TICS-CIHR: TICS: Transcranial Magnetic Stimulation for Intervening in Children With Tourette's Syndrome (CIHR)
Study Details
Study Description
Brief Summary
Tourette's Syndrome (TS) is characterized by repetitive movements and vocalizations called tics. Due to the suffering caused by TS, children and adolescents often require treatment for their tics. The investigators' research focuses on developing novel repetitive transcranial magnetic stimulation (rTMS) interventions for child and adolescent neuropsychiatric disorders. In this project, the investigators will determine the effect of pairing 3 weeks of rTMS and HRT on tic severity and plasticity as indexed by supplementary motor area (SMA) y-aminobutyric acid (GABA) concentration and functional connectivity of the SMA to the primary motor cortex (M1) in children and adolescents with TS.
Children (N = 50, 6-18 years) with TS will be randomized to either a (1) rTMS+HRT arm, or (2) sham rTMS+HRT. Outcome measures will examine tic severity (primary), brain chemistry and function (secondary) at baseline and then at week 7. The investigators' proposed aims are:
(Aim 1) To determine the effect of paired rTMS and HRT on tic severity as measured by the Yale Global Tic Severity Scale (YGTSS) by comparing it to sham rTMS + HRT.
1-1: The investigators hypothesize that tic severity will decrease from baseline to post-treatment.
1-2: The investigators also hypothesize that the reduction in tic severity will be greater in the paired treatment group (rTMS+HRT > Sham rTMS+HRT).
(Aim 2) To determine the effect of paired rTMS and HRT on brain plasticity compared to sham rTMS + HRT.
2-1: The investigators hypothesize that patients treated with the paired rTMS and HRT will have a greater increase in GABA concentration comparted to sham and HRT.
2-2: The investigators also hypothesize that functional connectivity between the SMA and M1 will be greater with paired treatment (rTMS+HRT > Sham rTMS+HRT).
Condition or Disease | Intervention/Treatment | Phase |
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N/A |
Detailed Description
Tourette's Syndrome (TS) is characterized by repetitive movements and vocalizations called tics. Due to the suffering caused by TS, children and adolescents often require treatment for their tics. Tic severity predicts poor outcomes across physical, psychological, and cognitive domains in youth. Current treatments for TS remain limited in scope and efficacy. Atypical antipsychotics are often used and for many patients have an unacceptable side effect burden. Behavioral treatments, like habit reversal therapy (HRT), show promise and are safe, but are predicated on a certain level of brain maturation to execute.
The investigators' research focuses on developing novel repetitive transcranial magnetic stimulation (rTMS) interventions for child and adolescent neuropsychiatric disorders. Plasticity, precision, and pairing are key considerations in this process. In this project, the investigators will determine the effect of pairing 3 weeks of rTMS and HRT on tic severity and plasticity as indexed by supplementary motor area (SMA) y-aminobutyric acid (GABA) concentration and functional connectivity of the SMA to the primary motor cortex (M1) in children and adolescents with TS. The investigators will use functional magnetic resonance imaging (fMRI) and robot controlled rTMS to precisely target the SMA. The investigators believe this pairing will provide improved relief by inducing plasticity to retrain the brain to be better at suppressing tics at an earlier age than usually expected.
Children (N = 50, 6-18 years) with TS will be randomized to either a (1) rTMS+HRT arm, or (2) sham rTMS+HRT. Outcome measures will examine tic severity (primary), brain chemistry and function (secondary) at baseline and then at week 7. The investigators' proposed aims are:
(Aim 1) To determine the effect of paired rTMS and HRT on tic severity as measured by the Yale Global Tic Severity Scale (YGTSS) by comparing it to sham rTMS + HRT.
1-1: The investigators hypothesize that tic severity will decrease from baseline to post-treatment.
1-2: The investigators also hypothesize that the reduction in tic severity will be greater in the paired treatment group (rTMS+HRT > Sham rTMS+HRT).
(Aim 2) To determine the effect of paired rTMS and HRT on brain plasticity compared to sham rTMS + HRT.
2-1: The investigators hypothesize that patients treated with the paired rTMS and HRT will have a greater increase in GABA concentration comparted to sham and HRT.
2-2: The investigators also hypothesize that functional connectivity between the SMA and M1 will be greater with paired treatment (rTMS+HRT > Sham rTMS+HRT).
Study Design
Arms and Interventions
Arm | Intervention/Treatment |
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Experimental: rTMS + CBIT Repetitive transcranial magnetic stimulation (rTMS) and Comprehensive Behavioural Intervention for Tics (CBIT) |
Device: rTMS + CBIT
Repetitive Transcranial Magnetic Stimulation (rTMS) parameters are: intensity 100% resting motor threshold (RMT), frequency 1Hz, duration = 30 minutes (1800 stimulations; 900 per side), target - the supplementary motor area (SMA). Treatments occur on weekdays (T - F) for four weeks (20 total).
The Comprehensive Behavioral Intervention for Tics (CBIT) will be completed over eight sessions that will average 60 minutes in duration. First, participants will undergo awareness training. Participants will then be introduced to competing response training, which involves performing a voluntary behaviour designed to disrupt the execution of the tic. The eight sessions will occur on Mondays, once a week for six weeks and then on weeks 8 and 10.
Behavioral: Sham rTMS + CBIT
Sham rTMS (sham coil) will be paired with CBIT. Sham rTMS will be delivered over the same time-frame as above. CBIT will be identical to the above.
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Active Comparator: Sham rTMS + CBIT Sham repetitive transcranial magnetic stimulation (rTMS) and Comprehensive Behavioural Intervention for Tics (CBIT) |
Behavioral: Sham rTMS + CBIT
Sham rTMS (sham coil) will be paired with CBIT. Sham rTMS will be delivered over the same time-frame as above. CBIT will be identical to the above.
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Outcome Measures
Primary Outcome Measures
- Yale Global Tic Severity Scale Total Tic score (YGTSS) [Baseline to week 7]
30% reduction in Yale Global Tic Severity Scale Total Tic score (YGTSS) (~9 point reduction). A higher score on all scales suggests a more severe tics. The YGTSS provides two tic severity scores: Total Motor (0 to 25) Total Phonic (0 to 25) These are summed to form the Total Tic Severity Score (0 to 50). This is the measure for the primary outcome variable. There is also the separate Impairment Dimension Score (0 to 50). The total score is hence 0 to 100 (sum of Total Tic Severity Score and Impairment Dimension Score).
Secondary Outcome Measures
- Supplementary Motor Area (SMA) GABA concentration as measured by LCModel (Institutional Units) [Baseline to week 7]
10% increase in GABA concentration in the Supplementary Motor Area (SMA) as measured by LCModel (Institutional Units)
- Functional connectivity of the Supplementary Motor Area (SMA) and the dominant Primary Motor Cortex (M1) [Baseline to week 7]
Functional connectivity, as measured using SPM12, of the Supplementary Motor Area (SMA) and the dominant Primary Motor Cortex (M1).
Other Outcome Measures
- Yale Global Tic Severity Scale Total Tic score (YGTSS) post CBIT [Baseline to week 11]
30% reduction in YGTSS (~9 point reduction) 30% reduction in Yale Global Tic Severity Scale Total Tic score (YGTSS) (~9 point reduction). A higher score on all scales suggests a more severe tics. The YGTSS provides two tic severity scores: Total Motor (0 to 25) Total Phonic (0 to 25) These are summed to form the Total Tic Severity Score (0 to 50). This is the measure for this outcome variable. There is also the separate Impairment Dimension Score (0 to 50). The total score is hence 0 to 100 (sum of Total Tic Severity Score and Impairment Dimension Score).
Eligibility Criteria
Criteria
Inclusion Criteria:
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Diagnosis of Tourette's syndrome
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IQ greater than 80
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English fluency (to enable assent and consent).
Exclusion Criteria:
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Diagnosis of mania or schizophrenia
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Impediments to TMS or MRI.
Contacts and Locations
Locations
Site | City | State | Country | Postal Code | |
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1 | Alberta Children's Hospital | Calgary | Alberta | Canada | T3B 6A8 |
Sponsors and Collaborators
- University of Calgary
- Canadian Institutes of Health Research (CIHR)
Investigators
- Principal Investigator: Frank P MacMaster, PhD, University of Calgary
Study Documents (Full-Text)
None provided.More Information
Publications
None provided.- REB18-0220