Every minute that ticks by without cardiopulmonary resuscitation or a shock from a defibrillator strips a cardiac arrest patient of roughly ten per cent of their chance of survival. It is a brutal calculus that has long haunted emergency medicine. Now, a sweeping new analysis of more than 28,000 cardiac arrests across the Greater Paris region suggests that fleets of autonomous drones could radically rewrite those odds, delivering automated external defibrillators (AEDs) to the scene far faster than any ambulance or bystander on foot.
The research, led by emergency medicine specialists at Henri-Mondor and Lariboisière hospitals, maps a future where technology shrinks the “treatment gap” that currently leaves the vast majority of victims without rapid access to a shock. With survival rates for out-of-hospital cardiac arrests stubbornly stuck below ten per cent in the UK and France alike, the findings offer a concrete, data-driven blueprint for a system that has historically relied on static, often inaccessible, wall-mounted boxes.
The Geography of a Missed Opportunity
The team analysed 28,349 out-of-hospital cardiac arrests recorded between 2011 and 2024 across the administrative districts surrounding the French capital. Central Paris itself was excluded, allowing the researchers to focus on the sprawling suburbs and towns where response times are often longest and public defibrillator density is thinnest.
What they found was a landscape of inequity. Of the 1,893 fixed AEDs logged in the region, only thirty per cent of cardiac arrests occurred within a 500-metre network distance of a device. That figure is not merely a statistic; it represents thousands of real people who collapsed too far from help.
To achieve eighty-four and a half per cent coverage using only fixed units, the region would need an additional 910 devices. For total coverage, the bill rises to 1,712 new installations. In an era of strained public finances, that scale of physical infrastructure expansion is a daunting prospect.
The Drone Advantage: Speed Over Static Hardware
Enter the drone. The modelling explored a network of bases—housed at existing AED sites, fire stations, and mobile intensive care units—from which drones could launch within a 3,900-metre (2.4-mile) radius. The results were striking.
With just one hundred drone bases and a mere twenty-six additional fixed AEDs, more than ninety-seven per cent of the historical cardiac arrest cases would have fallen within reach of a defibrillator, either on the wall or in the sky. Doubling the drone bases to two hundred, supported by only four extra fixed units, pushed theoretical coverage above ninety-nine per cent.
Dr Hillary Minka, an emergency physician at Lariboisière and the study’s first author, put the time savings in stark terms. Current fixed AEDs, retrieved by a bystander running to a cabinet and back, can reach only thirty to forty per cent of victims within the critical five-minute window. The drone model, by contrast, delivered to virtually every covered location within that same timeframe.
The “Defibrillator Desert” Problem
The urgency of the problem extends well beyond the Paris ring road. In the UK, the British Heart Foundation estimates more than 30,000 out-of-hospital cardiac arrests occur annually where resuscitation is attempted. Fewer than one in ten survive. A recent investigation warned that more than sixteen million people in England and Wales live in “defibrillator deserts”—areas where the nearest device is too far away to be useful in an emergency.
Professor Matthieu Heidet of Henri-Mondor university hospital, a senior author on the work, highlighted a hidden flaw in current strategies. “In France, only eight per cent of out-of-hospital cardiac arrest patients benefit from the application of a public AED before the arrival of the emergency services,” he said. A major reason? Accessibility. Countless devices sit behind locked doors in office buildings, gyms, or shopping centres that are shuttered at night or on weekends—precisely when many arrests occur.
Drones bypass the locked door. They do not care about opening hours, security codes, or the physical fitness of the nearest bystander. They fly the device to the patient.
From Simulation to Sky: Lessons from Sweden
This is not science fiction. Sweden has already integrated drone-delivered AEDs into its emergency response system, with documented saves. The operational model is mature: when a dispatch centre identifies a probable cardiac arrest, a trained pilot activates the drone. It follows an automated flight path to the coordinates, with the pilot managing the final approach and release. The AED lands gently, often via a winch or parachute, ready for a bystander to apply the pads under the guidance of the dispatcher.
Heidet stressed that the economics of such a network must be rigorously evaluated. Drones, bases, pilots, and maintenance carry costs that must be weighed against the cost of installing and maintaining thousands of fixed cabinets—many of which will never be used. But the cost-per-life-saved calculation shifts dramatically when a single drone base can cover an area that would otherwise require dozens of static units.
The study, which has not yet undergone peer review, is being presented this weekend at the European Emergency Medicine Congress in Paris. It arrives at a moment when regulators across Europe and the UK are actively drafting frameworks for beyond-visual-line-of-sight drone operations in urban airspace.
Why it Matters
Cardiac arrest is the ultimate time-critical emergency. For decades, the chain of survival has had a weak link: the gap between the 999 call and the first shock. This research demonstrates that the technology to close that gap exists today, not in a laboratory but in the skies over Stockholm and, potentially, soon over London, Birmingham, or Manchester. If health systems can summon the political will and regulatory clarity to deploy these networks at scale, we could finally stop measuring survival in minutes lost and start counting lives saved.
