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Optimal atrioventricular delay in physiological pacing determined by Doppler echocardiography
Pacing and Clinical Electrophysiology : PACE
|January 1, 1986
Summary
Optimizing atrioventricular (AV) delay in VDD mode pacemakers significantly impacts stroke volume. The ideal AV delay varies per patient, especially those with left ventricular strain.
Area of Science:
- Cardiology
- Biomedical Engineering
- Medical Devices
Background:
- Physiological pacemakers offer advanced pacing modes like VDD.
- Atrioventricular (AV) delay optimization is crucial for cardiac output.
- Doppler echocardiography is a non-invasive tool for assessing hemodynamic parameters.
Purpose of the Study:
- To investigate the impact of varying AV delays in VDD mode pacemakers on stroke volume.
- To determine if optimal AV delay is patient-specific.
- To compare the effect of AV delay on stroke volume in patients with and without left ventricular strain.
Main Methods:
- Eight patients with VDD pacemakers were studied.
- Blood velocity in the aortic root was measured using Doppler echocardiography.
- Pacemakers were programmed through VVI to VDD modes with varying AV delays at constant heart rates.
Main Results:
- Stroke volumes demonstrated significant dependence on AV delay adjustments.
- Optimal AV delay varied considerably among individual patients.
- The influence of AV delay on stroke volume was more pronounced in patients with left ventricular strain due to aortic valve disease.
Conclusions:
- Patient-specific AV delay optimization is essential for maximizing stroke volume in VDD pacing.
- Left ventricular strain may necessitate more precise AV delay programming.
- These findings highlight the importance of individualized pacemaker programming for hemodynamic efficiency.