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Man was clearing thick snow from his driveway when the cardiac arrest hit.
A passing doctor started doing CPR while asking another bystander to call the emergency number.
"Just minutes later, I saw something flying above my head. It was a drone with a defibrillator." explained the doctor.
"... there's a chain of events saving the person's life, and the drone is a very critical part of how that system works" - Mats Sallstrom, Everdrone chief executive, "roughly 60 seconds from the alarm we can be on our way."
The drone is a partnership between the Karolinska Institutet, the national emergency operator SOS Alarm, Region Vastra Gotaland and Everdrone.
In a 2020 study, in western Sweden drones arrived before the ambulances in 7 out of 14 cases.
Everdrone says the system has got a lot faster since then.
Everdrone is in talks to bring the technology to other countries, including the UK.
The system might be used to deliver other urgently needed medical devices.