Section a4: during processing of this incident, attempts were made to obtain patient weight.Further information was requested but not received.Section b3: event date is estimated.A patient experienced ineffective left side coverage due to one their leads having high impedance was reported to abbott.As a result, the lead was explanted and replaced.During the lead replacement only part of the anchor had been explanted resulting in a fragment of the lead remaining implanted within the patient.Therapy was restored.The results of the investigation are inconclusive since the device was not returned for analysis.Based on the information received, the cause of the reported incident could not be conclusively determined.
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