gamma-aminobutyric acid and Disorders of Excessive Somnolence

gamma-aminobutyric acid has been researched along with Disorders of Excessive Somnolence in 22 studies

gamma-Aminobutyric Acid: The most common inhibitory neurotransmitter in the central nervous system.
gamma-aminobutyric acid : A gamma-amino acid that is butanoic acid with the amino substituent located at C-4.

Disorders of Excessive Somnolence: Disorders characterized by hypersomnolence during normal waking hours that may impair cognitive functioning. Subtypes include primary hypersomnia disorders (e.g., IDIOPATHIC HYPERSOMNOLENCE; NARCOLEPSY; and KLEINE-LEVIN SYNDROME) and secondary hypersomnia disorders where excessive somnolence can be attributed to a known cause (e.g., drug affect, MENTAL DISORDERS, and SLEEP APNEA SYNDROME). (From J Neurol Sci 1998 Jan 8;153(2):192-202; Thorpy, Principles and Practice of Sleep Medicine, 2nd ed, p320)

Research

Studies (22)

Authors

Clinical Trials (5)

Trial Overview

Trial Outcomes

G-ER at 1800mg Daily Compared With Placebo in Reducing the Average Daily Frequency of Moderate to Severe Hot Flashes at Week 24 of the Efficacy Treatment Period, Compared With Baseline.

G-ER dosed at 1800mg daily(600mg AM, 1200mg PM), compared with placebo in reducing the average daily frequency of moderate to severe hot flashes in post menopausal women at Week 24 of the efficacy treatment period compared with Baseline. (NCT01080300)
Timeframe: Baseline, Week 24

G-ER at 1800mg Daily Compared With Placebo in Reducing the Average Daily Severity Score of Moderate to Severe Hot Flashes at Week 24 of the Efficacy Treatment Period, Compared With Baseline.

"G-ER dosed at 1800mg daily(600mg AM, 1200mg PM), compared with placebo in reducing the average daily severity score of moderate to severe hot flashes in post menopausal women (score defined as Mild (1), Moderate (2), and Severe (3)) at Week 24 of the efficacy treatment period compared with Baseline." (NCT01080300)
Timeframe: Baseline, Week 24

Change From Baseline to Weeks 4, Week 12, and Week 24 in Average Daily Sleep Interference Score.

Sleep Interference Score Range: Minimum value = 0, maximum value = 10 Lower scores indicate better outcome (ie, less interference) (NCT01080300)
Timeframe: Baseline, Week 4, Week 12, and Week 24

Changes From Baseline in Quality of Life Scores, Measured by the Menopause-Specific Quality of Life Questionnaire (MENQOL) to Weeks, 4, 12, 24 of the Efficacy Treatment Period.

"4 sub-categories each scored individually: Minimum value = 1, maximum value = 8.~Overall summary score was mean of the 4 sub-category scores (minimum = 1 and maximum = 8).~Lower scores indicate better outcome (ie, less severity)" (NCT01080300)
Timeframe: Baseline, Week 4, Week 12, and Week 24

Changes From Baseline in Sleep Quality Scores, Measured by the Insomnia Severity Index (ISI) to Week 4, Week 12, and Week 24 of the Efficacy Treatment Period.

Insomnia Severity Index (ISI) scored on 4-point Likert-scales ('0' not at all - '4' extremely) for 7 sub-categories. Final score is sum of each sub-category generating a total sleep quality score (0-28). Minimum value = 0, maximum value = 28 (Lower scores indicate better outcome (ie, less severity)). (NCT01080300)
Timeframe: Baseline, Week 4, Week 12, and Week 24

Clinical Global Impression of Change (CGIC) Scales at Weeks 12 and 24 of the Efficacy Treatment Period.

"Proportion of patients who were categorized as very much or much improved in CGIC at Week 12 and Week 24. Scale range is 6 categories: minimum value = very much worse to maximum value = very much improved." (NCT01080300)
Timeframe: Week 12 and Week 24

G-ER at 1800mg Daily Compared With Placebo in Reducing the Average Daily Frequency of Moderate to Severe Hot Flashes at Weeks 4 & 12 of the Efficacy Treatment Period, Compared With Baseline.

G-ER dosed at 1800mg daily(600mg AM, 1200mg PM), compared with placebo in reducing the average daily frequency of moderate to severe hot flashes in post menopausal women at Week 4 of the efficacy treatment period compared with Baseline and at Week 12 of the efficacy treatment period compared with Baseline. (NCT01080300)
Timeframe: Baseline, Week 4, and Week 12

G-ER at 1800mg Daily Compared With Placebo in Reducing the Average Daily Severity Score of Moderate to Severe Hot Flashes at Weeks 4 & 12 of the Efficacy Treatment Period, Compared With Baseline.

"G-ER dosed at 1800mg daily(600mg AM, 1200mg PM), compared with placebo in reducing the average daily severity score of moderate to severe hot flashes in post menopausal women (score defined as Mild (1), Moderate (2), and Severe (3)) at Week 4 of the efficacy treatment period compared with Baseline and at Week 12 of the efficacy treatment period compared with Baseline." (NCT01080300)
Timeframe: Baseline, Week 4, and Week 12

Patient Global Impression of Change (PGIC) Scales at Weeks 12 and 24 of the Efficacy Treatment Period.

"Proportion of patients who were categorized as very much or much improved for PGIC at Week 12 and Week 24. Scale range is 6 categories: minimum value = very much worse to maximum value = very much improved." (NCT01080300)
Timeframe: Week 12 and Week 24

Percent of Patients With 75% or Greater Reduction in Average Daily Frequency of Moderate to Severe Hot Flashes

(NCT01080300)
Timeframe: Baseline, Week 12, and Week 24

Percent of Patients With 75% or Greater Reduction in Average Daily Severity Score of Moderate to Severe Hot Flashes

(NCT01080300)
Timeframe: Baseline, Week 12, and Week 24

Safety of G-ER Measuring Columbia-Suicide Severity Rating Scale (C-SSRS).

"Columbia-Suicide Severity Rating Scale (C-SSRS). Subjects were classified as 0=no suicidal ideation or 1=suicidal ideation. Outcome Measure is number of participants with or without suicidal ideation.~Higher counts without suicidal ideation = better outcome." (NCT01080300)
Timeframe: Week 4, Week 12, Week 24/Early Termination, Week 28

Epworth Sleepiness Scale

"Scores on the Epworth Sleepiness Scale (ESS) were averaged by subject across all administrations for a given drug condition (i.e. administered twice on clarithromycin (once during week 1 and once during week 2) and twice on placebo (once during week 1 and once during week 2)).~ESS scores can range from 0 to 24. Higher scores indicate higher levels of sleepiness." (NCT01146600)
Timeframe: baseline, then after 1 week and 2 weeks on each study drug

FOSQ

"Scores on the Functional Outcomes of Sleep Questionnaire (FOSQ) were averaged by subject across all administrations for a given drug condition (i.e. administered twice on clarithromycin (once during week 1 and once during week 2) and twice on placebo (once during week 1 and once during week 2)).~Scores on the FOSQ can range from 5 to 20. Higher FOSQ scores indicate less impairment due to sleepiness." (NCT01146600)
Timeframe: baseline, then after 1 week and 2 weeks on each study drug

PSQI

"Scores on the Pittsburgh Sleep Quality Index (PSQI), a questionnaire based assessment of sleep quality. Scores were averaged by subject across all administrations for a given drug condition (i.e. administered twice on clarithromycin (once during week 1 and once during week 2) and twice on placebo (once during week 1 and once during week 2)).~Scores on the PSQI can range from 0 to 21. Higher scores indicate poorer sleep quality." (NCT01146600)
Timeframe: baseline, then after 1 week and 2 weeks on each study drug

Psychomotor Vigilance Task (PVT) Reaction Time

"Median reaction time on the PVT at the end of the second week of treatment. Lower values reflect faster reaction times (I.e., greater vigilance).~Note that the PVT provides a median of reaction times to all stimuli (~100) presented during the 10 minute PVT test. Each subject had two PVT tests at each visit, resulting in two median values. These were averaged, and then, for the purposes of this outcome, we then obtained the MEAN across multiple subjects for each condition (baseline, clarithromycin week 2, placebo week 2)" (NCT01146600)
Timeframe: week 2 of each intervention

PVT Median Reaction Time at Week 1

"median reaction time on the PVT at week 1 of each intervention. Lower values reflect faster reaction times (i.e., better vigilance)~Note that the PVT provides a median of reaction times to all stimuli (~100) presented during the 10 minute PVT test. Each subject had two PVT tests at each visit, resulting in two median values. These were averaged, and then, for the purposes of this outcome, we then obtained the MEAN across multiple subjects for each condition (baseline, clarithromycin week 1, placebo week 1)" (NCT01146600)
Timeframe: week 1

PVT Number of Lapses

Number of lapses (no response for > 500 msec) on the PVT, averaged by subject across all administrations for a given drug condition (i.e. administered twice at baseline, four times on clarithromycin (twice during week 1 and twice during week 2), and four times on placebo (twice during week 1 and twice during week 2)). Higher numbers indicate worse vigilance. (NCT01146600)
Timeframe: baseline, then after 1 week and 2 weeks on each study drug

SF-36, Vitality Subscale

"The SF-36 is a health outcome scale with multiple subsections. Subjects were administered the entire SF-36; this analysis is of the vitality subscore provided by this scale. Scores were averaged by subject across all administrations for a given drug condition (i.e. administered once at baseline, twice on clarithromycin (once during week 1 and once during week 2) and twice on placebo (once during week 1 and once during week 2)).~The vitality subscore is calculated using four questions from the SF-36, and can range from 0 to 100. Higher scores reflect more vitality." (NCT01146600)
Timeframe: baseline, then after 1 week and 2 weeks on each study drug

"Number of Participants With a Score of Much Improved or Very Much Improved on the Investigator-rated CGI-I Scale (Response) at (Week 12) Using LOCF"

"The investigator -rated Clinical Global Impression of Improvement (CGI-I) scale is an assessment designed to allow investigators to rate the change of a participant's disease severity over time based on a seven-point scale, with a score of 1 being very much improved, a score of 2 being much improved, a score of 3 being minimally improved, a score of 4 being no change, a score of 5 being minimally improved,a score of 6 being much worse, and a score of 7 being very much worse. Participants with a response of much improved or very much improved were classified as responders." (NCT00365352)
Timeframe: Week 12

Change From Baseline in IRLS Rating Scale Total Score at Week 12 Using Last Observation Carried Forward (LOCF)

The International Restless Legs Syndrome (IRLS) Rating scale is a measure of RLS disease severity. The scale reflects the participant-reported assessment of primary sensory and motor features and associated sleep problems in RLS. Ten items (individually scored from 0 to 4) are included that assess the impact of symptoms on participants' mood, daily life, and activities. The total scale score is a sum of all of the individual item scores and ranges from 0-40 points, with 40 being the most severe. The scale assesses symptoms over the week prior to measurement. (NCT00365352)
Timeframe: Baseline and Week 12

Change From Baseline in Sleep Adequacy, an Item on the MOS Sleep Scale, at Week 12 Using LOCF

"The MOS Sleep Scale measures most constructs of sleep. The scale has a battery of questions to measure specific aspects of sleep in participants with co-morbidities. The four domains scored from the MOS Sleep Scale were sleep disturbance,' sleep quantity,' sleep adequacy, and daytime somnolence. The scores of the sleep adequacy domain ranged from 1 to 100, with a high score indicating greater adequacy. The assessment was completed at Baseline (Day 1) and end of Weeks, 4, 8, and 12 (or end of Treatment)." (NCT00365352)
Timeframe: Basline and Week 12

Change From Baseline in Sleep Quantity, an Item on the MOS Sleep Scale, at Week 12 Using LOCF

"The MOS Sleep Scale measures most constructs of sleep. The scale has a battery of questions to measure specific aspects of sleep in participants with co-morbidities. The four domains scored from the MOS Sleep Scale were sleep disturbance,' sleep quantity,' sleep adequacy, and daytime somnolence. The scores of the sleep quantity domain were measured in time (number of hours of sleep each night). The assessment was completed at Baseline (Day 1) and end of Weeks, 4, 8, and 12 (or end of Treatment)." (NCT00365352)
Timeframe: Baseline and Week 12

Change From Baseline in the Average Daily RLS Pain Score at the End of Treatment (Week 12) for Participants With Pain at Baseline or the End of Week 12 Using LOCF

The Daily RLS pain score was assessed by participants reporting whether they experienced any pain associated with RLS in the last 24 hours and rating their pain levels on an 11-point numerical rating scale, with 0 being no pain and 10 the most intense pain imaginable. The assessment was performed for 7 days prior to Baseline and pre-defined study visits. The change from baseline was calculated as the End of Treatment (Week 12) value minus the Baseline (Day 1) value. (NCT00365352)
Timeframe: Baseline and End of Treatment (Week 12)

Change From Baseline in the Average Daily RLS Pain Score to Week 12 for Participants With a Baseline Pain Score of at Least 4 Using LOCF

The Average Daily RLS pain was assessed by participants reporting whether they experienced any pain associated with RLS in the last 24 hours and rating their pain levels on an 11-point numerical rating scale, with 0 being no pain and 10 the most intense pain imaginable. The assessment was performed for 7 days prior to Baseline and pre-defined visits. The change from baseline was calculated as the End of Treatment (Week 12) value minus the Baseline (Day 1) value. (NCT00365352)
Timeframe: Baseline and Week 12

Change From Baseline in the Daytime Somnolence Score, an Item on the Medical Outcomes Study (MOS) Sleep Scale, at Week 12 Using LOCF

"The MOS Sleep Scale measures most constructs of sleep. The scale has a battery of questions to measure specific aspects of sleep in participants with co-morbidities. The four domains scored from the MOS Sleep Scale were sleep disturbance,' sleep quantity,' sleep adequacy, and daytime somnolence. The scores of the daytime somnolence domain ranged from 1 to 100, with a high score indicating greater daytime somnolence. The assessment was completed at Baseline (Day 1) and end of Weeks, 4, 8, and 12 (or end of Treatment)." (NCT00365352)
Timeframe: Baseline and Week 12

Change From Baseline in the Overall Life-Impact Score of the RLS Quality of Life (QoL) Questionnaire at Week 12 Using LOCF

The Restless Legs Syndrome Quality of Life (RLS-QoL) questionnaire is a disease-specific, participant-rated questionnaire that assesses the impact of RLS on daily life, emotional well-being, social life, and work life of the participants. The RLS-QoL Questionnaire is presented on a 0 (lowest possible score) to 100 (highest possible score) scale. It was completed at Day 1 and at the end of Weeks 4, 8, and 12 (or Early Termination). (NCT00365352)
Timeframe: Baseline and Week 12

Change From Baseline in the Profile of Mood State (POMS) Scale at Week 12 Using LOCF

"The Profile of Mood States (POMS) Brief Form contains 30 adjectives; each participant is asked to rate the degree to which each adjective describes themselves based on how they felt during the past week including the date on which the adjective was rated. The possible ratings range from 0 (Not all all) to 4 (Extremely). The Total Mood Disturbance Score (range of 0 to 120) is obtained by summing the values of six domains. Higher scores indicate a more negative mood disturbance. The POMS was completed at Baseline (Day 1), and at the end of Weeks 4, 8, and 12 (or Early Termination)." (NCT00365352)
Timeframe: Baseline to End of Treatment (Week 12)

Change From Baseline in the Sleep Disturbance Score, an Item on the MOS Sleep Scale, at Week 12 Using LOCF

"The MOS Sleep Scale measures most constructs of sleep. The scale has a battery of questions to measure specific aspects of sleep in participants with co-morbidities. The four domains scored from the MOS Sleep Scale were sleep disturbance,' sleep quantity,' sleep adequacy, and daytime somnolence. The scores of the sleep disturbance domain ranged from 1 to 100, with a high score indicating greater impairment of sleep. The assessment was completed at Baseline (Day 1) and end of Weeks, 4, 8, and 12 (or end of Treatment)." (NCT00365352)
Timeframe: Baseline and Week 12

Change From Baseline to the End of Treatment (Week 12) in the IRLS Rating Scale Total Score Using LOCF

The IRLS Rating scale is a measure of RLS disease severity. The scale reflects the participant-reported assessment of primary sensory and motor features and associated sleep problems in RLS. Items (individually scored from 0 to 4) are included that assess the impact of symptoms on participants' mood, daily life, and activities. The total scale score is a sum of all of the individual item scores and ranges from 0-40 points, with 40 being the most severe. The scale assesses symptoms over the week prior to measurement. (NCT00365352)
Timeframe: Baseline (Day 1) and End of Treatment (Week 12)

Change From Baseline to the End of Treatment in Average Daily Total Sleep Time (Hours) Using LOCF

Average daily total sleep time was derived from the Pittsburgh Sleep Diary (PghSD; an instrument with separate components to be completed [self-reported] at bedtime and waketime) as the mean of non-missing total sleep time over the 7 days before each visit, where total sleep time = [(wake up time - lights out time) - time to fall asleep - time awake during the night] in hours. The change was calculated as the end of treatment (Week 12) value minus the Baseline value. (NCT00365352)
Timeframe: Baseline to End of Treatment (Week 12)

Change From Baseline to the End of Treatment in Average Daily Wake Time (Minutes) After Sleep Onset Using LOCF

Average daily wake time after sleep onset was derived from the Pittsburgh Sleep Diary (PghSD) as the mean of non-missing total hours awake during the night after falling asleep over the 7 days before each visit. The change was calculated as the end of treatment (Week 12) value minus the Baseline value. (NCT00365352)
Timeframe: Baseline to End of Treatment (Week 12)

Change From Baseline to the End of Week 1 in the IRLS Rating Scale Total Score Using LOCF

The IRLS Rating scale is a measure of RLS disease severity. The scale reflects the participant-reported assessment of primary sensory and motor features and associated sleep problems in RLS. Items (individually scored from 0 to 4) are included that assess the impact of symptoms on participants' mood, daily life, and activities. The total scale score is a sum of all of the individual item scores and ranges from 0-40 points, with 40 being the most severe. The scale assesses symptoms over the week prior to measurement. (NCT00365352)
Timeframe: Baseline and the End of Week 1

Number of Participants Classsified as Responders on the Investigator-rated CGI-I Scale at Week 12 Using LOCF

"The CGI-I scale is a standardized tool that is widely used in psychopharmacologic trials. For the CGI-I, the investigator was asked to rate the participant's overall change in RLS symptoms from Baseline. Scores ranged from 1 (very much improved) to 7 (very much worse). Participants who were much improved (score of 2) or very much improved on the CGI-I scale at the end of treatment (Week 12) are classified as Responders." (NCT00365352)
Timeframe: Week 12

Number of Participants Who Had an Onset of Response to Treatment at the End of Week 1 Based Upon the IRLS Rating Scale Total Score and the Investigator-rated CGI-I Using LOCF

"The IRLS Rating scale is a measure of RLS disease severity. Items (individually scored from 0 to 4) are included that assess the impact of symptoms on participants' mood, daily life, and activities. The total scale score is a sum of all of the individual item scores and ranges from 0-40 points, with 40 being the most severe. Response was defined by an IRLS Rating Scale total score at the end of Week 1 < 15 and at least a 6-point reduction from the participant's Baseline score and an investigator-rated CGI-I response of much improved or very much improved." (NCT00365352)
Timeframe: End of Week 1

Number of Participants Who Indicated on the Mood Assessment That Their Mood Was Much Improved or Very Much Improved at Week 12 (End of Treatment) Using LOCF

The Mood Assessment is a non-disease-specific question surveying global change in a participant's overall mood. Participants were asked to rate their overall change in mood since the start of the study by choosing a score in a range from 1 (Very Much Improved) to 7 (Very Much Worse). The assessment was completed at Day 1 and the ends of Weeks 4, 8, and 12 or (Early Termination). (NCT00365352)
Timeframe: Week 12

Number of Participants With a Rating of Excellent for the Overall Quality of Sleep in Past Week Measured by the Post-Sleep Questionnaire (PSQ) at the End of Treatment (Week 12) Using LOCF

"The Post-Sleep Questionnaire (PSQ) was designed to evaluate overall sleep quality, ability to function, and RLS symptoms' interference with sleep over the past week. Participants were asked to rate overall sleep quality (as either Excellent, Reasonable, or Poor), ability to function, number of nights with RLS symptoms, number of nights awakened by RLS symptoms, and the number of hours spent awake due to RLS symptoms over the past week." (NCT00365352)
Timeframe: End of Treatment (Week 12)

Number of Total Responders to Treatment Based on the Investigator-Rated CGI of Improvement at the End of One Week of Treatment

"The CGI-I scale is a standardized tool that is widely used in psychopharmacologic trials. For the CGI-I, the investigator was asked to rate the participant's overall change in RLS symptoms from Baseline. Scores ranged from 1 (very much improved) to 7 (very much worse). Participants who were much improved (score of 2) or very much improved on the CGI-I scale at the end of treatment (Week 12) are classified as Responders." (NCT00365352)
Timeframe: End of Week 1

The Time to Onset of the First Response to Treatment on the IRLS Rating Scale Total Score and the Investigator-rated CGI-I

The Response was defined by an IRLS Rating Scale total score at the end of Week 1 < 15 and at least a 6-point reduction from the participant's Baseline score and an investigator-rated CGI-I response of much improved or very much improved. The median time to onset is estimated using the product-limit estimation method. (NCT00365352)
Timeframe: Baseline (Day 1) to End of Treatment (Week 12)

Time to Onset of the First RLS Symptom From the 24-hour RLS Record Obtained at the End of Treatment (Week 12)

The time to onset of the first RLS symptoms from the 24-hour RLS Record is defined as the length of time from the start of the 24-hour assessment period (8:00 AM) to the time when 50% of participants experienced their first symptom. (NCT00365352)
Timeframe: Week 12

Change From Baseline in the IRLS Rating Scale Total Score at Week 12 by Baseline RLS Rating Scale Total Score Category (Baseline RLS Severity) Using LOCF

The IRLS Rating scale is a measure of RLS disease severity. The scale reflects the participant-reported assessment of primary sensory and motor features and associated sleep problems in RLS. Ten items (individually scored from 0 to 4) are included that assess the impact of symptoms on participants' mood, daily life, and activities. The total scale score is a sum of all of the individual item scores and ranges from 0-40 points, with 40 being the most severe. The scale assesses symptoms over the week prior to measurement. (NCT00365352)
Timeframe: Baseline (Day 1) and Week 12

Mean Change in the IRLS Rating Scale Total Score From Baseline at Week 12 by RLS Treatment History Using LOCF

The IRLS Rating scale is a measure of RLS disease severity. The scale reflects the participant-reported assessment of primary sensory and motor features and associated sleep problems in RLS. Ten items (individually scored from 0 to 4) are included that assess the impact of symptoms on participants' mood, daily life, and activities. The total scale score is a sum of all of the individual item scores and ranges from 0-40 points, with 40 being the most severe. The scale assesses symptoms over the week prior to measurement. (NCT00365352)
Timeframe: Baseline (Day 1) and Week 12

Number of Participants Classified as Investigator-rated CGI-I Scale Responders at Week 12 by RLS Treatment History Using LOCF

"The CGI-I scale is a standardized tool that is widely used in psychopharmacologic trials. For the CGI-I, the investigator was asked to rate the participant's overall change in RLS symptoms from Baseline. Scores ranged from 1 (very much improved) to 7 (very much worse). Participants who were much improved (score of 2) or very much improved on the CGI-I scale at the end of treatment (Week 12) are classified as Responders." (NCT00365352)
Timeframe: Basline and Week 12

Number of Participants Classified as Responders to Treatment Based on the Participant-Rated CGI of Improvement at Week 1 and Week 12 (End of Treatment)

"The CGI-I scale is a standardized tool that is widely used in psychopharmacologic trials. For the CGI-I, the investigator was asked to rate the participant's overall change in RLS symptoms from Baseline. Scores ranged from 1 (very much improved) to 7 (very much worse). Participants who were much improved (score of 2) or very much improved on the CGI-I scale at the end of treatment (Week 12) are classified as Responders." (NCT00365352)
Timeframe: Week 1 and Week 12

Number of Participants Classified as Responders With at Least 30% and 50% Improvement in the Average Daily RLS Pain Score Using LOCF

"The Mean Daily RLS pain was assessed by participants reporting whether they experienced any pain associated with RLS in the last 24 hours and rating their pain levels on an 11-point numerical rating scale, with 0 being no pain and 10 the most intense pain imaginable. The assessment was performed for 7 days prior to Baseline and pre-defined visits A Responder is a participant with a score of much improved or very much improved on the investigator rated CGI I Scale at the end of treatment (Week 12 using LOCF)." (NCT00365352)
Timeframe: Week 12

Number of Participants Experiencing No RLS Symptoms in Each of the Seven 4-hour Periods From the 24-hour RLS Record at Week 12 (End of Treatment)

RLS severity ratings were summarized in 6 non-overlapping 4-hour periods beginning at 8 AM. A 4-hour period from 6 PM to 10 PM was also prospectively included to reflect the time frame when the most participants would experience their first symptoms of the day. (NCT00365352)
Timeframe: Week 12

Change From Baseline of TMS Measurement of Intracortical Facilitation at the End of the Study Drug and Placebo Treatment Periods

Transcranial Magnetic Stimulation (TMS) is a non-invasive technique which applies magnetic pulses to the brain via a coil inducing an electrical current in the brain. Stimulation is typically applied at a sufficient intensity to trigger action potentials in nearby neurons. Intracortical facilitation (ICF) and inhibition (ICI) were studied using a paired stimulus paradigm. The motor threshold (MT) was first established. The conditioning stimulus (70% MT) followed by the test stimulus (120% MT) was delivered at an interstimulus interval (ISI) of 10 ms for ICF. Each run consisted of 10 trials, and the amplitude ratio of the mean conditioned Motor Evoked Potential (MEP) to control MEP was determined. A larger amplitude ratio indicates greater cortical excitability. The differences between Placebo and Baseline, and SGS and Baseline were obtained. These values were averaged across individuals to report a mean. (NCT02019667)
Timeframe: Baseline and Six months

Change From Baseline of TMS Measurement of Long Interval Intracortical Inhibition (Long ICI) at the End of the Study Drug and Placebo Treatment Periods

Transcranial Magnetic Stimulation (TMS) is a non-invasive technique which applies magnetic pulses to the brain via a coil inducing an electrical current in the brain. Stimulation is typically applied at a sufficient intensity to trigger action potentials in nearby neurons.Intracortical facilitation and inhibition were studied using a paired stimulus paradigm. The motor threshold (MT) was first established. The conditioning stimulus (70% MT) followed by the test stimulus (120% MT) was delivered at 100 ms for long ICI. Each run consisted of 10 trials, and the amplitude ratio of the mean conditioned Motor Evoked Potential (MEP) to control MEP was determined. A larger amplitude ratio indicates greater cortical excitability. The differences between Placebo and Baseline, and SGS and Baseline were obtained. These values were averaged across individuals to report a mean. (NCT02019667)
Timeframe: Baseline and Six months

Change From Baseline of TMS Measurement of Motor Threshold at the End of the Study Drug and Placebo Treatment Periods

Transcranial Magnetic Stimulation (TMS) is a non-invasive technique which applies magnetic pulses to the brain via a coil inducing an electrical current in the brain. Stimulation is typically applied at a sufficient intensity to trigger action potentials in nearby neurons. The motor threshold is defined as the minimum percentage of the stimulator output that evoked a motor evoked potential of more than 50µV in at least 5 out of 10 trials. Motor threshold was measured at the end of the study drug period and the end of the Placebo period. The differences between Placebo and Baseline, and SGS and Baseline were obtained. A decrease from baseline value indicates increased cortical excitability and an increase from baseline value indicates reduced cortical excitability. These values were averaged across individuals to report a mean and standard deviation of this baseline-to-treatment period change. The mean for each treatment can be compared to have a baseline-adjusted treatment effect. (NCT02019667)
Timeframe: Baseline and Six months

Change From Baseline of TMS Measurement of Short Interval Intracortical Inhibition (Short ICI) at the End of the Study Drug and Placebo Treatment Periods

Transcranial Magnetic Stimulation (TMS) is a non-invasive technique which applies magnetic pulses to the brain via a coil inducing an electrical current in the brain. Stimulation is typically applied at a sufficient intensity to trigger action potentials in nearby neurons. Intracortical facilitation and inhibition were studied using a paired stimulus paradigm. The motor threshold (MT) was first established. The conditioning stimulus (70% MT) followed by the test stimulus (120% MT) was delivered at an interstimulus interval (ISI) of 2 ms for short ICI. Each run consisted of 10 trials, and the amplitude ratio of the mean conditioned Motor Evoked Potential (MEP) to control MEP was determined. A larger amplitude ratio indicates greater cortical excitability. The differences between Placebo and Baseline, and SGS and Baseline were obtained. These values were averaged across individuals to report a mean. (NCT02019667)
Timeframe: Baseline and Six months

Change From Baseline on the Adaptive Behavior Assessment System (ABAS) Test at the End of the Study Drug and Placebo Treatment Periods

The ABAS questionnaire was completed by the participant's parent or caregiver at the end of each six month treatment period.The ABAS provides a comprehensive picture of adaptive skills across the lifespan. The questionnaire addresses Conceptual, Social and Practical skills including communication, self-direction, use of leisure time, health, safety and self-care. The General Adaptive Composite score ranges from <40 to >160 with a lower score representing lower adaptive behavior. The difference between Placebo and Baseline and Study Drug and Baseline were obtained. These values were averaged across individuals to report a mean and a standard deviation of the baseline-to-treatment period change. The means for each treatment can be compared to have a baseline-adjusted treatment effect interpretation. A positive change represents an improvement in adaptive skills compared with baseline and a negative change represents a decline in adaptive skills compared with baseline. (NCT02019667)
Timeframe: baseline and six months

Results of Physical Examination at the End of the Study Drug and Placebo Treatment Periods

A physical examination was administered by a physician to subjects at the end of each six month treatment period, i.e., following completion of a six month period on SGS-742 or Placebo. Results of the examination ranged from 0-4 with scores defined as follows: 0=No observation; 1=Stable baseline findings; 2=New asymptomatic finding; 3=Patient reports some worsening of a baseline daily function associated with new finding; 4=Patient unable to carry out a baseline daily function associated with new finding (NCT02019667)
Timeframe: Six months

Reviews

2 reviews available for gamma-aminobutyric acid and Disorders of Excessive Somnolence

Trials

9 trials available for gamma-aminobutyric acid and Disorders of Excessive Somnolence

Other Studies

11 other studies available for gamma-aminobutyric acid and Disorders of Excessive Somnolence