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. 2017 Jun 30;4(2):e000627. doi: 10.1136/openhrt-2017-000627

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© Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2017. All rights reserved. No commercial use is permitted unless otherwise expressly granted.

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Device-specific CT-based LAA occluder size selection. Preprocedural cross-sectional CT assessment of the LAA landing zone. Since the cross section of the LAA landing zone is more often an ellipse, the major axis (maximal diameter) and minor axis (minimal diameter) may differ. As the device comes first into contact with the short axis of the LAA during deployment, there will be a compressive force onto the device. Depending on the design of the closure device, the device will expand or not in a perpendicular plane to the short axis in case of a ‘closed distal end’ or ‘open distal end’ LAA closure device, respectively. LAA, left atrial appendage.