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Cognitive Behavioral Therapy for Insomnia Enhances Depression Outcome in Patients with Comorbid Major Depressive Disorder and Insomnia

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Cognitive Behavioral Therapy for Insomnia Enhances Depression Outcome in Patients with Comorbid Major Depressive Disorder and Insomnia INSOMNIA AND DEPRESSION Cognitive Behavioral Therapy for Insomnia Enhances Depression Outcome in Patients with Comorbid Major Depressive Disorder and Insomnia Rachel Manber, PhD1; Jack D. Edinger, PhD2; Jenna L. Gress, BA1; Melanie G. San Pedro-Salcedo, MA1; Tracy F. Kuo, PhD1; Tasha Kalista, MA1 1Stanford University, Stanford, CA; 2VA Medical Center and Duke University Medical Center, Durham, NC Study Objective: Insomnia impacts the course of major depressive severity index (ISI), daily sleep diaries, and actigraphy. disorder (MDD), hinders response to treatment, and increases risk for EsCIT + CBTI resulted in a higher rate of remission of depression depressive relapse. This study is an initial evaluation of adding cogni- (61.5%) than EsCIT + CTRL (33.3%). EsCIT + CBTI was also associat- tive behavioral therapy for insomnia (CBTI) to the antidepressant medi- ed with a greater remission from insomnia (50.0%) than EsCIT + CTRL cation escitalopram (EsCIT) in individuals with both disorders. (7.7%) and larger improvement in all diary and actigraphy measures of Design and setting: A randomized, controlled, pilot study in a single sleep, except for total sleep time. academic medical center. Conclusion: This pilot study provides evidence that augmenting an Participants: 30 individuals (61% female, mean age 35±18) with MDD antidepressant medication with a brief, symptom focused, cognitive- and insomnia. behavioral therapy for insomnia is promising for individuals with MDD Interventions: EsCIT and 7 individual therapy sessions of CBTI or and comorbid insomnia in terms of alleviating both depression and in- CTRL (quasi-desensitization). somnia. Measurements and results: Depression was assessed with the Keywords: Major depressive disorder, Insomnia, Cognitive behavioral HRSD17 and the depression portion of the SCID, administered by raters therapy, Remission masked to treatment assignment, at baseline and after 2, 4, 6, 8, and Citation: Manber R; Edinger JD; Gress JL; San Pedro-Salcedo MG; 12 weeks of treatment. The primary outcome was remission of MDD at Kuo TF; Kalista T. Cognitive behavioral therapy for insomnia enhances study exit, which required both an HRSD17 score ≤ 7 and absence of depression outcome in patients with comorbid major depressive disor- the 2 core symptoms of MDD. Sleep was assessed with the insomnia der and insomnia. SLEEP 2008;31(4):489-495. DIFFICULTY INITIATING AND/OR MAINTAINING SLEEP Sleep disturbance does not always resolve with antidepres- IS COMMON IN MAJOR DEPRESSIVE DISORDER (MDD) sant treatment. Sleep difficulties are also common residual BUT IS OFTEN INADEQUATELY ADDRESSED. Subjec- symptoms in individuals who have responded to depression tive and objective (electroencephalographic) sleep disturbances treatment.6-10 Continued insomnia following the acute phase of are associated with slower and lower rates of remission from antidepressant therapy poses a significant risk for relapse. For depression.1-3 Depressed patients with abnormal sleep profiles example, two-thirds of patients with persistent insomnia at the have significantly poorer clinical outcomes with respect to end of treatment with nortriptyline and interpersonal psycho- symptom ratings, attrition and remission rates, and the stabil- therapy relapsed within one year after switching to pill placebo. ity of response to treatment than those with more normal sleep In contrast, 90% of patients with good sleep at the end of the profiles.2,4 Patients with MDD who experience sleep continuity acute treatment remained well during the first year after dis- disturbance and early morning awakening are also more likely continuing antidepressants.11 Additionally, there are indications to have suicidal ideation than those without such disturbances.5 that insomnia may be a first-occurring prodromal symptom in Collectively, these findings indicate that insomnia symptoms previously depression-remitted persons.12 Thus, insomnia is of- hinder response to antidepressant treatment. ten more than merely a correlate or symptom of the depressive illness; it also affects the course of the illness, response to treat- ment, and when unresolved, it is a risk factor for relapse. The prevailing model for the development of insomnia Disclosure Statement This was not an industry supported study. Forest Laboratory provided is based on the diathesis-stress model whereby a “stressor” medication used in the study. Dr. Edinger has received research support precipitates insomnia in predisposed individuals. This model from Respironics; has consulted for Respironics/MiniMitter Division; has posits that, with time, conditioned insomnia develops and per- participated in speaking engagements for Sleep Medicine Education Insti- sists even after the stressor is removed. Specifically, as anxiety tute; and participated in a advisory panel meeting for Takeda. Dr. Kuo has about not being able to sleep grows, it can lead to cognitive received research support from Jazz Pharmaceuticals. The other authors and/or somatic arousal that further interferes with sleep and have indicated no financial conflicts of interest. perpetuates the sleep problem.13 When these sleep difficulties become associated with significant distress or impairment of Submitted for publication September, 2007 function in significant domains, all criteria for a diagnosis of Accepted for publication January, 2008 insomnia are met and the individual experiences comorbid Address correspondence to: Rachel Manber, PhD, Department of Psy- MDD and insomnia. Thus, insomnia is no longer simply a chiatry and Behavioral Sciences, Stanford University, 401 Quarry Rd., symptom of depression, but has become an independent dis- Stanford, CA 94305; Tel: (650) 724-2377; Fax: (650) 725-8910; E-mail: ease process and a comorbid disorder that can subsequently [email protected] hinder antidepressant response. SLEEP, Vol. 31, No. 4, 2008 489 Enhancing Depression Outcome in MDD and Insomnia—Manber et al Cognitive-behavioral therapy for insomnia (CBTI) is a skill- conditions incompatible with the study medication escitalopram based, nonpharmacological intervention with many attributes (e.g., pregnancy or lactation, not using a reliable birth control that make it appealing for addressing insomnia in the context of method, history of seizure disorder, presence of diseases, and MDD. Extensive research summarized in several meta-analy- conditions that produce altered metabolism or hemodynamic ses14-17 has shown that CBTI produces improvements in primary responses, and hepatic or renal dysfunction); (5) current ongo- insomnia equivalent to those achieved during acute treatment with ing psychotherapy, pharmacotherapy, alternative therapy, or any hypnotic medications18,19 in terms of reducing nocturnal wakeful- other treatment of claimed efficacy for depression or insomnia ness, increasing sleep efficiency, and improving subjective sleep including any over-the-counter medications or herbs (e.g., me- quality.14,20 There is also some evidence that CBTI is effective for latonin, valerian, kava, hop extract, St John wort, SAMe); (6) insomnia that is comorbid with depression.21-25 Most important, Ten or more arousals per hour of sleep related to respiratory sleep improvements achieved during CBTI endure up to 2 years events (apneas and hypopneas); (7) ten or more periodic limb after the course of CBTI is completed.26 This attribute of CBTI movement events per hour during sleep; (8) meeting The In- is particularly important in the context of depression, as patients ternational Classification Of Sleep Disorders, Second edition who remain insomnia free are likely to remain depression free for (ICSD-2)32 criteria for circadian rhythm disorder, parasomnia, longer periods of time than those whose insomnia recurs.12,27 narcolepsy, or other primary sleep disorder; (9) uncontrolled The aim of the present randomized controlled pilot study medical conditions; (10) comorbid psychiatric conditions other was to evaluate the feasibility, acceptability, and indications of than MDD (based on a SCID interview); (11) abnormal thyroid efficacy of combining an antidepressant medication (escitalo- function (based on laboratory testing) or abnormal urine drug pram) with CBTI in people with MDD and insomnia. The main screen; (12) inadequate English language fluency. outcome measure was remission from MDD, which is consid- ered the ultimate goal of depression treatment.28 Treatments METHOD Participants received 12 weeks of EsCIT, open label and concomitantly 7 individual sessions of CBTI or CTRL therapy. Participants The frequency of CBTI and CTRL treatment was identical (5 weekly sessions followed by 2 biweekly sessions). EsCIT was Participants were recruited through newspaper advertise- selected as a representative of the most commonly prescribed ment, electronic bulletin boards, community postings, and bro- class of antidepressant medications, the selective serotonin in- chures in clinics. The advertisements invited participation in a hibitors (SSRIs). It has the added advantage that the proportion study on depression and insomnia and did not disclose the study of patients reporting daytime somnolence (6%) and insomnia hypothesis. The advertising materials stated that “participants (9%) as side effects is equivalent (product insert: http://www. will receive psychotherapy for insomnia and medication for de- frx.com/products/lexapro.aspx). The initial dose of EsCIT was pression.” Recruitment took place between June 2004 and Au- 5 mg. It was increased to 10 mg during the second
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