Lasso catheter set up prior to start of case, magnetic sensor showed error message on mapping system.Cable changed without resolution.Catheter had to be changed out, the new catheter sensed as it should, procedure completed successfully.No apparent visual defects noted.Device failed out of the box.This is the fourth similar event with this type of equipment over a period of approximately 3 months.Product has been returned to the manufacturer.It is unknown what is causing or contributing to these problems.
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