I think they gave me heparin in my IV -- or maybe that was with PEX -- can't remember -- I do remember it gave me a nasty taste in my mouth. Isn't somebody (a nurse) sitting with you during the infusion?

I was watched constantly -- with bp taken every 15 minutes. My machine had the bubble problem, too -- the nurse was on a rolling stool -- there were three of us -- she thumped our IVs quite a bit.