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Patient selection and outcomes using a low-dose intrathecal opioid trialing method for chronic nonmalignant pain Grider JS; Harned ME; Etscheidt MAPain Physician 2011[Jul]; 14 (4): 343-51BACKGROUND: Various methods exist for trialing patients for intrathecal drug delivery. Currently no standards exist regarding "best practices" for trialing techniques. OBJECTIVES: The specific aim of the current study is to report results of patients trialed using a low-dose intrathecal morphine technique in the treatment of chronic noncancer pain. SETTING: academic pain medicine practice STUDY DESIGN: Retrospective Review METHOD: Visual analog pain scores (VAS) were obtained at the initial visit, after a 6 week opioid-free interval prior to trial, at intrathecal doses of 25, 50, 100, 200 and 400 mug of intrathecal morphine during the trial, at one month post-implant, and current VAS. Additionally, intrathecal opioid doses at implant and current state are reported. RESULTS: VAS scores at the initial visit and after 6 weeks of opioid cessation were identical. There was a significant improvement in VAS after the trial, which was sustained over the course of therapy. Additionally, the use of the protocol described in this article suggests that the dose-response relationship following opioid cessation is in the 50-400 mug/d range for intrathecal morphine and that tolerance may be reversed during the 6 week opioid-free period. LIMITATIONS: Small trialing study CONCLUSIONS: Opioid taper and a 6 week opioid-free period may 1) improve long-term analgesia versus a combination of oral/ intrathecal drug delivery system therapy 2) it may be possible to maintain analgesia at microgram doses and 3) opioid tolerance may be reversible in 6 weeks. Further it appears that a dose response relationship for effective analgesia may be less than 400 mug of intrathecal morphine.|*Clinical Trials as Topic[MESH]|*Infusion Pumps, Implantable[MESH]|*Patient Selection[MESH]|Analgesics, Opioid/*administration & dosage/therapeutic use[MESH]|Chronic Pain/*drug therapy[MESH]|Humans[MESH]|Injections, Spinal[MESH]|Morphine/administration & dosage/therapeutic use[MESH]|Pain Measurement[MESH]|Retrospective Studies[MESH]|Treatment Outcome[MESH] |
