"Opioid creep" is real and may be the cause of "fluid creep".
Sullivan SR, Friedrich JB, Engrav LH, Round KA, Heimbach DM, Heckbert SR, Carrougher GJ, Lezotte DC, Wiechman SA, Honari S, Klein MB, Gibran NS.
Sullivan SR, et al. Among authors: wiechman sa.
Burns. 2004 Sep;30(6):583-90. doi: 10.1016/j.burns.2004.03.002.
Burns. 2004.
PMID: 15302427