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Clinical Trial Summary

The current clinical trial is focused on evaluating the efficacy of rTMS for treatment of depression in youth and young adults (hereafter called transition aged youth, TAY) with autism spectrum disorder (ASD). The motivation to undertake the current efficacy study is driven by: (1) the substantial impact of depression on TAY with ASD (based on prevalence and contribution to disability/impairment); (2) lack of evidence-based treatments for depression in autism (there are no current trials rigorously evaluating any treatment for depression, i.e., psychotherapeutic, pharmacotherapeutic, brain stimulation); (3) rTMS has demonstrated efficacy in non-autistic individuals to improve symptoms of depression and may be better tolerated in youth than medication treatment; (4) a prior pilot rTMS study focused on treatment of executive function deficits in autism indicated that high frequency rTMS delivered using a rigorous randomized control trial (RCT) protocol can be feasibly implemented in TAY with autism, is well tolerated (mild to moderate adverse effects and low drop out), and has the potential to improve symptoms of depression.


Clinical Trial Description

The investigators will use a randomized, double-blind, sham-controlled design of bilateral theta burst stimulation (BL-TBS) to dorsolateral prefrontal cortex (DLPFC) administered 5 days per week for 6 weeks (30 sessions). The investigators will recruit n=80, 16-35 year old participants with autism that do not have co-occurring intellectual disability (ID). In the current study, the target population will be individuals with autism, without ID who have co-occurring clinically significant depression. Pre/post treatment MRI will be used to study mechanisms of treatment response. The investigators will build on their previous pilot rTMS study in autism with two key innovations. First, the investigators will use theta burst stimulation (TBS) for depression as opposed to conventional rTMS. TBS is a newer form of rTMS shown to be non-inferior to conventional rTMS for depression with a similar safety profile. Tolerance of intermittent TBS (iTBS, delivered at 100% RMT to right DLPFC in ten 9-17 year-olds with ASD) has already been shown in autism in a prior open-label study. Importantly, TBS can be delivered in a fraction of the time needed for conventional rTMS. This shorter administration time may be critical for participant retention as sensory sensitivity is a major feature of autism. A shorter administration also has important practical implications for future clinical access. The investigators will use BL-TBS based on: preliminary data of improved antidepressant efficacy with a bilateral (over unilateral) TBS approach that combines left excitatory with right inhibitory DLPFC stimulation, as well as findings that bilateral (over unilateral) rTMS may improve suicidal ideation in MDD. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT04972136
Study type Interventional
Source Centre for Addiction and Mental Health
Contact Anjuli G Ner, HBSc
Phone 416-535-8501
Email anjuli.ner@camh.ca
Status Recruiting
Phase N/A
Start date January 14, 2021
Completion date January 14, 2027

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