It was reported that during use of the device for cardiopulmonary bypass (cpb), the blood parameter monitor (bpm) potassium (k+) value deviated from the test value.As a result, an alternate device was employed.The surgical procedure was completed successfully.There was no delay, no blood loss, nor adverse consequences to the patient.Per clinical review: the end user reported that the bpm displayed a large k+ value drift during cpb.The end user reported that the k+ value deviated from the measured lab blood gas value.The shunt sensor in question was measuring an arterial k+ value.The k+ value was either drifting from the lab measured value or was reading 9.99 on the monitor screen.The end user decided to switch to the venous shunt sensor and the k+ value read accurately.This occurred during cpb, but did not delay the case, no blood loss recorded, and the surgery was completed successfully.
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