Well, it all depends on how much has been pulled out. If the entire thing is "out", You must measure it to see if it was the same length as what was placed, or in the case of a Groshong, look for the black tip, as it being there on its distal end tells you that it all came out.
If you were present when it came out, pressure should be applied to the site until hemostasis resumes. Now, if you aren't privy to what went in ( CM or Inches placed) then you will have to assess for "No jagged edges at catheter's tip to the naked eye" and your report to the MD, as he'll ask about the pt, and determine whether to send him or her for a CXR.
Catheter embolism s/s are varied. Some people show NO symptoms, others could experience hypotension, SOB, Chest pain.
If it has embolized, the MD will have to retieve it with a specially designed snare, going up through the groin in most cases, like a cardiac cath.
If only a portion was yanked out, one must determine the length of therapy and osmolarity/pH if the medication given to ascertain whether the line can be made a MIDLINE and continue therapy, or should the entire IV catheter be pulled and replaced?
Remember that NO IV catheter should stop, or terminate in any other vessel, besides the SVC if it is centrally placed. However, as mentioned, if the drug is a benign drug, and can go peripherally, the catheter could be pulled back till the tip is right before the Axillary vein, thus making it a Midline.