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Pacemaker lead endocarditis — ABIM Board MCQ

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HardCardiovascularPacemaker lead endocarditisABIM Board

A 68-year-old man with a dual-chamber pacemaker implanted 4 years ago is hospitalized with fever and malaise. Four blood-culture bottles grow methicillin-susceptible Staphylococcus aureus, and no alternative source of bacteremia is identified. Transesophageal echocardiography shows a mobile echodensity attached to the right atrial lead without valvular vegetation. The generator pocket has no erythema, tenderness, drainage, or erosion. He is hemodynamically stable, and follow-up cultures become negative within 48 hours after cefazolin is started. Which of the following is the most appropriate management?

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Correct answer: B — Promptly remove the generator and all transvenous leads while continuing intravenous cefazolin

Multiple positive MSSA cultures together with a lead-associated vegetation establish systemic cardiovascular implantable electronic device infection. Management requires prompt removal of the generator and all leads plus pathogen-directed intravenous antibiotics; a normal-appearing pocket does not exclude endovascular infection. Clearance of bacteremia after cefazolin does not eliminate organisms embedded in device biofilm. Adding rifampin while retaining the system is not an adequate substitute for source control. Generator exchange alone leaves the infected intravascular lead in place. Antibiotics alone carry a substantial risk of relapse, and waiting for recurrent bacteremia or enlargement on repeat echocardiography unnecessarily delays definitive treatment. Reimplantation, if still indicated, occurs later after adequate culture clearance and infection control.

Reference: American Heart Association, Cardiac Implantable Electronic Device (CIED) Infection Toolkit, evidence-based diagnostic and treatment strategies, 2023. https://www.heart.org/en/-/media/Files/Professional/Quality-Improvement/National-CIED-Infection-Initiative/CIED-Infection-Initiative-Toolkit.pdf