Thrombosis in the right atrium and ventricle along the course of an implanted catheter pacemaker is a rare occurrence. Subsequent pulmonary emboli complicated congestive heart failure in our patient. Such a complication should be considered when congestive heart failure becomes a prominent problem in patients with implanted catheter pacemaking systems. Prophylactic anticoagulant therapy is not recommended because the problem is still rare in proportion to the number of implanted catheters.
Prozan GB, Shipley RE, Madding GF, Kennedy PA. Pulmonary Thromboembolism in the Presence of an Endocardiac Pacing Catheter. JAMA. 1968;206(7):1564-1565. doi:10.1001/jama.1968.03150070102024