There is a version of cardiac arrest that is highly survivable. The heart falls into a chaotic rhythm; a shock can reset it; the device that delivers the shock talks the user through every step and will refuse to fire if a shock is not needed. The medicine is settled. A frightened stranger with no training can carry it out.
And yet survival from cardiac arrest outside a hospital remains low almost everywhere. The reason is not that we lack the treatment. It is that we cannot reliably get the treatment to the person in the handful of minutes during which it works.
That is not a medical problem. It is a logistics problem.
The clock is the whole game
Survival falls fast with every minute that passes before defibrillation. The medicine does not change; the arithmetic of time does. So the questions that decide outcomes are not clinical. They are questions of distance, access, and coordination: Is there a working device close enough to matter? Can someone find it, reach it, and get back in time? Is a trained responder already nearer than the ambulance? Does anyone know an arrest is happening at all?
Each of these is a question about a system, not a symptom. And systems can be designed.
Where height makes the point
Consider a tall building. The device in the lobby may be a hundred metres away by map and five minutes away by lift, stairwell, and locked door. Research on high-rise arrests has found survival falling with the floor a patient is on — not because the medicine works differently upstairs, but because time-to-treatment stretches with every vertical metre.
Nothing about the patient changed. The building did. That is the clearest possible statement that this is a logistics problem wearing a medical costume.
What follows from taking it seriously
If the constraint is logistics, then the work is logistics: knowing where the working devices are, shortening the path to them, and putting the nearest capable person in motion before the ambulance can arrive. Devices matter, but a device no one can reach in time is inventory, not readiness.
This is the unfashionable half of saving these lives — the coordination, the counting, the plain infrastructure. It is also the half that is missing. So it is the half worth building.