Four-step Mindfulness-based Therapy for Chronic Pain: A Pilot Randomized Controlled Trial.

摘要

Objective: Chronic pain is a common condition worldwide that poses significant impact to society in terms of its health and economic costs. It has been found to be related to a number of emotional and cognitive factors that are amenable to psychological treatments. Traditional cognitive-behavioral therapy (CBT) for chronic pain has become the gold standard of psychological treatment with reported efficacy. However, recent meta-analyses have found its effect size to be only modest at most. Moreover, its specific mechanisms of action are not well elucidated. With recent advances in neuroscience on possible neurocognitive processes underlying chronic pain, alternative treatment models targeting these specific neurocognitive processes are worth exploring. The present study tested the effectiveness of the Four-step Mindfulness-based Therapy (FSMT) for chronic pain in a randomized-controlled trial. The FSMT was chosen because of its explicit emphasis on altering neurocognitive processes that appear to be highly relevant in treating chronic pain. Method: Ninety-nine chronic pain patients in a hospital cluster-based outpatient pain clinic were randomly allocated to either the FSMT treatment or wait-list control group. The FSMT was modified for use with chronic pain and incorporated mindfulness exercises, such as mindful breathing and mindful meditation. Treatment consisted of eight weekly two-hour group sessions conducted by a clinical psychologist experienced in the implementation of the FSMT protocol. Assessment took place at baseline and post-treatment for both the FSMT and wait-list control. For the FSMT, assessment also took place at mid-group and 3-month follow-up. Results: Findings showed that the FSMT produced superior outcomes in terms of activity interference (primary endpoint), pain unpleasantness, and depression when compared to the wait-list control group or over time. Improvements were also found in the process measures of pain catastrophizing and pain acceptance. All treatment effects were maintained at follow-up. Further, the effects have been shown to be clinically significant and reliable above and beyond measurement errors. Mediational analyses revealed that pain catastrophizing and pain acceptance mediated the effects of FSMT on the outcomes of activity interference and depression; pain catastrophizing also mediated the effect of FSMT on the outcome of pain unpleasantness. Conclusions: The present study was the first to establish statistical and clinical evidence of the FSMT for chronic pain. It also revealed possible processes and mechanisms that might have brought about the changes in outcome, namely reduction in pain catastrophizing and improvement in pain acceptance. How the FSMT led to the outcome changes via these two processes was discussed and enriched by neurocognitive perspectives. Future studies should seek to further compare the FSMT with other active psychological treatments for chronic pain and collect neuroimaging data to further illustrate the neurocognitive processes involved.