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Clinical trials of pacing mode selection
C Y Tang1, C R Kerr, S J Connolly
1Minneapolis Heart Institute, Abbott Northwestern Hospital, Minnesota, USA. chuentang@pol.net
Cardiology Clinics
|March 10, 2000
Summary
Current recommendations for pacing modes lack strong evidence. Large trials suggest physiologic pacing offers minimal benefits, prompting ongoing research for better patient selection and improved cardiac device guidelines.
Area of Science:
- Cardiology
- Biomedical Engineering
- Clinical Trials
Background:
- Current guidelines for pacemaker selection (dual-chamber vs. single-chamber ventricular pacing) in sinus node dysfunction or AV conduction disorders are primarily based on observational data and expert opinion.
- Limited evidence from early randomized trials suggested a survival advantage for physiologic pacing, but only after prolonged follow-up (5.5 years).
Purpose of the Study:
- To evaluate the effectiveness of different pacing modes, specifically comparing physiologic pacing against traditional ventricular pacing.
- To provide robust scientific evidence to inform updated clinical recommendations for pacemaker mode selection.
Main Methods:
- Analysis of preliminary results from a large-scale, multicenter, randomized trial comparing physiologic pacing versus ventricular pacing.
- Ongoing enrollment and follow-up in two additional large-scale multicenter randomized trials.
Main Results:
- Preliminary findings from a major trial indicate a modest reduction in atrial fibrillation with physiologic pacing after 3 years.
- No significant survival advantage was observed with physiologic pacing in the preliminary analysis.
Conclusions:
- Existing recommendations for pacemaker mode selection require re-evaluation based on emerging evidence from large randomized trials.
- Further data from ongoing trials are crucial for establishing evidence-based guidelines for optimal pacing mode selection in cardiac patients.