Defibrillator Lead Replacement Surgery Could Be Fatal Just over two months ago Medtronic warned doctors and about 250,000 patients that a lead that is used to connect a defibrillator to the heart could potentially fracture. The leads, called Sprint Fidelis, were recalled by Medtronic on October 15, 2007 after reports of fractures, unnecessary shock... Similar Editorial : The Most Fatal Killer by JoannC. | Source : Lowering High Blood Pressure