Modulating Inhibitory Control Networks in Gambling Disorder With Theta Burst Stimulation

Modulating Inhibitory Control Networks in Gambling Disorder With Theta Burst Stimulation

Patrocinadores

Patrocinador principal: CNS Onlus

Fuente CNS Onlus
Resumen breve

In this project the investigators propose a randomized double-blind placebo-controlled design in which 40 patients with GD will receive active or sham cTBS to the pre-SMA for 2 weeks. The investigators will combine TMS, multimodal structural and functional MRI and behavioral measures in order to identify circuit-level mechanisms of action and therapeutic targets (connectivity changes that explain clinical improvement) and assess the efficacy of TMS in modulating inhibitory control and symptom severity in this population.

Descripción detallada

SPECIFIC AIMS The appropriate interplay of cognitive and reward systems is essential for adaptive human behavior, allowing a homeostatic balance between immediate basic pleasures and long-term planned rewards. Deficits in inhibitory control from cortical cognitive systems over subcortical reward circuits is a key pathophysiological feature of addictive behavior that has not been studied satisfactorily in gambling disorder (GD). The clinical phenotype of this population is characterized by unsuccessful efforts to reduce or stop gambling despite negative outcomes, suggestive of faulty inhibitory control of gambling impulses that sustain the chronicity and comorbidities of this clinical syndrome. Deficits in behavioral and cognitive control constitute a symptom dimension associated with diminished response inhibition in experimental tasks such as the Stop Signal Task (SST). The pre-supplementary motor area (pre-SMA) is a key node of the cognitive control network responsible for response inhibition. Pre-SMA activation has been associated to response inhibition performance in fMRI studies using the SST and recent evidence also suggests that its activity represents a motivational signal for movement. In fact, pre-SMA seems to have a dominant role in bridging the delay between expected reward and specific actions rather than determining whether an action is made. Although the pathophysiology of GD is not well understood, studies have shown altered brain activity in prefrontal regions (including pre-SMA) of GD patients during response inhibition tasks in addition to functional connectivity abnormalities of SMA during rest. These circuit-level abnormalities represent a potential therapeutic target that could be modulated by brain stimulation therapies such as transcranial magnetic stimulation (TMS). Theta burst stimulation (TBS), is a particularly brief and effective form of TMS that can be inhibitory (continuous or cTBS) or excitatory (intermittent or iTBS). Although pre-SMA has been successfully targeted with traditional TMS and TBS for impulse-control disorders like OCD, this approach has never been tested for GD in therapeutic or mechanistic studies. Despite the significant morbidity and mortality of GD, there is a dramatic shortage of effective treatment options for these patients, partly due to the lack of valid pathophysiological models for target discovery and experimental therapeutics. In this project the investigators propose a randomized double-blind placebo-controlled design in which 40 patients with GD will receive active or sham cTBS to the pre-SMA for 2 weeks. The investigators will combine TMS, multimodal structural and functional MRI and behavioral measures in order to identify circuit-level mechanisms of action and therapeutic targets (connectivity changes that explain clinical improvement) and assess the efficacy of TMS in modulating inhibitory control and symptom severity in this population.

Aim 1 (ACUTE MECHANISM OF ACTION): To assess circuit-level effects of a single session of cTBS to the pre-SMA in GD patients. Hypothesis 1.1: cTBS will lead to increase in functional connectivity between cortical inhibitory nodes (pre-SMA) and reward subcortical structures (Nucleus Accumbens, NAc), and these changes will correlate with improvement in reaction time in SST. Hypothesis 1.2: cTBS will not lead to acute changes in FA, RD or AD in the mesocorticolimbic pathway. Hypothesis 1.3: cTBS will lead to increased cognitive control network and decreased NAc activation during SST. Exploratory analyses will test the predictive value of acute circuit changes for clinical improvement after 2 weeks and 1 month follow up.

Aim 2 (CHRONIC MECHANISM OF ACTION): To assess circuit-level effects of 10 session of cTBS to the pre-SMA in GD patients Hypothesis 2.1: cTBS will lead to increases in functional connectivity between preSMA and NAc, and these will correlate with behavioral and clinical improvement. Hypothesis 2.2: cTBS will lead to increased FA and decreased RD and AD in the mesocorticolimbic pathway, and these will correlate with clinical improvement. Hypothesis 2.3: cTBS will lead to further increased cognitive control network and decreased NAc activation during SST, and these will correlate with clinical improvement.

Aim 3 (BEHAVIORAL/CLINICAL): To determine the behavioral and clinical changes of cTBS to the preSMA in GD. Hypothesis 3.1: A single session of cTBS will lead to improvement in reaction time in the SST, but not in symptom severity measured with clinical scales. Hypothesis 3.2: 10 sessions of cTBS will lead to improvement in reaction time in the behavioral inhibition task, in addition to a reduction in clinical severity (including craving/urges) as measured by clinical scales.

Estado general Recruiting
Fecha de inicio May 20, 2018
Fecha de Terminación December 1, 2019
Fecha de finalización primaria December 1, 2019
Fase Phase 3
Tipo de estudio Interventional
Resultado primario
Medida Periodo de tiempo
cTBS effects on gambling symptoms change Baseline - Day 10 (after 10 cTBS sessions) - after 1 month follow-up
cTBS effects on gambling symptoms change Baseline - Day 10 (after 10 cTBS sessions) - after 1 month follow-up
Resultado secundario
Medida Periodo de tiempo
Acute mechanism of action Day 1
Chronic mechanism of action Day 10
Inscripción 40
Condición
Intervención

Tipo de intervención: Device

Nombre de intervención: Transcranial Magnetic stimulation

Descripción: Neuromodulation tool

Elegibilidad

Criterios:

Inclusion Criteria:

1. DSM-5 diagnosis of Gambling Disorder

2. Age between 18 and 65 years

Exclusion Criteria:

1. any additional current psychiatric comorbidity, except for nicotine addiction;

2. a lifetime DSM-5 diagnosis of schizophrenia or other psychotic syndromes, substance dependence or substance abuse, including alcohol, bipolar I or II disorder, mental disorder due to a general medical condition;

3. serious suicide risk;

4. illness duration less than two years;

5. hospitalization in the last 6 months;

6. the inability to receive TMS because of metallic implants, or history of seizures (personal or family history of seizure in first degree relatives);

7. any major medical disease;

8. pregnancy or nursing of an infant;

9. the inability or refusal to provide written informed consent.

Género: All

Edad mínima: 18 Years

Edad máxima: 65 Years

Voluntarios Saludables: No

Ubicación
Instalaciones: Estado: Contacto: CNSOnlus, Institute of Neuroscience Stefano Pallanti, M.D. 55 587889 0039 [email protected]
Ubicacion Paises

Italy

Fecha de verificación

September 2018

Fiesta responsable

Tipo: Principal Investigator

Afiliación del investigador: CNS Onlus

Nombre completo del investigador: Stefano Pallanti

Título del investigador: Professor

Palabras clave
Tiene acceso ampliado No
Condición Examinar
Número de brazos 2
Grupo de brazo

Etiqueta: Active cTBS treatment

Tipo: Active Comparator

Descripción: Active cTBS will be administered with a Magventure MagPro Stimulator R30 using a butterfly coil. TBS consists of bursts of 3 pulses separated by 20ms (i.e. 50 Hz), with each triplet being repeated every 200 ms (i.e. 5 Hz). Stimulus intensities will be set at 80% of AMT. The investigators will use 2 trains of 600 pulses each separated by 1 minute (a total of 1200 pulses).

Etiqueta: Sham cTBS treatment

Tipo: Sham Comparator

Descripción: Sham cTBS will be administered with a Magventure MagPro Stimulator R30 using a butterfly sham coil. The same active cTBS configuration will be used.

Acrónimo TMS-GD
Datos del paciente No
Información de diseño del estudio

Asignación: Randomized

Modelo de intervención: Parallel Assignment

Descripción del modelo de intervención: After selection and enrollment, participants will be screened at baseline with MRI and a complete diagnostic and clinical assessment, described in the following corresponding sections. Using a placebo-controlled double-blind design patients will be randomized to receive active or placebo cTBS.

Propósito primario: Treatment

Enmascaramiento: Triple (Participant, Investigator, Outcomes Assessor)

Descripción de enmascaramiento: Outcome assessor, investigators and participants will be blinded to the type of treatment (active TMS or Placebo)

Fuente: ClinicalTrials.gov