Clinical Trial

rTMS on Cannabis Use and Cognitive Outcomes in Schizophrenia

Study Description

Effects of Repetitive Transcranial Magnetic Stimulation (rTMS) on Cannabis Use and Cognitive Outcomes in Schizophrenia

The high prevalence of cannabis and other substance use disorders are a major barrier to recovery in people with schizophrenia. Moreover, schizophrenia patients have significant deficits in cognitive function, which may be exacerbated by cannabis use. Complicating these problems is the lack of evidence-based treatments for co-morbid cannabis use disorders (CUDs) in schizophrenia; there are no established pharmacotherapies. Therefore, this study is investigating the effects of high-frequency (20Hz) repetitive transcranial magnetic stimulation (rTMS) on cannabis use disorder and cognitive function in patients with co-morbid schizophrenia/schizoaffective disorder. The proposed study would be the first randomized, double-blind, sham controlled trial of rTMS in patients with schizophrenia and co-morbid CUD. A total of N=40 schizophrenia smokers with co-morbid cannabis use disorder will be assigned to either active rTMS (N=20) or sham rTMS (N=20) as a treatment regimen of 5X/week treatment for four consecutive weeks. All participants will receive weekly behavioral therapy for 4 weeks. The investigators predict that active rTMS will be well-tolerated and superior to sham rTMS for the treatment of CUD in schizophrenia.

Location

Locations Selected Location

Methods

No pharmaceutical medication involved No pharmaceutical medication involved
Recruiting patients only Recruiting patients only

Device - Repetitive Transcranial Magnetic Stimulation (rTMS)

On Day 1, the resting motor threshold (RMT) will be determined according to previous published methods [Cardenas-Morales et al. 2013] and the rTMS will be delivered at an intensity of 90% of the participant's RMT. rTMS will be administered at 20 Hz (25 trains, 30 pulses per train, 30 second intertrain interval).

Device - Sham Repetitive Transcranial Magnetic Stimulation (rTMS)

On Day 1, the resting motor threshold (RMT) will be determined according to previous published methods [Cardenas-Morales et al. 2013] and the Sham rTMS will be delivered at an intensity of 90% of the participant's RMT. rTMS will be administered at 20 Hz with the B65 placebo coil (25 trains, 30 pulses per train, 30 second intertrain interval).

Behavioral - Weekly Counselling Session

In order to support participants in their abstinence plan, individual weekly sessions of supportive counselling will be administered over the course of the study on 1 time per week over 4 weeks (28 days of abstinence).

Additional Information

Official Study Title

Effects of Repetitive Transcranial Magnetic Stimulation (rTMS) on Cannabis Use and Cognitive Outcomes in Schizophrenia

Clinical Trial ID

NCT03189810

ParticipAid ID

negOYe