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Figure 1: Watchman device implantation - Intraoperative images. (a) Left-sided thoracoscopic view of the left atrial appendage (LAA) before implantation. PV = Pulmonary vein. (b) Left-sided thoracoscopic view of the LAA after implantation, showing that implantation of the device does not lead to significant morphological changes of the LAA. (c) Per-procedural echocardiographic view after implantation. (d) Per-procedural thoracic radiographic image after implantation. His = His Bundle catheter, CS = Coronary Sinus catheter.