The customer reported that on the ortho unit, the patient had magnesium ordered, and the nurse noted it was running at a bolus rate, which was confirmed by another rn.The infusion was then switched to another pump module, but still ran at bolus rate.It appeared that approximately half the bag had infused, but the patient was asymptomatic.A magnesium level was redrawn.The customer reported there was no detectable harm.The customer also reported the tubing was sent out for testing and it was indicated there was failure of the back check valve which caused the appearance of free flow as the medication went into the carrier (primary) fluid.
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