A Randomized Controlled Trial of Cognitive Remediation and D-cycloserine for Individuals With Bipolar Disorder

Phase 3

Completed

Conditions: Bipolar Disorder

Interventions: Other: CR + placebo
Other: CR + DCS (D-cycloserine)

Registration Number: NCT01934972

Lead Sponsor: University of Arizona

Brief Summary: Individuals with bipolar suffer from problems in basic cognitive skills such as memory and concentration. Unfortunately, there are no current treatments that have been shown to improve cognitive skills among individuals with bipolar disorder.

Computerized cognitive remediation (CR) is a treatment that has been shown to improve cognitive skills among individuals with serious mental illnesses other than bipolar disorder, such as schizophrenia. This treatment involves completing a series of activities on a computer that have been shown to improve cognitive skills.

D-cycloserine (DCS) is an antibiotic traditionally used in the treatment of tuberculosis. Recent studies have suggested that this drug may also improve individuals' ability to learn. Thus, the goal of our study is to examine whether receipt of d-cycloserine increases the benefit that individuals receive from participation in cognitive remediation.

To test this hypothesis, approximately forty subjects will be randomized to one of two study arms: \[i\] CR + DCS or \[ii\] CR + placebo. We will examine whether d-cycloserine increases the benefit that individuals with bipolar disorder receive from participation in cognitive remediation.

Detailed Description: Individuals with bipolar disorder suffer from a broad array of cognitive deficits that may hinder their ability to achieve successful community functioning. Consequently, greater attention has recently been directed toward the development of strategies to ameliorate these cognitive deficits. One strategy which has been shown to be successful in this endeavor is cognitive remediation (CR). This intervention, which is recognized as a "best practice" in the treatment of serious mental illness, is typically comprised of a series of repeated exercises delivered by a clinician or via a computer that are designed to improve performance in cognitive functioning. Yet, despite the promise of cognitive remediation, the benefit of this intervention among individuals with bipolar disorder has yet to be investigated.

Recently, studies have demonstrated that d-cycloserine (DCS), an N-methyl-D-aspartate receptor (NMDAR) agonist, may facilitate the learning process for emotional and non-emotional information in both humans and animals. These results raise the possibility that DCS may increase the benefits associated with the receipt of cognitive remediation among individuals with bipolar disorder. To date, we are unaware of any study which has examined whether concurrent receipt of DCS may increase the benefits produced by cognitive remediation among individuals with a severe mental illness.

Thus, we propose to complete an exploratory investigation of augmenting cognitive remediation with DCS among individuals with bipolar disorder. Approximately forty subjects will be randomized to one of two study arms: \[i\] CR + DCS; or \[ii\] CR + placebo. The primary outcome of interest will be changes in cognitive functioning before and after receipt of the cognitive remediation intervention. Secondary outcomes of interest will be changes in symptomatology, social and vocational functioning, and performance of tasks of everyday living.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 30

Inclusion Criteria

[i] Diagnosis of Bipolar I or Bipolar II Disorder determined by the Structured Clinical Interview for the Diagnostic and Statistical Manual of Mental Disorders (DSM) [ii] Ages 18-65 [iii] No evidence of mental retardation, dementia, or other organic disorder that may reduce cognitive functioning [iv] premorbid intelligence quotient (IQ) greater than or equal to 70 as determined by reading subtest of the Wide Range Achievement Test.

[v] Able to provide informed consent as evidenced by passing the informed consent quiz with a score of 80% or greater.

[vi] Fluent in English as assessed per self-report from participant [vii] Female subjects cannot be pregnant or breastfeeding. All subjects must consent to using at least one form of birth control during study participation.

[viii] Current remission of depressive symptoms as indicated by a score of 8 or less on the Bipolar Depression Rating Scale.

[ix] Current remission of manic symptoms as indicated by a score of 7 or less on the Young Mania Scale

Exclusion criteria:

[i] Hypersensitivity to previous receipt of cycloserine per subject report [ii] Epilespy or history of seizures as assessed using the Medical History form [iii] Meets DSM-IV criteria for alcohol or drug abuse in the past month or dependence in the past three months.

[iv] Active suicidal or homicidal ideation [v] Initiation or increase in dosage of any antidepressant within six weeks, or mood stabilizer within four weeks as assessed using the Medication Checklist.

[vi] Previous or current participation in cognitive remediation per subject report [vii] Currently taking d-cycloserine [viii] Reduced kidney or liver functioning, vitamin B12 deficiency, folic acid deficiency, megaloblastic anemia, or sideroblastic anemia per baseline safety labs.

[ix] Currently taking medication known to have problematic interactions with d-cycloserine, including etionamide and isoniazid.

[x] History of the blood disease porphyria as assessed using the Medical History form [xi] Current active symptoms of psychosis defined as not meeting existing guidelines [12] for remission of psychotic symptoms using the Positive and Negative Syndrome Scale.

Exclusion Criteria

Not provided

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
CR + placebo	CR + placebo	Cognitive Remediation and placebo
CR + DCS	CR + DCS (D-cycloserine)	Subjects will receive Cognitive Remediation and active study drug.

Primary Outcome Measures

Name	Time	Method
Change From Baseline in Cognitive Functioning	26 weeks	Level of cognitive functioning will be assessed via overall cognitive composite score from the Measurement and Treatment Research to Improve Cognition in Schizophrenia (MATRICS) Consensus Cognitive Battery. Scores on the MATRICS are presented at T-scores with a mean of 50 and standard deviation of 10 as compared to a normative sample. The possible range of scores are 0-100. Higher scores are indicative of better cognitive functioning. Change from baseline in cognitive functioning was calculated by taking the MATRICS overall cognitive functioning score at 26-week follow-up and subtracting the MATRICS overall cognitive composite score from baseline. Positive values on this score are indicative of improvements in cognitive functioning from baseline. Missing values on the MATRICS were addressed using multiple imputation

Secondary Outcome Measures

Name	Time	Method
Change From Baseline in Manic Symptomatology	26 weeks	Manic symptomatology assesed using the Yung Mania Scale. Total scores on this scale range from 0 to 60 with higher scores indicative of greater severity of manic symptoms. Change scores from baseline were calculated by subtracting baseline total scores on this measure from 26-week scores. For this change score, positive values indicate that manic symptom severity was worse at 26-week follow-up than at baseline
Change From Baseline in Social Functioning	26 Weeks	Social functioning assessed using the Social Functioning Scale. Total score calculated by converting all subscale scores to a standard score with mean = 100 and standard deviation = 15. These subscale scores are then averaged to calculate the total score. There is no set minimum or maximum on this scale given this scoring procedure. Change from baseline in social functioning was calculated by subtracting total scores at baseline assessment from total scores at 26-week. A positive value on this change score are indicative of better social functioning at 26-week assessment than at baseline.
Change From Baseline in Functional Capacity	26 Weeks	Functional capacity assessed using the Brief University of California, San Diego Performance-Based Skills Assessment (UPSA). Scores range from 0-100 with higher scores indicative of greater functional capacity. Change score were calculated by subtracting baseline scores on the UPSA from scores from the 6-month assessment. Positive values are indicative of higher functional capacity at 26-week follow-up as compared to baseline assessment.
Change From Baseline in Depressive Symptomatology	26 Weeks	Depressive symptomatology assessed using the Inventory of Depressive Symptomatology (Clinician-Rated). Total scores on this measure range from 0-84 with higher scores indicative of worse depressive symptomatology. Change from baseline in depressive symptomatology was calculated by subtracting baseline scores on the Inventory of Depressive Symptomatology from 26-week scores on this measure. Positive values of this change score indicate that depressive symptoms were worse at 26-week assessment than at baseline assessment.