Proposal To Develop A Rapid And Cost-Effective Diagnostic Test For Schizophrenia
Overview
- Phase
- Phase 1
- Intervention
- Ziprasidone
- Conditions
- Schizophrenia
- Sponsor
- University of Arizona
- Enrollment
- 24
- Locations
- 1
- Primary Endpoint
- Pulse Rate
- Status
- Recruiting
- Last Updated
- 11 months ago
Overview
Brief Summary
Schizophrenia is a severe psychotic illness of unknown cause that affects 1% of the population worldwide. Currently, there is no diagnostic test for schizophrenia. Instead, the diagnosis is typically established through a psychiatric interview of the patient, who is evaluated against a set of established criteria of signs and symptoms. It can take many months to years to establish a diagnosis of schizophrenia and achieve an appropriate treatment regimen to attain resolution of the patient's symptoms. This process is particularly challenging in areas of limited access to specialists a problem not only in third world countries and rural regions, but throughout the United States where there can be long waits to obtain an appointment with a psychiatrist. The present research experiment investigates a potential novel method for diagnosing schizophrenia.
The overall objective of the study is to test the hypothesis that patients with schizophrenia will have a heightened tolerance to the sedating effects of anti-psychotic medications, which will be reflected in differences in their electroencephalogram (EEG) when compared to healthy normal controls. The investigators expect that the schizophrenia patients will score on the "more alert" and "less sleepy" ends of these scales, and that the normal control subjects will show the opposite response. A patient that fails to become sedated or experience the sleepiness side effects, typically caused by the anti-psychotic medication, may support the existing diagnosis of schizophrenia. Measures of the subjects' level of sedation that are found to correlate significantly with EEG response and diagnosis will be used to create a diagnostic test. This simple and inexpensive test will consist of a single dosage of anti-psychotic medication, and a rapid assessment tool with scores that have a high degree of predictive validity for the diagnosis of schizophrenia.
Detailed Description
The overall objective of the study is to test the hypothesis that patients with schizophrenia will have a heightened tolerance to the sedating effects of antipsychotic medications, which will be reflected in differences in the participants' electroencephalogram response (EEG), when compared to healthy control participants.The following Specific Aims are designed to test this hypothesis and create the diagnostic tool. Specific Aim 1: The investigators will first conduct a pilot dose-response evaluation of the anti-psychotic drugs ziprasidone (Geodon) (20, 40, or 60 mg tablet) and olanzapine (Zyprexa®) (2.5, 5, 7.5, or 10 mg tablet) in non-psychiatric ill control participants to determine the optimal dosage that promotes sedation in healthy participants versus a placebo. The evaluation will comprise a physical examination and questionnaires. The investigators will start with the lowest dose of each drug and if the dosage fails to induce sedation in healthy participants, the investigators will repeat the pilot dose-response evaluation with the next higher dose until the maximum dose is reached for both drugs. Specific Aim 2. To determine whether the pattern of EEG activity in response to a single dose of the anti-psychotic medication determined from the dose-response study from Aim 1 distinguishes schizophrenia participants from normal controls. The investigators will start with 2-4 healthy control participants to determine that the results show a discernible effect on the EEG using the dosage from Aim 1. If the dose of anti-psychotic medication fails to show an effect on the EEG the investigators will increase the dosage until the maximum dosage of the chosen medication is used. Once the dosage is identified the investigators will move onto getting IRB approval to evaluate participants diagnosed with schizophrenia.
Investigators
Eligibility Criteria
Inclusion Criteria
- Not provided
Exclusion Criteria
- Not provided
Arms & Interventions
Ziprasidone
The investigators will conduct a pilot dose-response evaluation of a single dose of the anti-psychotic drug ziprasidone (Geodon). The investigators will start with a single 20mg pill given to (3) subjects and will increase the dosage in sequential subjects until the desired sedation effect is achieved (i.e. 40 and 60mg tablets). If Ziprasidone causes the desired sedation effect additional healthy subjects will be recruited to take the medication and have an electroencephalogram (EEG) taken.
Intervention: Ziprasidone
Ziprasidone
The investigators will conduct a pilot dose-response evaluation of a single dose of the anti-psychotic drug ziprasidone (Geodon). The investigators will start with a single 20mg pill given to (3) subjects and will increase the dosage in sequential subjects until the desired sedation effect is achieved (i.e. 40 and 60mg tablets). If Ziprasidone causes the desired sedation effect additional healthy subjects will be recruited to take the medication and have an electroencephalogram (EEG) taken.
Intervention: Olanzapine
Ziprasidone
The investigators will conduct a pilot dose-response evaluation of a single dose of the anti-psychotic drug ziprasidone (Geodon). The investigators will start with a single 20mg pill given to (3) subjects and will increase the dosage in sequential subjects until the desired sedation effect is achieved (i.e. 40 and 60mg tablets). If Ziprasidone causes the desired sedation effect additional healthy subjects will be recruited to take the medication and have an electroencephalogram (EEG) taken.
Intervention: Placebo Comparator
Olanzapine
The investigators will conduct a pilot dose-response evaluation of a single dose of the anti-psychotic drug olanzapine (Zyprexa). The investigators will start with a single 2.5 mg pill given to (3) subjects and will increase the dosage in sequential subjects until the desired sedation effect is achieved (i.e. 5, 7.5, and 10 mg tablets).If olanzapine causes the desired sedation effect additional healthy subjects will be recruited to take the medication and have an electroencephalogram (EEG).
Intervention: Olanzapine
Olanzapine
The investigators will conduct a pilot dose-response evaluation of a single dose of the anti-psychotic drug olanzapine (Zyprexa). The investigators will start with a single 2.5 mg pill given to (3) subjects and will increase the dosage in sequential subjects until the desired sedation effect is achieved (i.e. 5, 7.5, and 10 mg tablets).If olanzapine causes the desired sedation effect additional healthy subjects will be recruited to take the medication and have an electroencephalogram (EEG).
Intervention: Placebo Comparator
Placebo Comparator
The investigators have prepared a placebo which duplicates the exact color and size of the study drug capsule to use as a non-drug control.
Intervention: Ziprasidone
Placebo Comparator
The investigators have prepared a placebo which duplicates the exact color and size of the study drug capsule to use as a non-drug control.
Intervention: Placebo Comparator
Outcomes
Primary Outcomes
Pulse Rate
Time Frame: up to 2 years
Evaluating the pulse rate of the subject every hour during all the test procedures
Hand Fatigue Scale
Time Frame: up to 2 years
A hand grip measuring device will be used to test for fatigue. A small hand held device will measure the participants hand grip strength every hour during the test and at baseline.
Heart Rate
Time Frame: up to 2 years
Evaluating the heart rate of the subject every hour during all the test procedures
Epworth Sleepiness Scale
Time Frame: up to 2 years
The subject will rate their pre-test sleepiness only once during the test using a (4) point scale (0= no chance of dosing, 1= slight chance of dosing, 2= moderate chance of dozing and 3= high chance of dozing
Fatigue Severity Scale
Time Frame: up to 2 years
The subject will rate their pre-test fatigue only once during the test by rating 10 questions using a slide scale between 1 and 7. A rating of 1 means the subject strongly disagrees with the statement. A rating of 7 means the subject strongly agrees with the statement.
Chalder Fatigue Scale
Time Frame: up to 2 years
Subjects will rate their fatigue every hour and at baseline by answering 11 questions and rating their fatigue using a 4 point scale (i.e. less than usual, no more than usual, more than usual and much more than usual)
Psychomotor physical computerized test
Time Frame: up to 2 years
The participants uses a computerized test to test their reflexes every hour and at baseline during the trial period. Every time a red dot appears in the middle of the screen the participant must touch the computer screen as fast as they can. This test was measured in how fast they responded (ms) and by how many attempts to touch the screen were recorded in 2 minutes
Electroencephalogram
Time Frame: up to 2 years
Electroencephalogram will be taken at baseline and after subjects have taken the anti-psychotic medication. There will be no placebo taken for this test.
Stanford Sleepiness Scale
Time Frame: up to 2 years
The subject will rate how sleepy they are feeling at baseline and every hour during the test using an (8) point scale (i.e. 1= feeling active, vital alert, or wide awake; 2= functioning at high levels, but not fully alert; 3= awake, but relaxed, responsive but not fully alert; 4= somewhat foggy, let down; 5= foggy, losing interest in remaining awake, slowed down; 6= sleepy, woozy, fighting sleep, prefer to lay down; 7= no longer fighting sleep, sleep onset soon, having dream-like thoughts; 8= asleep