Device implantation operations
The LAAC device was implanted via a septal approach using a catheter-based delivery system. Briefly, the operations were conducted under general anesthesia and tracheal intubation. After the TEE-guided atrial septum puncture, LAA angiography of the right anterior oblique (RAO)at 30° plus caudal (CAU)at 20° was performed for LAA measurements. LAAC devices with suitable diameters were delivered through a catheter-based delivery system and expanded to close the LAA openings. During the procedures, TEE was performed to confirm the LAA closure. Compression ratio of LAAC devices was calculated immediately after the procedures.