When blood is not pumped properly out of the heart, it may pool in the left atrial appendage and form a clot. If you are at risk for stroke and need to take oral anticoagulants but are either unable or unwilling (because of the associated high risks), LAAC is an implant designed to keep harmful blood clots from entering the bloodstream by occluding the LAA. Be sure that you thoroughly understand the risks and benefits associated.