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Effect of atrioventricular synchronous pacing on cardiac output determined by CO2 rebreathing at constant submaximal
H Douard1, C Blaquiere-Roche, V Tourtoulou
1Hôpital Cardiologique, Pessac, France.
The American Journal of Cardiology
|July 15, 1995
Insights
This study found no hemodynamic advantage for atrioventricular (AV) synchronous pacing compared to fixed-rate pacing during exercise. Both DDD and VVI pacing methods showed similar cardiac output and heart rate responses.
Area of Science:
- Cardiology
- Biomedical Engineering
- Exercise Physiology
Background:
- Pacemaker technology aims to optimize cardiac function.
- Atrioventricular (AV) synchronous pacing (DDD) seeks to mimic natural heart rhythm.
- VVI pacing provides fixed-rate ventricular stimulation.
Purpose of the Study:
- To compare cardiac output and heart rate response between DDD and VVI pacing during submaximal exercise.
- To determine if AV synchronous pacing offers hemodynamic superiority over VVI pacing.
Main Methods:
- Noninvasive CO2 rebreathing method used to assess cardiac output.
- Patients underwent identical submaximal exercise protocols.
- Heart rate response was monitored during both pacing modes.
Main Results:
- No significant difference in cardiac output was observed between DDD and VVI pacing.
- Heart rate responses were comparable across both pacing groups.
- Hemodynamic performance did not favor AV synchronous pacing.
Conclusions:
- DDD pacing does not demonstrate a hemodynamic advantage over VVI pacing during submaximal exercise.
- Current pacemaker algorithms may not fully leverage the benefits of AV synchrony in this context.
- Further research is needed to explore optimal pacing strategies.
Abstract:
This study compared cardiac output assessed by a noninvasive CO2 rebreathing method at identical submaximal exercise and heart rate response in patients undergoing DDD or VVI pacing. Our results did not show any hemodynamic superiority of AV synchronous pacing.