Transvenous pacemaker and/or defibrillator lead placement into the left heart chambers is
rarely done. Approximately a third of such cases reported in the literature presented with signs
of thromboembolism, mostly neurological deficits. We describe a patient who presented with
a cerebrovascular accident three months after inadvertent and unrecognized lead placement
into the left atrium and ventricle through a sinus venosus atrial septal defect. Implant techniques
to avoid this complication are discussed. (Cardiol J 2011; 18, 2: 197-199
