Microbial growth on temporary pacemaker leads post-TAVR: pathogen spectrum and clinical implications

Area of Science:

• Cardiology
• Infectious Diseases
• Medical Devices

Background:

• Transcatheter aortic valve replacement (TAVR) is a standard treatment for severe aortic stenosis.
• Temporary pacemakers (TPs) are often used during TAVR due to pacing needs and potential conduction disturbances.
• TP use carries an infection risk, necessitating investigation into microbial growth on leads.

Purpose of the Study:

• To investigate microbial growth on temporary pacemaker leads post-TAVR.
• To determine the association between microbial growth and clinical outcomes after TAVR.
• To identify pathogens and risk factors for microbial growth on TP leads.

Main Methods:

• A prospective study of 247 patients undergoing TAVR with TP leads.
• TP leads were cultured for bacterial growth over 14 days.
• Comparison of outcomes between patients with and without microbial growth, focusing on 30-day mortality, infections, and complications.

Main Results:

• No significant difference in 30-day mortality, infections, hospital stay, or stroke rates between groups with and without microbial growth.
• 74.5% of TP leads showed no bacterial growth; remaining had mostly non-pathogenic bacteria.
• Sheath placement more than 2 days prior to TAVR was significantly associated with higher microbial growth risk (OR: 2.1).

Conclusions:

• Microbial growth on temporary pacemaker leads does not significantly affect clinical outcomes after TAVR.
• The timing of sheath placement is critical; early placement (>2 days pre-TAVR) increases contamination risk.
• Minimizing the duration of sheath indwelling is recommended to reduce infection risk.