Abstract 11570: Left Atrial Appendage Morphology Determined by Computed Tomography Can Predict High Risk Patient for Embolism with Atrial Fibrillation
Background: Left atrial appendage (LAA) is the main source of left atrial thrombus that causes systemic embolism including stroke in patients with atrial fibrillation (AF). LAA flow velocity that can be evaluated by transesophageal echocardiography (TEE) is one of promising factors to predict LAA thrombus, but TEE is semiinvasive. Recently, 64-multislice cardiac CT (CCT) can evaluate detailed LAA morphology, but the correlation between LAA velocity and LAA morphology is unknown. Thereby, the aim of this study was to investigate which of LAA morphologic parameters determined by CCT correlates with LAA velocity in patients with AF.
Methods: In 43 patients with AF (paroxysmal and persistent AF), both TEE and CCT were performed within a week. We measured LAA velocity by TEE and divided our patients into the two groups according to the LAA velocity: low LAAV group whose LAA velocity≤30cm/sec and high LAAV group whose LAA velocity >30cm/sec. We compared the various CCT parameters including left atrial volume, LAA volume, number of lobes, area of LAA ostium and LAA morphologic type that was classified into the following two types: chicken wing type which showed LAA with sharp bend and non-chicken wing type which showed LAA without sharp bend between the two groups.
Results: As shown in a table, the incidence of chicken wing type in high LAAV group was significantly higher than that in low LAAV group while there were no significant differences of the other parameters between the two types.
Conclusions: The morphology of LAA determined by CCT, chicken wing or non-chicken wing type, can become a new marker to predict high risk patients for embolism with AF.
- © 2011 by American Heart Association, Inc.