In a pacemaker‑dependent patient with an infected leadless pacemaker, what is the recommended management, including device removal, temporary pacing bridge, antimicrobial therapy, and timing of re‑implantation?

Management of Infected Leadless Pacemaker in Pacemaker-Dependent Patients

In a pacemaker-dependent patient with an infected leadless pacemaker, complete device removal is mandatory, followed by immediate temporary pacing bridge (using active-fixation leads connected to external generators), pathogen-directed antimicrobial therapy for at least 14 days after extraction, and delayed re-implantation only after blood cultures remain negative for ≥72 hours (or 14 days if valvular infection is present). 1, 2

Device Removal Strategy

Complete removal of the infected leadless pacemaker is a Class I recommendation and must not be delayed regardless of antimicrobial therapy initiation. 3, 1 The extraction should occur as soon as possible, ideally within 3 days of diagnosis, as early removal is associated with lower in-hospital mortality. 3

• All hardware must be extracted—there is no role for partial removal or antibiotic suppression alone in definite device infection. 1, 2
• Device removal should not be postponed to initiate antibiotics; extraction proceeds immediately upon diagnosis. 3, 2
• Percutaneous extraction is the preferred method and should be performed at high-volume centers with on-site cardiothoracic surgery backup. 2

Temporary Pacing Bridge for Pacemaker-Dependent Patients

Because pacemaker-dependent patients cannot be discharged with temporary pacing systems, active-fixation leads attached to external pacing generators serve as the bridge to permanent device re-implantation. 1

• Active-fixation leads connected to external devices permit earlier patient mobilization and reduce pacing-related adverse events (lead dislocation, severe bradycardia, local infection) compared to passive-fixation temporary leads. 1
• This bridging strategy allows patients to remain ambulatory while awaiting appropriate timing for permanent device re-implantation. 1
• The temporary system remains in place until blood cultures clear and the infection-free interval is achieved. 1

Common pitfall: Do not attempt to discharge pacemaker-dependent patients with conventional temporary transvenous pacing systems—these carry high complication rates and are not suitable for outpatient management. 1

Antimicrobial Therapy

Empiric vancomycin should be initiated immediately to cover both oxacillin-susceptible and oxacillin-resistant staphylococci, which cause the majority of cardiac device infections. 2

• Switch to cefazolin or nafcillin once susceptibilities confirm oxacillin-susceptible Staphylococcus species. 2
• Continue vancomycin for oxacillin-resistant organisms or when β-lactam antibiotics are contraindicated. 2
• Antimicrobial choice must be based on identification and in vitro susceptibility results of the infecting pathogen. 1

Duration of Antimicrobial Therapy

The duration depends on infection complexity and must be counted from the day of device extraction:

• Minimum 14 days after device removal for bloodstream infection without complications. 1
• 4 to 6 weeks for complicated infections including endocarditis, septic thrombophlebitis, osteomyelitis, or persistent bacteremia despite device removal. 1, 2
• If blood cultures remain positive ≥24 hours after extraction, a minimum of 4 weeks of intravenous therapy is required even when echocardiography shows no vegetations. 2

Timing of Re-Implantation

Blood cultures must be negative before any new device is implanted. 1, 2

Specific Timing Based on Infection Type:

• For isolated device infection without valvular involvement: Re-implantation is permissible after ≥72 hours of consecutive negative blood cultures following extraction. 1, 2
• When valvular infection (endocarditis) is present: Re-implantation must be delayed for at least 14 days after the first negative blood culture. 1, 2
• For pocket infection without bacteremia: The same ≥72 hour culture-negative interval applies. 2

The optimal timing remains somewhat uncertain as no prospective trials have examined this question, but the median time to re-implantation in observational data was 13 days for bacteremic patients versus 7 days for non-bacteremic patients. 1

Re-Implantation Site Selection

The replacement device must not be placed ipsilateral to the extraction site; contralateral implantation is strongly preferred to reduce relapse risk. 1, 2

• Alternative implantation sites include the iliac vein or an epicardial system. 1, 2
• If contralateral placement is not possible, a transvenous lead can be tunneled to a device placed subcutaneously in the abdomen. 1
• Epicardial systems are especially considered when a new device is needed after valve surgery. 2

Common pitfall: Do not re-implant on the same side as the extracted system—this markedly increases the risk of recurrent infection. 2

Emerging Evidence: Leadless Pacemaker as Replacement Option

Recent observational data suggest that leadless pacemakers may be particularly advantageous as replacement devices after infected conventional system extraction, including in pacemaker-dependent patients. 4, 5, 6, 7, 8

• Leadless pacemakers eliminate the surgical pocket and transvenous leads, theoretically reducing reinfection risk. 4, 5, 7, 8
• Multiple case series report zero reinfections during follow-up periods ranging from 12 weeks to over 2.5 years after leadless pacemaker implantation following infected device extraction. 4, 5, 6, 7, 8
• Some centers have successfully implanted leadless pacemakers before, simultaneously with, or shortly after extraction of infected conventional systems, even in the presence of active infection or positive blood cultures. 5, 6, 7
• This strategy may be particularly useful for pacemaker-dependent patients or those with recurrent device infections. 4, 6, 8

Important caveat: While these observational data are promising, they represent relatively small case series without randomized controlled trials. The established guideline recommendations for timing and culture clearance should still guide practice until larger prospective studies confirm the safety of earlier leadless pacemaker implantation. 4, 7, 8

Diagnostic Evaluation

Obtain at least 2 sets of blood cultures at initial evaluation before initiating antimicrobial therapy. 1

• Generator-pocket tissue Gram stain and culture, plus lead-tip culture, should be obtained when the device is explanted. 1
• Transesophageal echocardiography (TEE) is essential for patients with suspected device infection who have positive blood cultures or negative cultures after recent antimicrobial therapy, offering >90% sensitivity for detecting lead vegetations. 1, 2
• Transthoracic echocardiography detects only ~30% of lead vegetations and is inadequate for ruling out infection. 2
• Blood cultures must be repeated after device removal to guide re-implantation timing. 1, 2

Common pitfall: Do not rely on transthoracic echocardiography alone—its low sensitivity can miss >70% of cases. 2

Reassessment of Pacing Need

Each patient must be carefully evaluated to determine whether there is a continued need for a new device. 1

• One-third to one-half of patients in some series do not require new device placement due to reversal of pathological processes, changing clinical circumstances, or lack of appropriate initial indication. 1
• This assessment should occur before extraction is attempted, particularly in patients with complete heart block or resynchronization therapy devices. 1

Key Pitfalls to Avoid

• Do not rely on antibiotics alone without device removal—cure rates are low and relapse is common. 2
• Do not postpone extraction while awaiting antimicrobial therapy—removal should be performed promptly. 3, 2
• Do not discharge pacemaker-dependent patients with conventional temporary pacing systems—use active-fixation leads connected to external generators as a bridge. 1
• Do not re-implant before blood cultures clear—wait at least 72 hours (or 14 days for valvular infection) after negative cultures. 1, 2