Review

Intrathecal drug delivery.

Pain Physician. 2008 Mar 1;11(2 Suppl):S89-S104.
Randomized Controlled Trial

Oral naltrexone to enhance analgesia in patients receiving continuous intrathecal morphine for chronic pain: a randomized, double-blind, prospective pilot study.

J Opioid Manag. 2007 May 1;3(3):137-44.
Review

Patient selection and outcomes using a low-dose intrathecal opioid trialing method for chronic nonmalignant pain.

Pain Physician. 2011 Jul 1;14(4):343-51.