Software error resulting in malfunction of an implantable cardioverter defibrillator

Software Error. Loss of ventricular output resulting from an unexpected sof tware error in a dual chamber implantable cardioverter defibrillator (ICD) is reported, A 70-year-old man with a dual chamber ICD implanted for a hist ory of cardiac arrest and infra-Hisian bloch-presented with acute onset of dizziness. He was found to have loss of ventricular output due to an intern al software problem, The problem was corrected by software reprogramming vi a the programmer. This malfunction exemplifies the potential ability to cor rect current-generation ICD software problems noninvasively, thus avoiding the need for replacement.