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Schizophrenia Sensory Gating Deficit With Quetiapine

This study has been completed.
Information provided by:
New Mexico VA Healthcare System Identifier:
First received: September 27, 2007
Last updated: December 20, 2007
Last verified: September 2007
The purpose of this study is the use of magnetoencephalography or MEG (a machine that measures magnetic activity in your brain) and electroencephalography or EEG (a technique that measures electrical activity in your brain) to study how sounds are processed in individuals with schizophrenia after three months of taking the antipsychotic medication quetiapine.

Condition Intervention
Drug: Quetiapine

Study Type: Observational
Study Design: Time Perspective: Prospective
Official Title: Schizophrenia Sensory Gating Deficit With Quetiapine

Resource links provided by NLM:

Further study details as provided by New Mexico VA Healthcare System:

Estimated Enrollment: 20
Study Start Date: April 2004
Study Completion Date: March 2006
Detailed Description:
.Problems with attention and perception are core features of schizophrenia and are hypothesized to result from defects in the filtering or gating of sensory input. Examination of this requires neuoimaging techniques with high temporal resolution. High-density EEG and MEG in combination with structural magnetic resonance imaging (sMRI) are used to map sensory gating. In a number of recent studies patient treated with novel antipsychotics have been shown to have P50 gating ratios resembling those of normal controls rather than that of schizophrenia subjects treatment with conventional antipsychotics. To date, there is no literature on the effects of quetiapine on sensory gating. Subjects who meet all inclusion criteria and have been on a stable dose of quetiapine for three months will receive a clinical interview, an MRI, MEG, and neuropsychological testing to determine if patients with schizophrenia who are treated with quetiapine will demonstrate a sensory gating ratio similar to normal controls, indicating no deficit in sensory gating.

Ages Eligible for Study:   18 Years to 18 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

Patient Population

  • Diagnosis of Schizophrenia as determine by the Structured Clinical Interview for DSM-IV
  • No comorbid diagnosis of PTSD
  • responders to quetiapine, determined by continuous treatment at the same dose of quetiapine and absence of psychiatric hospitalization for at least 3 months
  • No history of drug dependency in their lifetime
  • No history of alcohol or other substance abuse in the 6 months prior to entry into the study
  • No history of head injury with loss of consciousness for more than 5 minutes
  • No history of seizure disorder
  • No mood stabilizing agents
  • Between 18-65 and
  • Able to sign informed consent

Normal Controls

  • Matched in age and gender to patient population
  • No history of psychiatric dysfunction or alcohol or other substance dependence in their lifetime as determine by the SCID
  • No history of alcohol or other substance abuse in the previous 6 months
  • No family history of psychotic disorder in first degree relatives as assessed by the FH-RDC diagnostic interview
  • No history of head injury with loss of consciousness for more than 5 minutes
  • No history of seizure disorder
  • Between 18-65
  • Able to sign informed consent

Exclusion Criteria:

Subjects will be excluded from participating in this study if they:

  • Require treatment with a mood stabilizer
  • Have had an inpatient hospitalization in the past 3 months
  • Have a history of a neurological disorder
  • Have any other axis I diagnosis besides schizophrenia
  Contacts and Locations
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Please refer to this study by its identifier: NCT00536783

United States, New Mexico
New Mexico VA Healthcare System
Albuquerque, New Mexico, United States, 87108
Sponsors and Collaborators
New Mexico VA Healthcare System
Principal Investigator: Jose M Canive, MD New Mexico VA Heathcare System / BRINM
  More Information

Additional Information: Identifier: NCT00536783     History of Changes
Other Study ID Numbers: 0072
Study First Received: September 27, 2007
Last Updated: December 20, 2007

Keywords provided by New Mexico VA Healthcare System:
Clinical Trial
Open Label
Sensory Gating

Additional relevant MeSH terms:
Schizophrenia Spectrum and Other Psychotic Disorders
Mental Disorders
Quetiapine Fumarate
Antipsychotic Agents
Tranquilizing Agents
Central Nervous System Depressants
Physiological Effects of Drugs
Psychotropic Drugs processed this record on April 28, 2017