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Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation
Published on: February 26, 2013
A morphological study of the left atrial appendage in chinese patients with atrial fibrillation
1Department of Cardiology, Affiliated Nanjing Maternity and Child Health Care Hospital, Nanjing Medical University, Nanjing, Jiangsu Province, China.
Insights
Left atrial appendage (LAA) morphology varies significantly between patients with atrial fibrillation (AF) and atrial septal defects (ASD). Understanding LAA shape is crucial for designing effective occluding devices to prevent stroke in AF patients.
Area of Science:
- Cardiovascular Imaging
- Interventional Cardiology
Background:
- Left atrial appendage (LAA) morphology influences cardioembolic risk in atrial fibrillation (AF).
- Accurate characterization of LAA anatomy is essential for developing effective LAA occluding devices.
- Previous studies have not fully detailed LAA morphology in Chinese populations.
Purpose of the Study:
- To investigate and classify LAA morphology in Chinese patients with AF and congenital atrial septal defects (ASD) using angiography.
- To compare LAA dimensions and emptying fractions between AF and ASD patient groups.
- To provide anatomical data for optimizing LAA occluding device design.
Main Methods:
- Angiographic assessment of LAA morphology in 45 AF patients and 30 ASD patients.
- Measurement of LAA dimensions and calculation of LAA emptying fraction.
- Classification of LAA morphology into eight distinct categories.
Main Results:
- Significant differences in LAA morphology were observed between AF and ASD groups.
- Patients with AF predominantly exhibited tube-shaped, single-lobed LAAs.
- ASD patients most frequently presented with irregular or sphere-like, multi-lobed LAAs; AF patients had larger LAAs with lower emptying fractions.
Conclusions:
- LAA morphology exhibits substantial variability in size, shape, and lobularity.
- Device design for LAA occlusion must consider the diverse anatomical characteristics of the LAA in AF patients.
- Tailoring device design to specific LAA morphologies can improve stroke prevention strategies.
Objective:
Using angiography, this study examined left atrial appendage (LAA) morphology in Chinese patients with atrial fibrillation (AF) or congenital atrial septal defects (ASD), to provide data that might aid the design of new LAA-occluding devices to prevent cardioembolism and stroke in patients with AF.
Methods:
Patients with AF or ASD were enrolled. The LAA was visualized angiographically; its dimensions were measured and the emptying fraction was calculated.
Results:
A total of 45 patients with AF and 30 patients with ASD were included in the study. LAA morphology was classified into eight categories. The majority of patients with AF had tube-shaped LAAs with a single lobe; the most common LAA morphologies in patients with ASD were irregular or sphere-like, with multiple lobes. Patients with AF had significantly larger LAAs with significantly lower emptying fractions compared with LAAs of patients with ASD.
Conclusions:
The LAA demonstrated considerable morpho logical variability in terms of its size, shape and number of lobes. The design of new occluding devices must take into account the size and shape of the LAA in patients with AF.
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