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Voltage map of the left atrium showing positioning of the HD Grid (Abbott Technologies, Minneapolis, MN) at the lower coumadin ridge between the left atrial appendage (LAA) and the left superior pulmonary vein (LSPV) and left inferior pulmonary vein (LIPV). Electrograms selected from the catheter show that signals propagate from the LAA to the pulmonary veins, demonstrating that the signals recorded originate from the LAA.
