N-of-1 randomized trials to assess the efficacy of gabapentin for chronic neuropathic pain

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Title N-of-1 randomized trials to assess the efficacy of gabapentin for chronic neuropathic pain
Author Yelland, Michael; Poulos, Christopher J.; Pillans, Peter I.; Bashford, Guy M.; Nikles, Catherine Jane; Sturtevant, Joanna M.; Vine, Norma; Mar, Christopher B. Del; Schluter, Philip J.; Tan, Meng; Chan, Jonathan; Mackenzie, Fraser; Brown, Robyn
Journal Name Pain Medicine
Year Published 2009
Place of publication United States
Publisher Wiley-Blackwell Publishing
Abstract Objective. The objective of this study was to compare the efficacy of gabapentin with placebo for neuropathic pain at the individual and population levels. Design. This study used an n-of-1 trial methodology with three double-blind, randomized, crossover comparisons of gabapentin with placebo. Setting. This study was carried out at specialist outpatient clinics at two Australian hospitals. Patients. The patients are adults with chronic neuropathic pain. Interventions. Following a dose-finding period, participants underwent three comparisons of 2-week periods on gabapentin (600–1,800 mg per day) and placebo. The dose-finding period was commenced by 112 patients, of whom 39 had no response so they did not enroll, leaving 73 trial participants. Of these, 48 completed and 7 partially completed their trials, and 18 withdrew. Outcome Measures. The five outcome measures were the visual analog scale (0–10) of pain, sleep interference and functional limitation; frequency of adverse events and medication preference. The aggregate response was determined by weighting the response to each measure equally. Results. Of the 55 participants who completed at least one cycle, the aggregate response to gabapentin was better than placebo in 16 (29%), of whom 15 continued gabapentin posttrial. No difference was shown in 38 (69%), and 1 (2%) showed a better response to placebo. Fifteen of these 39 continued gabapentin posttrial. Meta-analysis of the mean scores showed lower mean (standard deviation) scores for gabapentin by 0.8 (0.2) for pain, 0.6 (0.2) for sleep interference, and 0.6 (0.2) for functional limitation.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1111/j.1526-4637.2009.00615.x
Copyright Statement Copyright 2009 The American Academy of Pain Medicine. Published by Blackwell Publishing. This is the pre-peer reviewed version of the following article: N-of-1 randomized trials to assess the efficacy of gabapentin for chronic neuropathic pain, Pain Medicine Volume 10, Issue 4, 2009, 754-761, which has been published in final form at 10.1111/j.1526-4637.2009.00615.x.
Volume 10
Issue Number 4
Page from 754
Page to 761
ISSN 1526-2375
Date Accessioned 2010-04-24
Date Available 2010-11-03T07:05:50Z
Language en_AU
Research Centre Griffith Health Institute; Centre for Musculoskeletal Research
Faculty Griffith Health Faculty
Subject Biological Psychology (Neuropsychology, Psychopharmacology, Physiological Psychology)
URI http://hdl.handle.net/10072/30570
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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