A multicenter evaluation of a single-pass lead VDD pacing system. The Multicenter Study Group

Area of Science:

• Cardiology
• Biomedical Engineering
• Electrophysiology

Background:

• Symptomatic atrioventricular (AV) conduction disturbances require pacing solutions.
• VDD pacing systems offer a potential solution by utilizing atrial activity to trigger ventricular pacing.
• Ensuring reliable atrial sensing and tracking is crucial for VDD system efficacy.

Purpose of the Study:

• To evaluate the atrial tracking capability and synchronization performance of a single-pass lead VDD pacing system.
• To assess the system's reliability in patients with AV conduction disturbances and a competent sinus node.
• To determine the percentage of atrial synchronization under various physiological and stress conditions.

Main Methods:

• A single-pass lead VDD pacing system was implanted in 237 patients across 30 centers.
• Atrial activity was detected using two electrodes on the ventricular lead within the right atrial cavity.
• Atrial synchronization was assessed through clinical evaluation, ECG, Holter monitoring, and stress tests (exercise, mental, isometric, nifedipine).

Main Results:

• The VDD pacing system demonstrated high atrial synchronization, with over 98% of ventricular paced complexes being atrial triggered.
• This high synchronization rate was consistently observed in at least 95% of patients.
• Mean follow-up was 385 days, indicating sustained system performance.

Conclusions:

• The single-pass lead VDD pacing system provides reliable atrial synchronization in patients with AV conduction disturbances.
• The system effectively utilizes atrial activity to optimize ventricular pacing, even under stress.
• This technology represents a viable pacing strategy for selected cardiac conditions.