I disconnected the patient's iv fluids (nahco3 in d5w) from the microclave cap on the red lumen of his picc line.These fluids had been running continuously for about 4 days, probably connected the whole time.I screwed a flush onto the cap with no problem, tested for blood return, and flushed the lumen.When i went to reattach fluids with new tubing, i noticed that the tip of the cap had cracked and half of the plastic around the tip was missing.I couldn't find any of the pieces at bedside.There was no evidence that any fluids had leaked during infusion.Flush and blood return check had been completed the previous night (through tubing port) without incident or leakage.I told the charge rn and performed a sterile cap change to replace the broken cap.When i tried to flush through the new cap, the line was completely occluded -- would not return or flush.The charge rn and i were concerned that a piece of plastic might have somehow lodged in the lumen.The dr.Arrived on the floor not long afterward, so we discussed the situation with him and showed him the defective cap.He considered sending the patient down for line check, but we all agreed it was possible some residual blood had been left in the lumen and clotted during the cap change.He recommended trying to tpa the line.I instilled tpa and the occlusion resolved when i removed tpa 50 minutes later.This completely resolved the situation, with no evidence of harm to or impact on the patient.I saved the broken cap in a biohazard back for director follow-up.
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