The Effects of Eszopiclone and Lexapro on Prefrontal Glutamate and GABA in Depression With Anxiety and Insomnia

Study Overview
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Brief Summary
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The study examined the effects of adding the sleep aid eszopiclone to Lexapro on mood and levels of the neurotransmitters glutamate, glutamine, and GABA in women with depression, anxiety, and insomnia. Specifically, the objective was to determine the role of glutamate, glutamine, and GABA in mediating the response the to the combined treatment. The hypothesis was that levels of glutamine and glutamate will be increased in women receiving eszopiclone compared to those receiving placebo. The antidepressant effect of the medication combination and its effect on sleep status was also assessed.

Official Title
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The Effects of Eszopiclone and Lexapro on Prefrontal Glutamate and GABA in Depression With Co-morbid Anxiety and Insomnia: A Proton MRS Study

Conditions
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Depression, Anxiety, Insomnia

Intervention / Treatment
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* Drug: Eszopiclone
* Drug: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Female aged 18 to 55 years and regularly menstruating. Meets DSM-IV criteria for unipolar major depression. Insomnia severity index score > 10. Hamilton Anxiety scale score > 15. Hamilton Depression scale score > 17. Capable of providing informed consent. Has an established residence and phone. Exclusion Criteria: Meets DSM-IV criteria for schizophrenia, schizoaffective disorder or other axis I or II diagnosis except co-morbid anxiety disorder and insomnia. Actively abusing substances or alcohol; or has met DSM-IV criteria for substance dependence in the past month. Pregnancy. Use of benzodiazepines or other sedative-hypnotics, beta blockers, calcium channel blockers, antidepressants, antipsychotic medications, lithium or other medication which in the opinion of the investigator could alter glutamate or GABA activity in the brain. A medical condition, which in the opinion of the investigator could possibly affect the individual's brain levels of Glu and GABA. Participation in a research protocol that included administration of medication within the past 3 months. Cigarette smoking. Subject has known allergic sensitivity to any of the study to escitalopram, eszopiclone or zopiclone. Clinically significant suicidal ideation or risk of suicide as evidenced by formulation of a plan or steps taken to act on those feelings. History of clinically significant hepatic impairment. Subject is taking a potent cytochrome p450 3A4 inhibitor medication (ritonavir, nelfinavir, indinavir, erythromycin, clarithromycin, troleandomycin, ketoconazole, itraconazole) and is unwilling or it is clinically contraindicated to stop the medication.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 55 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Eszopiclone<br>Lexapro for 10 weeks together with eszopiclone. | Drug: Eszopiclone<br>* Subjects receive 10 mg escitalopram daily for four weeks and 10 or 20 mg for an additional six weeks. Subjects also receive 3 mg eszopiclone.<br>* Other names: Lunesta;|
| Placebo Comparator: Placebo<br>Lexapro for 10 weeks together with placebo. | Drug: Placebo<br>* Subjects receive 10 mg of escitalopram daily for four weeks followed by 10 or 20 mg for an additional six weeks. Subjects also receive placebo for eszopiclone.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in Anterior Cingulate Cortex Glutamine From Baseline to Week 1. | Glutamine levels were measured by single voxel magnetic resonance spectroscopy. In order to normalize the data, the glutamine values were expressed as a ratio to levels of creatine, since creatine levels are not expected to vary significantly. | baseline and 1 week | 
| Change in Thalamic Glutamine From Baseline to Week 1 | Glutamine levels were measured by single voxel magnetic resonance spectroscopy in the left thalamus. In order to normalize the data, the glutamine values were expressed as a ratio to levels of creatine, since creatine levels are not expected to vary significantly. | baseline and 1 week | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in Anterior Cingulate Cortex Glutamate From Baseline to Week 1 | Glutamate levels were measured in the anterior cingulate cortex using single voxel magnetic resonance spectroscopy. In order to normalize the data, the glutamate values were expressed as a ratio to levels of creatine, since creatine levels are not expected to vary significantly. | baseline and 1 week | 
| Change in Thalamic Glutamate From Baseline to Week 1 | Glutamate levels were measured in the left thalamus using single voxel magnetic resonance spectroscopy. In order to normalize the data, the glutamate values were expressed as a ratio to levels of creatine, since creatine levels are not expected to vary significantly. | baseline and 1 week | 
| Change in Anterior Cingulate Cortex GABA From Baseline to Week 1 | GABA levels were measured in the anterior cingulate cortex using single voxel magnetic resonance spectroscopy. In order to normalize the data, the GABA values were expressed as a ratio to levels of creatine, since creatine levels are not expected to vary significantly. | baseline and 1 week | 
| Change in Thalamic GABA From Baseline to Week 1 | GABA levels were measured in the left thalamus using single voxel magnetic resonance spectroscopy. In order to normalize the data, the GABA values were expressed as a ratio to levels of creatine, since creatine levels are not expected to vary significantly. | baseline and 1 week | 
| Change in Hamilton Depression Rating Scale Score From Baseline to Week 10 | The Hamilton Depression Rating Scale is a 21 item scale that assesses symptoms of depression with items rated on a scale of 0-4 or 0-2. The total score range is 0 to 65. A score of 7 or lower is generally considered to be an absence of depressive symptoms. A score of 18 was considered to be the cut-off for enrollment in this study, as this indicates clinically significant depression. A higher score represents greater severity of depressive symptoms. | baseline and 10 weeks | 
| Change in Hamilton Anxiety Rating Scale Score From Baseline to Week 10 | The Hamilton Anxiety Rating Scale is a 14 item ordinal scale that assesses symptoms of anxiety with ratings from 0-4. The score range is 0 to 56, with a higher score indicating higher levels of anxiety. A score of 15 was designated as the cut-off for enrollment in the study. | baseline and 10 weeks | 
| Change in Insomnia Severity Index Score From Baseline to Week 10 | The Insomnia Severity Index is a 7 item scale that assesses difficulty sleeping and effect on quality of life with item scores from 0-4. The total score range is 0 to 28 with higher scores indicating higher levels of impairment and distress. | baseline and 10 weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Magnetic Resonance Spectroscopy, Glutamate, Glutamine, GABA, Lexapro, Lunesta, Escitalopram, Eszopiclone