A randomized study on the effects of pacemaker programming to a lower output on projected pulse generator longevity.

Area of Science:

• Cardiology
• Biomedical Engineering
• Medical Devices

Background:

• Cardiac pacemakers require regular physician adjustments to optimize pacing pulse and ensure a safety margin.
• Reducing pacemaker output is a strategy to extend device longevity.
• Individual pacing thresholds vary, necessitating personalized programming.

Purpose of the Study:

• To compare the effects of nominal versus lower pacemaker output on projected device longevity in single and dual-chamber pacemakers.
• To assess the feasibility of programming pacemakers to 2.5 V/0.4 ms with a 100% safety margin.
• To evaluate the impact of reduced output on pacemaker longevity.

Main Methods:

• Prospective, randomized trial involving VVI and DDD pacemakers with steroid-eluting leads.
• Patients randomized at 3-month follow-up based on ventricular pacing thresholds at 2.5 V.
• Pacemaker longevity and lead function assessed via telemetry at 6 and 12 months.

Main Results:

• Programming to 2.5 V/0.4 ms resulted in a 5% insignificant increase in projected longevity for VVI pacemakers (117.9 to 123.7 months, P=0.16).
• For DDD pacemakers, 2.5 V/0.4 ms significantly prolonged longevity by 14% (98.1 to 112.0 months, P<0.0001).
• A ≥100% safety margin was achieved in 99% of patients with the 2.5-V/0.4-ms setting.

Conclusions:

• Programming pacemakers to a lower output (2.5 V/0.4 ms) slightly increases projected device longevity.
• This strategy is effective and safe, particularly for dual-chamber pacemakers, maintaining adequate safety margins.
• Optimizing pacemaker output programming can enhance device longevity and patient management.