Defibrillator storm: A condition that arises when a defibrillator implanted in the chest to correct an arrhythmia (an abnormal heart rhythm) fires off frequently --sometimes several times a day or even more often -- each time with a jolt like a boxer's punch to the chest, because of far advanced heart disease. Defibrillator storm is an uncommon but grave complication with an implantable defibrillator (a device that can profitably prolong a patient's life but can also make a patient's life painful.)
