I just changed a PICC dressing on a gentleman with a double lumen groshong. The clear part of the red lumen is discolored-a clear brown. I asked him if he had put anything illicit through it, and he said no. I don't see a hx of drug abuse, but can't rule it out. He has been at home getting IV abx. What would cause this discoloration? The white lumen is not affected.
Thanks in advance.