Insomnia Related to Schizophrenia (307.42), Schizophrenia
Conditions
Keywords
Schizophrenia, Sleep Architecture, Sodium Oxybate, Insomnia, Cognition
Brief summary
The present protocol proposes study of the recently approved compound sodium oxybate (Xyrem), a gamma-aminobutyric acid type b (GABAB) and a g-hydroxybutyric acid (GHB) receptor agonist, for the study of persistent symptoms of schizophrenia. Sodium oxybate is a central nervous system depressant currently approved for treatment of narcolepsy associated with cataplexy and excessive daytime sleepiness. In addition to evaluating effects on sodium oxybate on persistent symptoms and neurocognitive deficits in schizophrenia, the study will test the hypothesis that this medication may be particularly effective in combating Insomnia Related to Schizophrenia, and in normalizing symptomatic and polysomnographic manifestations of sleep-related brain dysfunction in schizophrenia.
Detailed description
Rationale/Study Hypothesis: Rationale for study of sodium oxybate is twofold: first, sleep dysfunction is an important and overlooked aspect of schizophrenia intrinsically linked to cognitive and functional impairments, and, second, GABAB receptors regulate dopaminergic and glutamatergic systems in vivo, suggesting that GABAB agonists may be therapeutically beneficial in schizophrenia. We are aware of three previous trials of GHB in schizophrenia, two of which did not show any overall benefit in psychopathology. We noted multiple limitations in the controlled trials, including: 1. requirement of cumbersome dosing patterns (up to six times a day) that could have led to incomplete compliance, 2. lack of objective measures of subjective sleep or sleep architecture, 3. lack of objective cognitive testing, 4. use of GHB as monotherapy or only in conjunction with only low dose antipsychotics, 5. short trial duration (less than 4 weeks), 6. relatively low overall night-time dose of GHB, and 7. a heterogeneous, small sample. We propose an open label, proof of concept study evaluating the effect of sodium oxybate on insomnia in schizophrenia. The primary hypothesis of the study is that patients treated with sodium oxybate will show improved subjective sleep as measured by the overall Epworth Sleepiness Scale and the Pittsburgh Sleep Quality Index. Secondarily, we expect superior reduction in total psychopathology and PANSS factor scales (PANSS), polysomnographic measures, and neurocognition (MATRICS). Design and dosage schedule: We plan to enroll eight hospitalized patients with diagnostic & statistical manual text revision (DSM-IV-TR) schizophrenia and insomnia related to schizophrenia. The study will include: a one-week evaluation period, which will include tapering of any hypnotics, baseline diagnostic, psychopathology, neurocognitive, electrophysiological and polysomnographic measurements. Patients will then begin a four-week trial of adjunctive sodium oxybate, with a three-week taper of sodium oxybate to follow. Hypnotic/sodium oxybate taper may be extended or abbreviated, depending on clinical judgment. Patients entering the study will be permitted to receive both typical and atypical antipsychotics. Treating psychiatrists will be encouraged to maintain fixed doses of all psychotropic medication throughout the study. Other than haloperidol and benztropine prn (up to 10 mg/day of haloperidol), the prescription of a new psychotropic will not be permitted. After the second week of study medication, any subject requiring more than 4 doses of haloperidol in one week will be considered to have relapsed, and will be withdrawn from the study.
Interventions
DRUGSodium Oxybate
Patients will undergo a one-week evaluation period, which will include a taper and discontinuation of any currently prescribed sedative/hypnotics, as well as baseline diagnostic, psychopathology, neurocognitive and polysomnographic measurements (see below for details). Hypnotic taper may be extended or abbreviated, depending on clinical judgment. Patients will then begin a 4-week trial of adjunctive Xyrem (sodium oxybate). Patients will begin at 4.5 g/night (in divided doses of 2.25 g, with 1st dose at bedtime and then 2nd dose four hours later). Dosage will increase by 1.5 g/day every week, until a dose of 9 g nightly is reached, or a patient cannot tolerate further dose escalations. Medication will be administered in divided dosage for the duration of the study. A three-week taper (by 3 g/day weekly) of sodium oxybate will follow the four-week trial of sodium oxybate.
Sponsors
Jazz Pharmaceuticals
Nathan Kline Institute for Psychiatric Research
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to 45 Years
Healthy volunteers
No
Inclusion criteria
* Patients aged 18-45 with a DSM-IV diagnosis of schizophrenia and insomnia related to schizophrenia, confirmed by a structured interview (SCID).
Exclusion criteria
* Lack of capacity to give informed consent (capacity is determined by a licensed member of the treatment team). * Unstable medical illness. * Diagnosis of restless leg syndrome, a seizure disorder, uncontrolled hypertension, unstable cardiac illness, or obstructive sleep apnea. * Pregnancy or lack of adequate birth control. * History of substance dependence disorder. * Current treatment with valproic acid. * Succinic semialdehyde dehydrogenase deficiency (SSADH). * Persistent need for treatment with benzodiazepines, barbiturates, opiates or other sedative hypnotics.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Pittsburgh Sleep Quality Index | 1 month | This rating scale generates a global sleep-quality score, as well as scores on 7 components of sleep quality: subjective sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbances, use of sleeping medication, and daytime dysfunction. The 19 items are combined to form seven component scores, each of which has a range of O-3 points. The seven component scores are then added to yield one global score, with a range of O-21 points, 0 indicating no difficulty and 21 indicating severe difficulties in all areas. |
| Epworth Sleepiness Scale | 1 month | Designed to measure daytime sleepiness. 8 items rated 0-3, with higher scores associated with a greater daytime sleepiness. overall score rated 0-24, with scores greater than 10 indicating significant daytime sleepiness. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Positive and Negative Syndrome Scale (PANSS) Negative Factor | 1 month | The PANSS Negative factor is a 7-item rating scale widely used in the assessment of schizophrenia. Range is 7-49 with higher scores worse |
| MATRICS Neurocognitive Battery Composite | 1 month | This is a series of neurocognitive tests developed by the National Institute of Mental Health to evaluate medications targeting cognition in an efficient and reliable manner. It will be modified by the deletion of the social competence domain. The six domains include speed of processing, attention/vigilance, working memory, verbal learning, visual learning and reasoning/problem solving. The primary outcome will be the mean T-score (mean of six domains). |
| Slow Wave Sleep Minutes | 1 month | Overnight sleep study: Subjects will undergo polysomnography four times during this study, on consecutive nights during the observation week and on consecutive nights at the end. Polysomnography will be performed in a modified seclusion room on the in patient unit. The first of the consecutive nights will be used for adaptation to the study conditions. Sleep was recorded between lights off (10 pm) and lights on (at 6:45 am). We aim for conditions for falling asleep as comfortable as possible under the experimental condition. |
Countries
United States
Participant flow
Recruitment details
Rockland Psychiatric Center
Participants by arm
| Arm | Count |
|---|---|
| Sodium Oxybate (Open Label) open label sodium oxybate treatment, beginning at 4.5 g/night and increasing weekly to a final dose of 9 g/night. Given in divided dose, half at bedtime and half 4 hours later (subjects were woken up) | 8 |
| Total | 8 |
Baseline characteristics
| Characteristic | Sodium Oxybate (Open Label) |
|---|---|
| Age, Categorical <=18 years | 0 Participants |
| Age, Categorical >=65 years | 0 Participants |
| Age, Categorical Between 18 and 65 years | 8 Participants |
| Age, Continuous | 41.8 years STANDARD_DEVIATION 10 |
| Region of Enrollment United States | 8 participants |
| Sex: Female, Male Female | 1 Participants |
| Sex: Female, Male Male | 7 Participants |
Adverse events
| Event type | EG000 affected / at risk |
|---|---|
| deaths Total, all-cause mortality | — / — |
| other Total, other adverse events | 5 / 8 |
| serious Total, serious adverse events | 0 / 8 |
Outcome results
Primary
Epworth Sleepiness Scale
Designed to measure daytime sleepiness. 8 items rated 0-3, with higher scores associated with a greater daytime sleepiness. overall score rated 0-24, with scores greater than 10 indicating significant daytime sleepiness.
Time frame: 1 month
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Sodium Oxybate | Epworth Sleepiness Scale | 4.8 global score | Standard Deviation 4.6 |
Comparison: Open label baseline final paired t testp-value: 0.02t-test, 2 sided
Primary
Pittsburgh Sleep Quality Index
This rating scale generates a global sleep-quality score, as well as scores on 7 components of sleep quality: subjective sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbances, use of sleeping medication, and daytime dysfunction. The 19 items are combined to form seven component scores, each of which has a range of O-3 points. The seven component scores are then added to yield one global score, with a range of O-21 points, 0 indicating no difficulty and 21 indicating severe difficulties in all areas.
Time frame: 1 month
Population: ITT
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Sodium Oxybate | Pittsburgh Sleep Quality Index | 6.1 global score | Standard Deviation 3.7 |
Comparison: Open label baseline final paired t testp-value: =0.002t-test, 2 sided
Secondary
MATRICS Neurocognitive Battery Composite
This is a series of neurocognitive tests developed by the National Institute of Mental Health to evaluate medications targeting cognition in an efficient and reliable manner. It will be modified by the deletion of the social competence domain. The six domains include speed of processing, attention/vigilance, working memory, verbal learning, visual learning and reasoning/problem solving. The primary outcome will be the mean T-score (mean of six domains).
Time frame: 1 month
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Sodium Oxybate | MATRICS Neurocognitive Battery Composite | -.26 Composite T-score | Standard Deviation 3.8 |
Comparison: Open label baseline final paired t testp-value: 0.8t-test, 2 sided
Secondary
Positive and Negative Syndrome Scale (PANSS) Negative Factor
The PANSS Negative factor is a 7-item rating scale widely used in the assessment of schizophrenia. Range is 7-49 with higher scores worse
Time frame: 1 month
Population: Paired t test of baseline and final values
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Sodium Oxybate | Positive and Negative Syndrome Scale (PANSS) Negative Factor | 2.8 mean decrease in negative subscale | Standard Deviation 3.2 |
Comparison: Open label baseline final paired t testp-value: 0.04t-test, 2 sided
Secondary
Slow Wave Sleep Minutes
Overnight sleep study: Subjects will undergo polysomnography four times during this study, on consecutive nights during the observation week and on consecutive nights at the end. Polysomnography will be performed in a modified seclusion room on the in patient unit. The first of the consecutive nights will be used for adaptation to the study conditions. Sleep was recorded between lights off (10 pm) and lights on (at 6:45 am). We aim for conditions for falling asleep as comfortable as possible under the experimental condition.
Time frame: 1 month
Population: 4 pre post
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Sodium Oxybate | Slow Wave Sleep Minutes | 34.1 minutes | Standard Deviation 26 |
Comparison: Open label baseline final paired t testp-value: <0.01t-test, 1 sided