Overcoming Psychomotor Slowing in Psychosis (OCoPS-P)

University of Bern

Status: Completed

Conditions: Schizophrenia; Schizoaffective Disorder; Schizophrenia and Related Disorders; Brief Psychotic Disorder

Treatments: Device: iTBS; Device: 1 Hz rTMS; Drug: Placebo

Study type: Interventional

Funder types: Other

Identifiers

NCT03921450

2018-02164

Details and patient eligibility

About

Psychomotor slowing is a major problem in psychosis. Aberrant function of the cerebral motor system is linked to psychomotor slowing in patients, particularly resting state hyperactivity in premotor cortices. A previous clinical trial indicated that inhibitory stimulation of the premotor cortex would reduce psychomotor slowing. The current study is further exploring this effect in a randomized, placebo-controlled, double-blind design with three arms of transcranial magnetic stimulation and measures of brain imaging and physiology prior to and after the intervention.

Full description

As psychomotor slowing is a major problem in schizophrenia, contributing to poor functional outcome, and as no current treatment is effectively targeting psychomotor slowing, this study seeks to test noninvasive brain stimulation to overcome psychomotor slowing. Previous studies documented an aberrant increase of neural activity within the supplementary motor area (SMA) in patients with schizophrenia who had psychomotor slowing. Furthermore, a pilot study in major depression and schizophrenia indicated that inhibitory 1 Hz repetitive transcranial magnetic stimulation (rTMS) would improve psychomotor slowing in 82% of the participants. While this is encouraging, further evidence is needed to 1) replicate the clinical effect of 1 Hz rTMS on the SMA in schizophrenia, 2) to test against sham stimulation, facilitatory stimulation and no intervention, and 3) to test the effects of rTMS on the neural circuitry. Therefore, OCoPS includes more patients, more treatment arms, and more outcome variables than the first pilot trial.

Here we will enroll 88 patients with schizophrenia spectrum disorders and severe psychomotor slowing according to a standard rating scale. Subjects will be randomized to four arms, three of which are double blinded.

three weeks of daily rTMS over the SMA will be delivered. The first group receives inhibitory 1 Hz rTMS, the second group receives facilitatory intermittent theta burst stimulation (iTBS), and the third group receives sham stimulation with a placebo-coil. The fourth group will have no rTMS during the first three weeks, but will repeat the baseline measures after three weeks and then enter a treatment with 1Hz rTMS for three weeks. Outcome measures include the Salpetriere Retardation Rating Scale, observer ratings of motor behavior as well as measures of functioning. After the interventions, follow-up visits are planned at week 6 and week 24.

Finally, at baseline and after the rTMS course, patients will undergo MRI scanning for structural and functional alterations of the cerebral motor system.

Enrollment: 103 patients

Sex: All

Ages: 18 to 60 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Right-handed subjects
• Ability and willingness to participate in the study
• Ability to provide written informed consent
• Informed Consent as documented by signature
• Schizophrenia spectrum disorder according to diagnostic and statistical manual version 5 (DSM-5) criteria with current psychomotor slowing according to the Salpetriere Retardation Rating Scale (SRRS), score >= 15

Exclusion criteria

• Substance abuse or dependence other than nicotine
• Past or current medical or neurological condition associated with impaired or aberrant movement, such as brain tumors, stroke, M. Parkinson, M. Huntington, dystonia, or severe head trauma with subsequent loss of consciousness.
• Epilepsy or other convulsions
• History of any hearing problems or ringing in the ears
• Standard exclusion criteria for MRI scanning and TMS; e.g. metal implants, claustrophobia
• Patients only: any TMS treatment in the past 3 months
• Women who are pregnant or breast feeding,
• Intention to become pregnant during the course of the study,
• Female participants who are surgically sterilised / hysterectomised or post-menopausal for longer than 2 years are not considered as being of child bearing potential.
• Previous enrolment into the current study,
• Enrolment of the investigator, his/her family members, employees and other dependent persons
• Controls only: history of any psychiatric disorder or first-degree relatives with schizophrenia spectrum disorders.

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Triple Blind

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103 participants in 4 patient groups, including a placebo group

Inhibitory repetitive transcranial magnetic stimulation (rTMS)

Experimental group

Description:

1 Hz stimulation of 17 mins over the supplementary motor area (SMA), 1000 pulses at 110% resting motor threshold intensity total of 15 sessions in 3 weeks

Treatment:

Device: 1 Hz rTMS

Facilitatory intermittent theta burst stimulation (iTBS)

Active Comparator group

Description:

Intermittent theta burst stimulation of 50 Hz over the supplementary motor area (SMA) with 600 pulses in 2 sec trains every 10 seconds for 190 seconds total. Two iTBS stimulations will be administered with 15 mins pause in between. total of 15 sessions in 3 weeks

Treatment:

Device: iTBS

Placebo

Placebo Comparator group

Description:

1 Hz stimulation of 17 mins over the supplementary motor area (SMA) without any magnetic emission using a placebo-coil that looks identical and makes identical sounds as the real TMS coil total of 15 sessions in 3 weeks

Treatment:

Drug: Placebo

Waiting group

No Intervention group

Description:

This group will receive no intervention for 3 weeks. Afterwards they will receive the inhibitory rTMS protocol as in the first arm