Defibrillators by drone: could aid heart emergencies

It sounds futuristic: drones carrying heart defibrillators swooping in to help bystanders revive people stricken by cardiac arrest.

Researchers tested the idea and found drones arrived at the scene of 18 cardiac arrests within about 5 minutes of launch. That was almost 17 minutes faster on average than ambulances - a big deal for a condition where minutes mean life or death.

Drone-delivered devices weren’t used on patients in the preliminary study, but the results are “pretty remarkable” and proof that the idea is worth exploring, said Dr. Clyde Yancy, a former American Heart Association president who was not involved in the study.

Cardiac arrest is a leading cause of death worldwide, killing more than 6 million people each year. Most happen at home or in other nonmedical settings and most patients don’t survive.

“Ninety per cent of people who collapse outside of a hospital don’t make it. This is a crisis and it’s time we do something different to address it,” said Yancy, cardiology chief at Northwestern University’s medical school in Chicago.

The researchers reached the same conclusion after analyzing cardiac arrest data in Sweden, focusing on towns near Stockholm that don’t have enough emergency medical resources to serve summer vacationers. The analysis found an emergency response time of almost 30 minutes and a survival rate of zero, said lead author Andreas Claesson, a researcher at the Center for Resuscitation Science at Karolinska Institute in Stockholm.

To see if care could be improved, Claesson’s team turned to drones.

Drones are increasingly being tested or used in a variety of settings, including to deliver retail goods to consumers in remote areas, search for lost hikers and help police monitor traffic or crowds. Using them to speed medical care seemed like a logical next step, Claesson said.

The study was done last October and was published Tuesday in the Journal of the American Medical Association.