Lead thrombosis is a recognized complication of permanent transvenous pacemaker (PM)
implantation. We present the interesting case of an adolescent with a dual-chamber PM presenting
with fatigue and hypoxemia. Due to limitations of various imaging modalities, the diagnosis was
difficult. She was eventually diagnosed with intracardiac PM lead thrombi obstructing tricuspid
valve inflow. The pediatric literature on PM lead thrombosis is also briefly reviewed.peer-reviewe