Shock therapy. How donut magnets can suspend inappropriate ICD shocks.

EMS crews encounter implantable cardioverter defibrillators (ICDs) daily, but these encounters rarely involve ICDs firing repeatedly on an awake, alert and understandably frightened individual. But that's exactly what happened when an EMS crew from Cottage Grove, Minn., responded to a man with a known heart condition who reported that his implantable defibrillator was firing inappropriately.