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Cardiac Pacing for Bradycardia Support: Evidence-based Approach to Pacemaker Selection and Programming
Israel Galtes1, Gervasio A. Lamas
1Mount Sinai Medical Center, Butler Building, 4300 Alton Road, Miami Beach, FL 33140, USA. most95@aol.com
Current Treatment Options in Cardiovascular Medicine
|August 25, 2004
Summary
Dual-chamber pacemakers offer benefits like reduced atrial fibrillation but haven't consistently improved mortality or quality of life compared to simpler devices. Further research is needed for optimal pacemaker use.
Area of Science:
- Cardiology
- Biomedical Engineering
- Clinical Electrophysiology
Background:
- Dual-chamber pacemakers are widely used for symptomatic bradycardia, featuring advanced functions like rate responsiveness.
- Physiologic studies support atrioventricular synchrony, but clinical trial outcomes have not met expectations.
Purpose of the Study:
- To evaluate the clinical effectiveness of dual-chamber pacemakers compared to single-chamber pacing.
- To assess the impact of advanced pacemaker features on patient outcomes and quality of life.
Main Methods:
- Review of recent randomized clinical trials comparing dual-chamber versus single-chamber ventricular pacing.
- Analysis of data on mortality, stroke, heart failure hospitalizations, quality of life, and atrial fibrillation incidence.
Main Results:
- Dual-chamber pacing did not prevent mortality or stroke and showed limited reduction in heart failure hospitalizations compared to ventricular pacing.
- A reduction in newly diagnosed atrial fibrillation was observed, and pacemaker syndrome incidence decreased.
- Rate modulation did not consistently improve quality of life or exercise capacity.
Conclusions:
- While dual-chamber pacing may reduce atrial fibrillation and pacemaker syndrome, its benefits over simpler pacing modes are less pronounced than expected from hemodynamic data.
- The use of pacemakers for vasovagal syncope remains controversial, and programming of dual-chamber defibrillators requires careful consideration to avoid adverse effects.