Sodium Oxybate in Schizophrenia With Insomnia
Insomnia Related to Schizophrenia (307.42)
Drug: Sodium Oxybate
|Study Design:||Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
|Official Title:||Open Label, Pilot Study of Adjunctive Xyrem (Sodium Oxybate) for the Treatment of Schizophrenia and Associated Sleep Disturbances|
- Pittsburgh Sleep Quality Index [ Time Frame: 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 [ Time Frame: 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.
- Positive and Negative Syndrome Scale (PANSS) Negative Factor [ Time Frame: 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 [ Time Frame: 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 [ Time Frame: 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.
|Study Start Date:||May 2008|
|Study Completion Date:||April 2009|
|Primary Completion Date:||April 2009 (Final data collection date for primary outcome measure)|
Experimental: Sodium oxybate
Drug: Sodium 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.
Other Name: Xyrem
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:
- requirement of cumbersome dosing patterns (up to six times a day) that could have led to incomplete compliance,
- lack of objective measures of subjective sleep or sleep architecture,
- lack of objective cognitive testing,
- use of GHB as monotherapy or only in conjunction with only low dose antipsychotics,
- short trial duration (less than 4 weeks),
- relatively low overall night-time dose of GHB, and
- 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.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00594256
|United States, New York|
|Nathan Kline Insitute for Psychiatric Research|
|Orangeburg, New York, United States, 10962|
|Principal Investigator:||Daniel C Javitt, MD PhD||Nathan Kline Institute for Psychiatric Research|