Objective
Chronic Pain (CP) is a disabling illness, often comorbid with depression. We performed a randomized controlled pilot study on mindfulness-based cognitive therapy (MBCT) targeting depression in a CP population.
Methods
Participants with CP lasting ≥ 3 months, DSM-IV Major Depressive Disorder (MDD), Dysthymic Disorder, or Depressive disorder NOS, and a Quick Inventory of Depression scale (QIDS-C16) score ≥ 6 were randomized to MBCT (n = 26) or waitlist (n = 14). We adapted the original MBCT intervention for depression relapse prevention by modifying the psychoeducation and Cognitive Behavioral Therapy (CBT) elements to an actively depressed chronic pain population. We analyzed an intent-to treat (ITT) and a per protocol sample; the per protocol sample included participants in the MBCT group who completed at least 4 out of 8 sessions. The change in the QIDS-C16 and Hamilton Rating Sale for Depression (HRSD17) were the primary outcome measures. Pain, quality of life and anxiety were secondary outcome measures. Data collection took place between January 2012 and July 2013.
Results
Nineteen (73%) participants completed the MBCT program. No significant adverse events were reported in either treatment group. ITT analysis (n=40) revealed no significant differences. Repeated measures ANOVAs for the per protocol sample (n=33) revealed a significant treatment × time interaction (F (1, 31) = 4.67, p = 0.039, η2p = 0.13) for the QIDS-C16, driven by a significant decrease in the MBCT group (t (18) = 5.15, p < 0.001, d = 1.6), but not in the control group (t (13) = 2.01, p = 0.066). The HRSD17 scores did not differ significantly between groups. The study ended before the projected sample size was obtained, which might have prevented effect detection in some outcome measures.
Conclusions
MBCT shows potential as a treatment for depression in individuals with CP, but larger controlled trials are needed.
Trial registration
www.clinicaltrials.gov. Identifier: NCT01473615