I was going to guess that, before I saw your other link.
Anesthesia et al. are implicated because they oversee epidurals.
I know where I work, they are VERY anal about if and when patients receive Lovenox, etc, in relation to the placement and removal of epidural catheters. An anesthesiologist told me the other day that Lovenox is much more dangerous that straight up subq heparin in these situations, but I do not remember why?