This symptom and others, including the observance of swelling or bleeding at the exit site, indicate the patient should seek medical attention as soon as possible.
Tunnelled catheter access involves a longer catheter, which is tunnelled under the skin from the point of insertion in the vein to an exit site some distance away.
Tunneled catheters are passed under the skin from the insertion site to a separate exit site, where the catheter and its attachments emerge from underneath the skin.
