Interventional pain procedures have diagnostic, prognostic and therapeutic value. It is
well-documented that the reference standard for identifying a pain generator is a low-volume
block performed with local anesthetic, with or without steroid. Many factors may increase the
false positive (FP) rate of diagnostic and prognostic nerve blocks; however, the use of
sedation is the most controversial and remediable. Proponents of sedation argue that it has
little effect on the rate of positive diagnostic blocks, and may even reduce the
false-negative rate. The purpose of this study is to determine the effect of intravenous
sedation on pain relief and the "false-positive rate" after diagnostic nerve blocks.