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Effects of Bupivacaine on Opioid Patient-Controlled Intrathecal Analgesia in Chronic Pain Patients Implanted with Drug Delivery Systems.

Authors
  • Hayek, Salim M1, 2
  • McEwan, Matthew T1, 2
  • Veizi, Elias2, 3
  • DeLozier, Sarah J4
  • Pogrebetskaya, Mariya2
  • 1 Division of Pain Medicine, Case Western Reserve University, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA.
  • 2 Department of Anesthesiology, Case Western Reserve University, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA.
  • 3 Pain Service, Louis Stokes Cleveland VA Medical Center, Cleveland, Ohio, USA.
  • 4 Clinical Research Center, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA.
Type
Published Article
Journal
Pain medicine (Malden, Mass.)
Publication Date
Feb 04, 2021
Volume
22
Issue
1
Pages
22–33
Identifiers
DOI: 10.1093/pm/pnaa076
PMID: 32289829
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Combining neuraxial opioids and local anesthetics in acute pain results in improved duration of analgesia and reduced dosages and adverse effects. Although commonly used in intrathecal drug delivery systems (IDDS) for chronic pain, the effectiveness of this admixture has not been examined specifically in relation to patient-controlled intrathecal analgesia (PCIA). IDDS-implanted chronic noncancer pain patients receiving opioids with bupivacaine (O + B) were randomized to receive either opioids without bupivacaine (O) or O + B in a double-blind manner, at IDDS refills, for one week and then crossed over to the other solution for another week. Primary outcome measures included numeric rating scale (NRS) pain scores before and within 30 minutes after PCIA boluses. Secondary outcome measures included average NRS scores and functional outcome measures. Seventeen patients were enrolled, and 16 patients completed the study. There were no differences in NRS scores before and after PCIA boluses between the O and O + B conditions, though pain scores improved significantly (average decrease in NRS scores: O 1.81 ± 1.47 vs O + B 1.87 ± 1.40, P = 0.688). No differences were noted in speed of onset or duration of analgesia. Although more patients subjectively preferred the O + B treatment, the difference was not statistically significant. No differences were noted in secondary outcome measures, with the exception of global impression of change having higher scores in O compared with O + B. Acutely removing bupivacaine from a chronic intrathecal infusion of opioids and bupivacaine in patients with chronic noncancer pain did not adversely affect PCIA effectiveness, nor did it affect speed of onset or duration of effect. These findings are divergent from those in acute pain and may have to do with study conditions and pain phenotypes. © The Author(s) 2020. Published by Oxford University Press on behalf of the American Academy of Pain Medicine. All rights reserved. For permissions, please e-mail: [email protected]

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