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Left atrial appendage function during DDD and VVI pacing
E N Simantirakis1, F I Parthenakis, S I Chrysostomakis
1Cardiology Department, University Hospital of Heraklion, Crete, Greece.
Heart (British Cardiac Society)
|May 1, 1997
Summary
Dual-chamber (DDD) pacing significantly improves left atrial appendage function compared to single-chamber (VVI) pacing. This enhanced function with DDD pacing may reduce the risk of thromboembolic events in patients with pacemakers.
Area of Science:
- Cardiology
- Biomedical Engineering
- Medical Devices
Background:
- Dual-chamber pacing systems are widely used for cardiac rhythm management.
- Left atrial appendage (LAA) function is crucial for preventing thromboembolic events.
- Understanding pacing mode effects on LAA function is essential for optimizing patient outcomes.
Purpose of the Study:
- To investigate the impact of VVI and DDD pacing modes on left atrial appendage function.
- To compare LAA flow dynamics between VVI and DDD pacing using transesophageal echocardiography.
Main Methods:
- A randomized controlled trial involving 22 patients with dual-chamber pacemakers.
- Transesophageal echocardiography was used to assess LAA emptying and filling flow velocities.
- Patients were evaluated under both VVI and DDD pacing modes after a minimum of two months in each.
Main Results:
- Patients exhibited significantly higher LAA emptying and filling flow velocities under DDD pacing compared to VVI pacing.
- The filling and emptying flow velocity integrals were also significantly greater in DDD mode.
- These findings were consistent across all 22 participants.
Conclusions:
- DDD pacing demonstrates superior left atrial appendage function compared to VVI pacing.
- The improved LAA function with DDD pacing may contribute to a lower risk of thromboembolic episodes.
- Transesophageal echocardiography is a valuable tool for assessing LAA function in pacemaker patients.