Official Title: “Brain Mechanisms and Targeting Insomnia in Major Depression”

Preliminary studies suggest that the response to antidepressant medication can be accelerated by targeting insomnia with adjunctive use of eszopiclone.

It is not yet known what mechanism(s) support this acceleration in response, though preliminary findings support the hypothesis that early restoration of sleep may facilitate BDNF-based effects of antidepressant medications. The optimal duration of co-treatment is also unknown. This study will test specific hypotheses about brain mechanisms and evaluate the effects of continued eszopiclone beyond the time window when response acceleration should be observed.

Study Type: Interventional

Study Design: Treatment, Randomized, Double Blind (Subject, Investigator), Parallel Assignment

Study Primary Completion Date: November 2009

A critical challenge in the management of major depressive disorder (MDD) is the delay between initiating treatment with an antidepressant medication and clinical improvement.

Preliminary studies (Fava et al., 2006; Krystal et al., 2007) suggest that targeting insomnia with eszopiclone (ESZ) in patients receiving fluoxetine may lead to more rapid resolution of symptoms. Studies have not yet been able to differentiate between competing explanations of this phenomenon: whether co-treatment with ESZ actually accelerates changes in the brain associated with antidepressant treatment response, or if its effects on the insomnia component are confined to the symptomatic level ("masking"). As a non-benzodiazepine GABA-receptor agonist with FDA approval for long-term use in the treatment of sleep disturbances, ESZ is an appropriate agent for targeting insomnia in MDD without major concerns around the development of tolerance. Further research in co-treatment would be advanced by understanding the mechanism(s) underlying accelerated improvement.

Our prior work (Cook et al., 2001, 2002, 2005; Leuchter et al. 2002) has studied a new physiologic biomarker of response to SSRI and mixed-action antidepressants. The EEG-based cordance biomarker can detect the physiologic effects of successful antidepressant treatment at 48 hours, 1 week, and 2 weeks of treatment; in contrast, symptom differences between responders and non-responders did not separate until 4 weeks of treatment in our placebo-controlled trials. Additionally, the magnitude of early physiologic change was associated with the completeness of clinical response. Our biomarker has been independently studied and our findings replicated (Bareš et al., 2007). The cordance biomarker can be considered as a leading indicator or predictor of treatment outcome. As a non-invasive probe of brain physiology, it may detect early neurophysiologic changes associated with accelerated clinical response from eszopiclone.

Other research has reported that brain derived neurotrophic factor (BDNF) is reduced in many patients with MDD (Karege et al., 2002, 2005, Shimizu et al., 2003) and may rise during the course of treatment with antidepressant medication (e.g., Gonul et al., 2005; Yoshimura et al., 2007; Huang et al., 2007). BDNF-related neuroplasticity has been suggested as a mechanism by which medications can lead to mood improvement (Duman 2002; Manji et al., 2003).

Sleep patterns have also been shown to have an impact on neuroplasticity (Taishi et al., 2001; cf. Benington & Frank, 2003). A simple acute phase-shift in sleep can impact BDNF levels (Sei 2003), suggesting that a link between sleep and symptomatic recovery from depression might operate via a BDNF mechanism and reflect changes in brain physiology.

While Krystal and colleagues (2007) previously reported that the beneficial clinical effects of 8 weeks of co-treatment did not diminish significantly in the two weeks following ESZ discontinuation, controlled studies have not examined outcomes in clinically-likely scenarios employing shorter co-treatment periods (e.g., 4 weeks, during which much of the acceleration occurs).

Based on these previous studies, this study will assess patients with MDD during treatment with an SSRI antidepressant, escitalopram (ESC), administered along with either ESZ or placebo (PBO), using (a) clinical symptom ratings, (b) serum levels of BDNF, (c) cognitive function, and (d) brain physiology with EEG.

Intervention(s) in this Clinical Trial

• Drug: escitalopram and eszopiclone
  • escitalopram 10mg tabs QD and eszopiclone 3 mg tabs QD for 8 weeks
• Drug: Escitalopram, eszopiclone, and placebo
  • Escitalopram 10mg tabs QD for 8 weeks; Eszopiclone 3mg tabs QD for initial 4 weeks then placebo tabs QD for final 4 weeks
• Drug: Escitalopram
  • Escitalopram 10mg tabs QD and placebo tabs QD for 8 weeks

Arms, Groups and Cohorts in this Clinical Trial

• Experimental: 1
  • Open label escitalopram plus eszopiclone for 8 weeks
• Other: 2
  • Escitalopram and eszopiclone for initial 4 weeks, then switch to escitalopram and placebo for final 4 weeks.
• Placebo Comparator: 3
  • Escitalopram plus placebo for 8 weeks

Primary Measures

• Change in cordance value
  • Time Frame: Visits 2-9, 11 and 13
    Safety Issue?: No

Secondary Measures

• depression symptom severity
  • Time Frame: each visit
    Safety Issue?: No
• Serum BDNF
  • Time Frame: visits 2-9, 11, 13
    Safety Issue?: No
• cognitive testing
  • Time Frame: visits 2-7, 9, 11, 13
    Safety Issue?: No

Inclusion Criteria:

• Outpatients with non-psychotic, unipolar Major Depressive Disorder (MDD).
• A score of >14 on the HAM-D17.
• Presence of insomnia, manifest by a total score of ≥ 4 combining all three sleep disturbance items on the HAM-D17 scale.
• Age range: 18-64.
• Patients with suicidal ideation are eligible only if the thoughts of death or of life not being worth living are not accompanied by a plan or intention for self-harm.

Exclusion Criteria:

• Patient is mentally or legally incapacitated, unable to give informed consent.
• Patients who have a lifetime history of bipolar disorder, schizophrenia, schizoaffective disorder, MDD with psychotic features, or dementia (any etiology).
• Patients with diagnostic uncertainty or ambiguity (e.g. rule-out pseudodementia of depression) will be excluded.
• Patients with a current diagnosis of anorexia nervosa, bulimia nervosa, or obsessive compulsive disorder.
• Patients who have met diagnostic criteria for any current substance abuse disorder at any time in the 6 months prior to enrollment.
• Insomnia symptoms that have not responded to a previous trial of a sedativehypnotic prescription medication.
• Any history of seizures, brain surgery, skull fracture, significant head trauma, or previous abnormal EEG.

Gender Eligibility for this Clinical Trial: Both

Minimum Age for this Clinical Trial: 18 Years

Maximum Age for this Clinical Trial: 64 Years

Are Healthy Volunteers Accepted for this Clinical Trial?: No

Lead Sponsor: University of California, Los Angeles

Overall Clinical Trial Officials and Contacts

Ian A Cook, MD Principal Investigator Semel Institute for Neuroscience and Human Behavior at UCLA  

Overall Contact: Michelle Abrams, RN 310-825-3351 mabrams@brain.ucla.edu

Information obtained from ClinicalTrials.gov on July 02, 2009

Link to the current ClinicalTrials.gov record. http://clinicaltrials.gov/show/NCT00628914

Study ID Number: ESRC973

ClinicalTrials.gov Identifier: NCT00628914

Health Authority: United States: Institutional Review Board

UCLA Depression Research Program

UCLA Laboratory of Brain, Behavior, and Pharmacology