Adapted Cognitive/Affective Remediation for Cannabis Misuse in Schizophrenia

Study Overview
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Brief Summary
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This study will integrate and adapt a cognitive remediation (Cognitive Enhancement Therapy [CET]) and an affect regulation (Personal Therapy [PT]) intervention for 50 individuals with schizophrenia that misuse cannabis. Participants will be randomized to CET/PT plus treatment as usual (TAU) or TAU alone and treated for 18 months.

Detailed Description
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Schizophrenia is a severe and chronic mental illness that places significant burden on the individuals who suffer from it, their families, and society. One of the most vexing problems in the treatment of schizophrenia is the high rate of substance use comorbidity. The majority of schizophrenia patients experience substantial cognitive and affective impairments. Consistent deficits have been observed in the broad domains of neurocognition(e.g., attention, memory, and problem-solving), social cognition (e.g., perspective-taking, foresight, social cue recognition), and affect regulation, which are major contributors to functional impairment in the disorder. These cognitive and affective deficits may be exacerbated among schizophrenia patients that misuse substances and because these deficits are untreated by current pharmacotherapeutic strategies many turn to cannabis and other drugs to cope. Cognitive Enhancement Therapy (CET) is a treatment that has proved effective in improving cognition in individuals with schizophrenia. Personal Therapy (PT) is a treatment designed to help individuals with the affective deficits that may lead to substance misuse for individuals with schizophrenia. This study will adapt and integrate CET and PT to test whether this intervention is better or more effective for treating substance misusing schizophrenia patients than the usual treatment received (Treatment as Usual or TAU). Participation in this study will last 18 months. Eligible participants will be randomly assigned to receive either CET/PT or TAU. Participants that receive the CET/PT condition must be able to attend weekly treatment sessions in Pittsburgh, PA. All participants will complete cognitive, functional, and affective outcome measures at the beginning of the study, 6-months, 12-months, and at 18-months regardless of treatment assignment. Results from all outcome measures will be used to estimate the effectiveness of CET/PT for individuals that have schizophrenia and misuse substances.

Official Title
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Adapted Cognitive/Affective Remediation for Cannabis Misuse in Schizophrenia

Conditions
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Schizophrenia, Schizoaffective Disorder

Intervention / Treatment
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* Behavioral: CET/PT
* Behavioral: Treatment as Usual


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Diagnosis of schizophrenia or schizoaffective disorder confirmed by the Structured Clinical Interview for DSM-IV Disorders (SCID). Cannabis severity scores of moderate or higher on the Addiction Severity Index (ASI). present with significant cognitive disability based on the Cognitive Style and Social Cognition Eligibility Interview Intelligence quotient (IQ) greater than 80 Ability to read and speak fluent English Ability to attend weekly treatment sessions in Pittsburgh, PA. Exclusion Criteria: Organic Brain Syndrome English Language below a sixth grade level Persistent suicidal or homicidal behavior comorbid medical disorders producing cognitive impairment receipt of substance abuse pharmacotherapies (e.g., naltrexone)

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 55 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: CET/PT<br>Behavioral Intervention: Participants will receive adapted Cognitive Enhancement Therapy/Personal Therapy. | Behavioral: CET/PT<br>* CET/PT is an 18-month comprehensive small group approach for the remediation of cognitive deficit in schizophrenia consisting of individual sessions and 45 group training sessions in social cognition that are integrated with an affect regulation approach and 60 hours of computer assisted training in attention, memory, and problem solving skills.<br>|
| Active Comparator: Treatment as Usual<br>Behavioral Intervention: Participants will receive treatment as usual. | Behavioral: Treatment as Usual<br>* The usual care individuals with schizophrenia that misuse substances receive in the community for their conditions.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Cognitive/Affective Functional Outcomes | This research seeks to determine whether cannabis misusing schizophrenia patients assigned to CET/PT show better cognitive/affective functional outcomes compared to patients assigned to TAU. The degree of change from baseline to 6-, 12-, and 18-months will be examined in accordance with the following cognitive/affective measures: NIMH-MATRICS battery (Green et al., 2004),the Wisconsin Cart Sorting Test (Heaton et al., 2003), and the Mayer-Salovey-Caruso Emotional Intelligence Test (Mayer, Salovey, Caruso & Sitarenios, 2003). | Baseline, 6-month, 12-month and 18 month | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Substance Use Outcomes | This research seeks to determine whether cannabis misusing schizophrenia patients assigned to CET/PT show reduced substance usage rates compared to patients assigned to TAU. The degree of change in substance use from baseline to 6-, 12- and 18-month time points will be examined in accordance with the following measures for patients receiving either intervention assignment: the Timeline Follow-Back Method (Sobell, Maisto & Sobell, 1995) and the Addiction Severity Index (McLellan et al., 1980). | Baseline, 6-month, 12-month 18-month | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Schizophrenia, Schizoaffective Disorder, Cannabis, Alcohol, Substance Misuse, Cognition, Psychosocial Treatment, Cognitive Enhancement Therapy, Personal Therapy, Treatment as Usual