Does cannabis use impact cognitive behavioural therapy outcomes for anxiety and related disorders? A preliminary examination.

OBJECTIVES: The current study examined whether cannabis use frequency and cannabis-related problem severity (as per the Cannabis Use Disorder Identification Test-Revised) predicted outcomes of cognitive behavioural therapy (CBT) for anxiety and related disorders. It was predicted that greater frequency of cannabis use and greater cannabis-related problem severity would be associated with dampened treatment outcomes compared to less severe cannabis use presentations. METHODS: Participants were 253 adults seeking treatment for anxiety and related disorders. Cannabis use was categorized as non-use (n = 135), infrequent use (using monthly to 4 times per month; n = 45), and frequent use (using 2 or more times per week; n = 73). Individuals who reported using cannabis completed cannabis use and cannabis-related problem measures before starting a CBT group. Participants also completed a weekly symptom-specific measure of anxiety symptoms throughout CBT. RESULTS: As hypothesized, frequent cannabis use was associated with poorer outcomes in CBT for anxiety and related disorders compared to non-use. Despite this, individuals who used cannabis frequently still experienced a statistically significant decrease in their anxiety symptoms from pre-to post-CBT, with a large effect size (d = -0.87). Cannabis-related problems was not a significant predictor of CBT outcomes. CONCLUSIONS: Cannabis use frequency was associated with poorer CBT outcomes for anxiety and related disorders, however these individuals still made notable treatment gains. The mechanism driving this relationship remains unclear. Future studies should attempt to replicate the current findings and examine possible mechanisms.

Exposure to stressful and traumatic life events in hoarding: Comparison to clinical controls.

BACKGROUND: Individuals with hoarding report stressful and traumatic life events at an elevated rate compared with those with obsessive-compulsive disorder and healthy controls, but have not been compared with other clinical groups. This study compared rates of traumatic life events between those with clinically significant hoarding, anxiety disorders, or posttraumatic stress disorder (PTSD), hypothesizing that rates would be higher in the hoarding and PTSD groups than the anxiety group. METHODS: Rates of traumatic and stressful events were compared across groups. RESULTS: All comparisons across groups on types of events were significant (partial-eta squared 0.051-0.162). The hoarding group endorsed significantly more crime-related events but similar rates of other events as compared to the PTSD and anxiety disorder groups. CONCLUSION: These findings suggest that many stressful and traumatic life events are not uniquely elevated in hoarding when compared with other clinical populations.

Preliminary Findings for Group Transdiagnostic Behavior Therapy for Affective Disorders Among Youths.

OBJECTIVE: The literature on transdiagnostic psychotherapy among youths is limited. Group transdiagnostic behavior therapy (TBT) has been shown to be effective for adults with affective disorders and may contain beneficial features for youths (e.g., behavioral focus, group format, ease of dissemination, and diversity of targeted diagnoses). This study aimed to investigate group TBT among youths in Canada to determine its feasibility and efficacy. METHODS: Twenty participants (ages 16-19) diagnosed as having a principal anxiety disorder completed 12 sessions of group TBT. Symptoms of anxiety, depression, and transdiagnostic impairment were assessed pre- and posttreatment. RESULTS: Participants demonstrated significant improvements on measures of anxiety (general, cognitive, and somatic) and stress, with moderate effect sizes. Findings for symptoms of depression and transdiagnostic impairment were unreliable, with small effect sizes. CONCLUSIONS: These findings provide preliminary support for the use of group TBT among youths with anxiety disorders. Future research should incorporate comparison groups and larger samples.