Evolution of an active fixation atrial pacing lead

Area of Science:

• Cardiology
• Biomedical Engineering
• Medical Device Technology

Background:

• Atrial pacing leads are crucial for cardiac rhythm management.
• Electrode design significantly influences pacing lead performance and longevity.
• Optimizing lead parameters is essential for efficient pacemaker function.

Purpose of the Study:

• To compare the pacing performance of three bipolar atrial pacing leads with varying electrode designs.
• To evaluate the impact of reduced tip surface area and steroid elution on lead parameters.
• To assess long-term pacing thresholds and system current drain.

Main Methods:

• Three atrial pacing lead models (S84F, S44F, BS45D) with distinct electrode designs were implanted in 30 patients (10 per group).
• Pacing thresholds, lead impedance, and atrial potentials were measured during implantation and at one year post-procedure.
• Pacemaker telemetry was used to measure chronic output settings and battery current drain.

Main Results:

• The BS45D lead, featuring steroid elution, demonstrated significantly lower early postoperative and long-term pacing thresholds compared to S84F and S44F.
• Reducing tip surface area (S44F) did not improve pacing performance.
• No significant differences were observed in lead impedance, atrial sensing, or battery current drain among the lead models at one year.

Conclusions:

• Steroid elution in atrial pacing leads effectively reduces pacing thresholds, potentially improving acute and chronic performance.
• Electrode surface area reduction alone does not enhance pacing lead efficacy.
• While steroid elution lowers pacing thresholds, it does not translate to reduced current drain in the pacing system.