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[Effect of programming different AV intervals on mitral insufficiency in patients with DDD pacemaker].
1Serviço de Cardiologia dos Hospitais da Universidade de Coimbra. marcogege@yahoo.com
Summary
Shortening the atrioventricular interval (AVI) in patients with pacemakers can reduce mitral insufficiency (MI). An AVI of 100 ms improved cardiac output in some patients with severe MI.
Area of Science:
- Cardiology
- Biomedical Engineering
Background:
- Permanent pacemakers are crucial for managing complete atrioventricular block.
- Mitral insufficiency (MI) can be a complication in patients with pacemakers.
- Atrioventricular interval (AVI) programming is a key parameter in pacemaker function.
Purpose of the Study:
- To investigate the impact of programming three distinct atrioventricular intervals (AVI) on mitral insufficiency (MI).
- To assess the effect of AVI on cardiac output (CO) in patients with pacemakers and MI.
Main Methods:
- Nine patients with permanent DDD pacemakers and isolated MI were included.
- Echocardiography was used to quantitatively evaluate MI and CO.
- Three AVI settings (100, 150, and 200 ms) were tested.
Main Results:
- A reduction in MI severity was observed as AVI decreased, with optimal results at 100 ms.
- Cardiac output increased in four patients with greater MI severity when using a 100 ms AVI.
Conclusions:
- A correlation exists between longer AVIs and increased MI severity.
- Shortening the AVI may improve CO in patients with significant MI, potentially by reducing regurgitant volume.