Abstract
The intrathecal drug-delivery system (IDDS) is one mode of infusing analgesic medications directly into the cerebrospinal fluid in close proximity to their site of action. This modality has been employed in patients with refractory pain either due to malignant or non-malignant causes for over 30 years. Unfortunately, and despite the number of years it has been in use, there is still a scarcity of rigorous evidence to guide its integration into clinical practice. Current best evidence is inconclusive as to the comparative effectiveness and harms of the IDDS relative to routine medical care of patients. There are far more systematic reviews than high-quality primary comparative studies of the IDDS vs. conventional pain treatment. Existing clinical practice recommendations are best viewed as expert opinion with competing interests. This article will review the existing literature for indications, contraindications, consensus statements, different technologies, and complications of the IDDS. Although approved analgesics for IDDS delivery are limited to morphine and ziconotide, many other analgesics, alone or in combination, are routinely used in this setting. This review will also focus on the pharmacology, clinical efficacy, and safety of intrathecal medications extensively used in clinical practice; including agents approved, unapproved, and under development.
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Acknowledgments
The Ottawa Hospital Anesthesia Alternate Funds Association provided support to prepare this article. The authors would like to thank the Centre for Practice Changing Research at the Ottawa Hospital Research Institute, Mr. Raymond Daniel, Mr. Danny Jenkins, and Dr. Gregory Bryson for their advice and assistance preparing the article for publication.
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In 2012–13, the University of Ottawa received unrestricted donations from Medtronic Inc., Reckitt Benckiser, and Purdue Pharma to devote to The Ottawa Hospital Pain Clinic’s knowledge translation projects for primary care entitled “PainConnect” and “AddictionConnection”. Dr. Smyth is the medical lead and principal investigator on these projects. None of the other authors have a conflict of interest to declare.
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The Ottawa Hospital Anesthesia Alternate Funds Association (TOHAAFA) supported Dr. Catherine Smyth’s non-clinical time used to work on this article. TOHAAFA also supported several research staff from the Centre for Practice Changing Research at the Ottawa Hospital Research Institute to assist with the preparation of the article (e.g., search strategy, article retrieval, article screening using Distiller SR, obtaining author permissions to reproduce tables/figures, and preparation of references).
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Smyth, C., Ahmadzai, N., Wentzell, J. et al. Intrathecal Analgesia for Chronic Refractory Pain: Current and Future Prospects. Drugs 75, 1957–1980 (2015). https://doi.org/10.1007/s40265-015-0471-1
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DOI: https://doi.org/10.1007/s40265-015-0471-1