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Cardiac tamponade is a life-threatening complication during left atrial appendage (LAA) closure. We report a 77-year-old woman who underwent a transseptal puncture for LAA closure with the Watchman device that was complicated by tamponade. This was successfully treated with the deployment of a Cardioform 25-mm septal occluder device. (Level of Difficulty Intermediate.).A 45-year-old woman with a partial atrioventricular canal presented with an iatrogenic interventricular shunt after implantation of a mechanical mitral prosthesis. The sh