Automatic external defibrillators (AEDs) are machines that are designed to be used by non-medical personnel in the event of a witnessed sudden collapse.  The AED is connected to the chest of the patient and automatically detects the patient's heart rhythm.  If the AED detects a rhythm that requires an electric shock, the AED delivers the shock and monitors the rhythm until paramedics arrive.  The time between collapse and delivery of the first shock is critical to survival.  So it was hoped that...