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The left atrial appendage is a sac attached to the left upper chamber of the heart where blood clots and strokes originate from in patients with atrial fibrillation. The LARIAT procedure is a minimally invasive procedure to close the left atrial appendage to decrease the risk of stroke. 1. A magnetic wire is inserted into the heart through the groin vein, and matched to another wire from the outside of the heart, inserted from a needle stick into the chest wall. 2. The LARIAT suture is advanced across the magnetic wire connection, to the base of the left atrial appendage. 3. The suture is tied down, closing the left atrial appendage. 4. Over time, the left atrial appendage dissolves