Bipolar disorder (BD) is a severe mental health illness affecting 1.9% to 2.4% of the population and is associated with high inter episode distress, ongoing mood swings (mood variability), high suicide risks and high co-morbidity (especially anxiety). 50% of patients do not recover within one year, and only 25% of patients achieve full recovery of function, despite receiving the recommended lead intervention consisting of pharmacotherapy (mood stabilisers such as lithium). Added psychoeducation and cognitive behavioural interventions (CBT) have only modest effects. Overall there is consensus for the need to update CBT and increase its effectiveness, aimed at not only managing symptoms but also targeting perpetuating or precipitating factors influencing symptoms, especially mood variability.~Recent studies suggest that patients with BD experience more vivid, compelling and upsetting mental images compared to patients suffering from unipolar depression and healthy controls and that this may contribute to or even maintain their clinical difficulties. That is, imagery in experimental research has proven to have a stronger effect on mood changes than verbal cognitions. The amplified imagery vividness of patients suffering from BD might therefore precipitate or perpetuate their mood variability. In many other mental health problems imagery interventions as a stand-alone intervention, or added to regular CBT, are offered with the aim to decrease imagery vividness or modify/update appraisals of imagery. In BD patients such interventions, therefore, might also target important precipitating or perpetuating factors influencing their mood problems.~This study aims to assess the effectiveness of a brief Imagery-focussed Cognitive Therapy (imCT) compared to psychoeducation, regarded as treatment as usual for this patient population, in patients suffering from BD receiving mood stabilising medication. ImCT was successfully tested in a pilot study using a case series design. The investigators now elaborate on this study comparing effectiveness of the intervention to psychoeducation/TAU. The investigators hypothesise that (1a) mood variability (primary outcome variable) and (1b) symptoms of depression, mania and anxiety (secondary outcome variables) show stronger decreases in BD patients receiving imCT than in patients receiving psychoeducation/TAU. Moreover, (2) in the imCT group this effect is expected to be mediated by changes in imagery which is targeted during this intervention (target imagery). The investigators also hypothese that (3) imagery frequency and compellingness and vividness of imagery reduce more in the imCT group than in the group receiving psychoeducation/TAU. The primary outcome variable, mood variability, is calculated using daily mood measurements, during a 4-week baseline, during the invention and after the end of intervention until follow up at 16 weeks, in both imCT and psychoeducation/TAU. Most secondary outcome variables are assessed using weekly online questionnaires, pre-and post intervention and at 8 and 16 weeks follow-up, anxiety is calculated both weekly online and using daily measurements (see below).
This study explores the effectiveness of a brief Imagery-focussed Cognitive Therapy (imCT) compared to psychoeducation, regarded as treatment as usual for this patient population, in patients suffering from BD receiving mood stabilising medication. ImCT was successfully tested in a pilot study using a case series design. The investigators now elaborate on this study comparing effectiveness of the intervention to psychoeducation/TAU.