Early follow-up of lead performance in atrioventricular sequential systems

Area of Science:

• Cardiology
• Biomedical Engineering
• Medical Devices

Background:

• Advancements in pacemaker technology necessitate evaluation of new pacing systems.
• Atrioventricular (A-V) sequential pacing is crucial for managing bradyarrhythmias like sinus node dysfunction and A-V block.

Purpose of the Study:

• To assess the initial performance and short-term follow-up of A-V sequential pacing systems.
• To determine the complication rates and lead stability of these new systems.

Main Methods:

• A cohort of 50 consecutive patients received A-V sequential pacing systems.
• Subclavian vein lead insertion with J-tined atrial and tined ventricular leads.
• Implantation of Medtronic 5992 or Intermedics 259-01 generators.
• Follow-up included monthly telephone transmissions and stability checks over 409 patient-months.

Main Results:

• Median implantation time was 105 minutes.
• Low complication rate requiring reoperation (4 events in 409 patient-months): lead retraction, phrenic nerve stimulation, pseudofracture, and atrial lead cross-talk.
• Confirmed atrial capture in 35 patients and ventricular capture in all patients.
• Demonstrated good stability of lead positions post-implantation.

Conclusions:

• A-V sequential pacing systems demonstrate a low incidence of short-term complications.
• These systems offer reliable atrial and ventricular capture with stable lead positioning.
• Further long-term studies are warranted to confirm sustained efficacy and safety.