Hi ... I work in a small PACU in Ontrio Canada - we do general / gyne/ ent / plastics / ortho .... so far just our major gyne patients are pre warmed ... we just started this about a month ago ... our patients were coming out of the OR (despite wrming fluids and forced air warming introp) with a temp @ 36C and lower - so to meet the standard practice we started warming for 45 min pre op @ 43 - 46 C.. it is just new to us as well but will let you know how we make out Julia from Canada