maybe it should give them little reminder shocks periodically while the magnet is emplaced? If it's exclusively for disabling it in emergency situations, then a

maybe it should give them little reminder shocks periodically while the magnet is emplaced? If it's exclusively for disabling it in emergency situations, then a tingle every couple of minutes would be the least of the patient's worries. I wonder if it's possible to do that safely without requiring additional electrodes (because shocking the heart itself is probably a bad idea, unless necessary) Edit: Or maybe just a little piezo disc or something; "Oops, daddy's started bleeping again."