Factors which affect the efficacy of hypnotherapy for IBS: Protocol for a systematic review and meta-regression

Systematic review, meta-analysis with subgroup analysis of hypnotherapy for irritable bowel syndrome, effect of intervention characteristics

BACKGROUND

Hypnotherapy has been shown to be effective at relieving global gastrointestinal symptoms (GGS) in irritable bowel syndrome (IBS). This study examines the impact of hypnotherapy delivery and participant characteristics on IBS outcomes.

METHODS

This systematic review searched CINAHL, Cochrane Library, Conference Citation Index, Embase, PubMed, PsycARTICLES, PsychINFO, Science Citation index-expanded, Social Science Citation Index. Titles and abstracts, then full-text articles were screened against inclusion criteria: trials with a concurrent comparator of hypnotherapy in adults with IBS diagnosed using Manning or ROME criteria, which provided symptom data. Included studies were extracted and assessed for bias using Cochrane Collaboration 2011 guidance. Random-effects meta-analysis was conducted with sub-group analysis to assess the impact of delivery characteristics on outcomes.

RESULTS

Twelve trials were included, 7 in the meta-analyses. Hypnotherapy reduced the risk of GGS, but this was not statistically significant, (standardised mean difference (SMD) 0.24, [-0.06, 0.54], I² 66 %). Higher frequency of sessions (≥1/week) reduced GGS (SMD 0.45 [0.23,0.67] I² 0 %), as did higher volumes of intervention (≥8 sessions with ≥6 h of contact) (SMD 0.51 [0.27,0.76] I² 0 %) and group interventions (SMD 0.45 [0.03, 0.88] I² 62 %). Only volume of intervention produced a significant effect between the subgroups.

CONCLUSION

This review suggests that high volume hypnotherapy is more beneficial than low and should be adopted for GDH. Both high frequency and group interventions are effective in reducing GGS in IBS. However, the sample size is small and more studies are needed to confirm this.

Gut-focused hypnotherapy for Functional Gastrointestinal Disorders: Evidence-base, practical aspects, and the Manchester Protocol

BACKGROUND

Despite their high prevalence and advances in the field of neurogastroenterology, there remain few effective treatment options for functional gastrointestinal disorders (FGIDs). It is recognized that approximately 25% of sufferers will have symptoms refractory to existing therapies, causing significant adverse effects on quality of life and increased healthcare utilization and morbidity. Gut-focused hypnotherapy, when delivered by trained therapists, has been shown to be highly effective in severe refractory FGIDs. However, hypnotherapy continues to be surrounded by much misunderstanding and skepticism.

PURPOSE

The purpose of this review is to provide a contemporary overview of the principles of gut-focused hypnotherapy, its effects on gut-brain interactions, and the evidence-base for its efficacy in severe FGIDs. As supplementary material, we have included a hypnotherapy protocol, providing the reader with an insight into the practical aspects of delivery, and as a guide, an example of a script of a gut-focused hypnotherapy session.