It was reported that a usg piv was placed on a critical patient and after hooking up tubing and attempting to flush i was not able to, attempted to draw back and was not able to.Patient had complicated veins so i assumed it was malposition or something was wrong with the placement.Removed the piv and made another attempt and "walked" the catheter in to the hub, connected tubing again and same situation except prior to attaching tubing i pulled labs directly from the iv catheter this time so knew it was a good placement.I attached a newly connected flush and tubing to the piv and this time it was able to pull back and flush with ease.
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