Modafinil for Treatment of Cognitive Dysfunction in Schizophrenia

This study has been completed.
Sponsor:
Information provided by (Responsible Party):
Michael Minzenberg, MD, University of California, Davis
ClinicalTrials.gov Identifier:
NCT00423943
First received: January 16, 2007
Last updated: December 13, 2012
Last verified: December 2012
  Purpose

Patients with schizophrenia have problems in thinking, known as cognitive dysfunction. This appears to be responsible for their difficulties in social and occupational functioning. One particular cognitive function that may be important for schizophrenia is called context processing. This refers to the ability to properly use information in the environment to guide thinking and behavior so that it is appropriate to the present circumstance. Problems with this function may explain why patients with schizophrenia think and act in unusual ways, and often have problems managing aspects of their lives that healthy adults take for granted. This cognitive function depends on a region of the brain called the prefrontal cortex, which shows impaired function in schizophrenia as well. Unfortunately, the biochemical aspects of this dysfunction are presently unknown, and it is not clear whether current psychiatric medications can improve this function. A recent FDA-approved medication that may improve this function is modafinil. Studies in animals and healthy adults show that this medication can improve cognitive functions which are related to context processing. We plan to study the effects of modafinil on context processing and the brain activity that underlies this function. We will use functional MRI and electrophysiology to examine the effects of modafinil, both after a single dose and after sustained (4 week) treatment. We predict that when patients receive modafinil they will perform better on cognitive tests and have improved activity in the regions of the brain that are responsible for these cognitive processes.


Condition Intervention Phase
Schizophrenia
Schizoaffective Disorder
Drug: modafinil
Phase 4

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Pharmacodynamics Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Modafinil for Treatment of Cognitive Dysfunction in Schizophrenia

Resource links provided by NLM:


Further study details as provided by University of California, Davis:

Primary Outcome Measures:
  • Cognitive task performance after single-dose and after 4-week treatment [ Time Frame: 4 weeks ] [ Designated as safety issue: No ]
  • BOLD signal change by fMRI after single-dose and after 4-week treatment [ Time Frame: 4 weeks ] [ Designated as safety issue: No ]
  • Power in Gamma frequency range by scalp electrophysiology after single-dose and after 4-week treatment [ Time Frame: 4 weeks ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • Positive Symptoms on Schedule for Positive Symptoms [ Time Frame: 4 weeks ] [ Designated as safety issue: No ]
  • Negative Symptoms on Schedule for Negative Symptoms [ Time Frame: 4 weeks ] [ Designated as safety issue: No ]

Enrollment: 38
Study Start Date: September 2005
Study Completion Date: December 2012
Primary Completion Date: December 2012 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: D
modafinil
Drug: modafinil
200 milligrams daily dose
Other Name: Provigil

Detailed Description:

Schizophrenia is a disorder of cognition. The cognitive deficits of schizophrenia are present at the onset of the disorder, prior to medication exposure, are persistent during periods of remission, and are strongly related to functional outcome. These deficits prominently include prefrontal-dependent functions. While existing medications effectively treat psychotic symptoms, they exhibit modest benefit at best for cognitive dysfunction. Studies of cognition in animal models indicate that the neurotransmitter systems that mediate prefrontal-dependent cognitive processes are not generally augmented by existing antipsychotic medications. Therefore, advances in the treatment of schizophrenia will require the study of agents with novel pharmacological profiles to establish their potential to remediate cognitive dysfunction.

Advances in understanding the mechanism of action of these agents will also require the integration of pharmacology with a sophisticated methodology for testing cognition. This goal has been strongly pursued in recent years with the use of functional magnetic resonance imaging (fMRI) to study pharmacological effects on cognition. fMRI studies have identified the cortical network subserving cognitive control and working memory, which are consistently impaired among schizophrenia patients. The study of medication effects on these processes with fMRI (pharmaco-fMRI) will permit the more precise delineation of the cognitive mechanisms amenable to pharmacological intervention.

This study will use fMRI to study the effects of modafinil on the functional neuroanatomy underlying prefrontal cognitive processes. Modafinil is an FDA-approved medication with a unique pharmacological profile and an increasing range of off-label indications. Its neurochemical effects in animal models include elevation of extracellular dopamine (DA), noradrenaline (NA) and glutamate in the neocortex. This profile is favorable for the enhancement of prefrontal cognitive processes. These neurochemical effects also appear to be selective for cortical versus subcortical brain regions, suggesting that modafinil may have minimal effects on psychotic symptoms, or extrapyramidal, autonomic and hormonal side effects. In addition, it differs from amphetamine in structure, neurochemical profile and behavioral effects, with a lower risk of addictive or cerebrovascular effects. Recent studies in animal models, healthy adults and adults with psychiatric and neurological disorders indicate that modafinil improves prefrontal cognitive functions. This suggests that modafinil is a leading candidate for the treatment of cognitive dysfunction in schizophrenia. We aim to test modafinil effects on these processes in healthy adults, in order to evaluate modafinil effects on normal-range cognition, and then evaluate the remediation of deficits in these functions in individuals with schizophrenia, both in a single-dose trial and followed by a trial of sustained treatment.

Comparison 1. The effect in healthy adults and adults with schizophrenia/schizoaffective disorder, of Modafinil 200 milligrams single oral dose versus placebo (double-blind, balanced crossover design), on cognitive control task performance, and on activity of dorsolateral prefrontal cortical (DLPFC) during context processing, and anterior cingulate cortex (ACC) during conflict monitoring phases of the task, both measured by fMRI.

Comparison 2. The effect in adults with schizophrenia/schizoaffective disorder, of 4-week randomized, double-blind treatment with Modafinil 200 milligrams daily versus placebo, on cognitive control task performance, and on activity of dorsolateral prefrontal cortical (DLPFC) during context processing, and anterior cingulate cortex (ACC) during conflict monitoring phases of the task, both measured by fMRI.

  Eligibility

Ages Eligible for Study:   18 Years to 54 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

  • adults age 18-54
  • diagnosis of schizophrenia or schizoaffective disorder, or healthy with no personal or family history of mental illness
  • able to provide informed consent

Exclusion Criteria:

  • history of significant head injury or other neurological illness
  • active psychiatric illness requiring significant acute care
  • significant intellectual impairment (e.g. standardized full-scale IQ < 70)
  • history of medical illness or treatment that either interferes with experimental measures (e.g. cerebrovascular disease, anemias, etc.) or is associated with significant increase in risk from modafinil treatment (e.g. cardiac disease)
  • significant active substance abuse
  • presence of ferromagnetic foreign body or prosthesis
  • active pregnancy
  • active treatment with medications that have drug interactions with modafinil
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00423943

Locations
United States, California
University of California Davis School of Medicine
Sacramento, California, United States, 95817
Sponsors and Collaborators
University of California, Davis
Investigators
Principal Investigator: Michael J Minzenberg, MD University of California Davis School of Medicine
Principal Investigator: Cameron S Carter, MD University of California Davis School of Medicine
  More Information

No publications provided

Responsible Party: Michael Minzenberg, MD, Principal Investigator, University of California, Davis
ClinicalTrials.gov Identifier: NCT00423943     History of Changes
Other Study ID Numbers: 200513585-1
Study First Received: January 16, 2007
Last Updated: December 13, 2012
Health Authority: United States: Institutional Review Board

Keywords provided by University of California, Davis:
cognition
memory

Additional relevant MeSH terms:
Schizophrenia
Psychotic Disorders
Cognition Disorders
Schizophrenia and Disorders with Psychotic Features
Mental Disorders
Delirium, Dementia, Amnestic, Cognitive Disorders
Modafinil
Armodafinil
Wakefulness-Promoting Agents
Central Nervous System Stimulants
Central Nervous System Agents
Therapeutic Uses
Pharmacologic Actions
Physiological Effects of Drugs

ClinicalTrials.gov processed this record on September 30, 2014