. AED is much better on shockable rhythms, ~70%. Unfortunately most out-of-hospital cardiac events occur in homes which rarely have access to a device.

In 2021, a drone-delivered AED was used to successfully shock a 71-year-old man back into a stable rhythm in Sweden. The drone delivered the AED in just over three minutes from a 911 call.

Studying years of emergency drone data back up the anecdotes. The AED gets there 10-15 min ahead of medics and boosts survival 70%.