Patient has had an iv pump at his bedside for which the rn hung ivpg of zosyn, connecting the secondary tubing to the primary tubing.She set the pump in a manner to allow for the zosyn to infuse.However, the medication did not infuse.The clamp on the tubing was open.Rn changed the secondary iv tubing to a new set of the same kind and the same problem occurred; the medication did not infuse.A video clip of biomed testing verified that the primary bag would back feeds into the secondary line/bag, possible issue with backflow valve.
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