Why your cardiologist might tell you to skip AirPods

My Agency/Shutterstock Next time you visit your grandparents, you might want to put your headphones away. Cardiologists have long warned about the risks smartphones, headphones and other consumer devices pose towards cardiovascular implantable devices (CIDs). Concerns revolve around the magnetic fields these devices emit, which can inadvertently trigger a magnet-safe mode on defibrillators and pacemakers that potentially prevents them from detecting tachycardia or other cardiovascular irregularities.

Modern CIDs are designed to automatically switch into this mode when near strong magnetic fields to ensure patient safety during magnet-intensive medical procedures like MRIs. And while CIDs are designed to return to normal after the magnetic field is removed, even a temporary disruption can have major consequences.

For those whose hearts have yet to become bionic, CIDs typically switch into magnet mode when they encounter a magnetic induction field of 10 Gauss or more. For reference, your aunt's souvenir fridge magnet from her trip to Palm Beach likely emits a magnetic field of 100 Gauss. A relatively manageable problem when CIDs were first designed, the mass proliferation of small rare-earth magnets across consumer electronics has begun to pose unique risks to medical implants.