No. Although they are given negative press and publicity, true device malfunctions are not common and are on the order of 1% depending on the severity of the malfunction. In some patients, the less severe malfunctions can be as high as 6%. Compared to the benefits pacemakers and defibrillators provide, their risk of malfunction is very small. Malfunctions can include failure of the device to perform, disruption of the computer or the wires either microscopically or physically, infection of the device site or simply the device needing to be reprogrammed because it is giving unnecessary treatments or not giving enough treatments. Correcting malfunctions usually involves simple computer programming changes, which are accomplished wirelessly. Certain malfunctions do require replacement or removal of the wires and/or the computer, although these types of malfunctions are less common.