Direct Comparison of Cardiac CT With TEE to Evaluate Watchman FLX LAA Occluder Device Characteristics

TEE will be performed using a 3D probe. TEE images will be acquired at the standard 0, 45, 90, and 135 degree views along with a 3D acquisition encompassing the entire LAA, device, left pulmonary vein and lateral mitral annular landmarks.

Cardiac CTA will be performed with ECG gating using systems with ≥ 64 detector rows and with temporal resolution that is at least 175 msec (rotation speed ≤ 350 msec for single source systems). Cardiac CTA images will be acquired for the entire cardiac cycle without ECG phase specific pulsing and with contrast appropriately timed for peak left atrial/arterial phase contrast enhancement. In addition, a targeted end systolic only delayed phase image set (45 seconds after the arterial phase scan and limited to the left atrium and appendage device) will be acquired.