I have had my PICC line in since 2/25/09. Infusion nurse came last night and could not draw blood from my line. Infusing is not a problem - she flushed me out several times and my meds went in fine but she still could not get blood out. She explained why and said it is common (can't remember the name for it), and that next week she will come by and put in Cathflo, wait an hour, flush it and I should be fine. BUT, I looked it up and it has some potential serious side effects. But of course they list side effects even if it only happened to one person, so I just want to know if anyone has used this before and how it went and most importantly, if it worked.