Dose-response and postoperative confusion following methylene blue infusion during parathyroidectomy.

CAN J ANESTH 54: 1 www.cja-jca.org January, 2007 by some authors that the tip of the cannula should be withdrawn outside the lumen of the vein and sited subcutaneously to avoid the rare complication of air embolism.4 It has also been suggested that this method will protect the catheter from kinking. The circumstances of this case challenge that assumption, and suggest that it may be preferable to leave the cannula inside the vein during catheter insertion. Knotting of a PICC is a potential complication which one must consider whenever there is difficulty in advancing the catheter, or when there is difficulty in removing the stylet. When this complication is suspected, the course of the catheter should be confirmed radiologically, and the catheter removed surgically, as excessive traction on the catheter could lead to further complications.