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. Author manuscript; available in PMC: 2014 Oct 20.
Published in final edited form as: Int J Med Biol Front. 2013;19(2):https://www.novapublishers.com/catalog/product_info.php?products_id=44874.

LONGER-TERM EFFECTIVENESS OF CBT IN TREATMENT OF COMORBID AUD/MDD ADOLESCENTS

Jack R Cornelius *, Antoine B Douaihy, Levent Kirisci, Dennis C Daley
PMCID: PMC4203425  NIHMSID: NIHMS513364  PMID: 25339844

Abstract

Cognitive Behavioral Therapy (CBT) is a commonly used therapy among persons with major depressive disorder (MDD) and also among those with alcohol use disorders (AUD). However, less is known regarding the efficacy of CBT for treating persons with co-occurring disorders involving both MDD and an AUD. Studies assessing the efficacy of CBT in adolescent populations with co-occurring disorders are particularly sparse, especially studies designed to assess the potential longer-term efficacy of an acute phase trial of CBT therapy in that youthful comorbid population. We recently conducted a first acute phase treatment study involving comorbid AUD/MDD adolescents, which involved the medication fluoxetine as well as manualized CBT therapy. The results of that acute phase study suggested efficacy for CBT therapy but not for fluoxetine for treating the depressive symptoms and the excessive alcohol use of study subjects (Cornelius et al., 2009). The current chapter provides an assessment of the long-term efficacy of CBT for treating comorbid AUD/MDD adolescents, based on results from our own long-term (four-year) follow-up study, which was conducted following the completion of our recent acute phase treatment study. The results of the study suggest long-term efficacy for acute phase CBT/MET therapy for treating both the depressive symptoms and the excessive alcohol use of comorbid AUD/MDD adolescents, but demonstrate no evidence of long-term efficacy for fluoxetine for treating either the depressive symptoms or the excessive alcohol use of that population.

1. INTRODUCTION

Cognitive Behavioral Therapy (CBT) is a commonly used therapy among persons with depressive disorders and also among those with substance use disorders. However, less is known regarding the efficacy of CBT for treating persons with co-occurring disorders involving both a depressive disorder and a substance use disorder. Studies assessing the efficacy of CBT in adolescent populations with co-occurring disorders are particularly sparse, especially studies designed to assess the longer-term efficacy of CBT in that youthful comorbid population.

To date, no controlled studies other than our own recently published study have been conducted involving CBT/MET therapy among adolescents with comorbid diagnoses of major depressive disorder (MDD) in combination with an alcohol use disorder (AUD). However, one previous controlled study of CBT therapy (in combination with a fluoxetine) trial was conducted by Riggs and colleagues (2007) among a broad sample of comorbid adolescents. That study by Riggs et al (2007) did not specifically address adolescents with comorbid major depression and an alcohol use disorder, but instead addressed the more heterogeneous population of adolescents with major depression in combination with any substance use disorder. The authors of that study concluded that fluoxetine and CBT had greater efficacy than did placebo and CBT on one but not both depression measures, and was not associated with greater decline in self-reported substance use. The authors of that article speculated that CBT therapy may have decreased the depressive symptoms of their study sample, but they could not make any conclusions about the efficacy of the CBT therapy, because no comparison sample was available that had not received the CBT therapy.

The authors of this chapter recently conducted a first acute phase treatment trial involving comorbid AUD/MDD adolescents. The acute phase trial involved the SSRI antidepressant fluoxetine versus placebo, and also utilized manualized CBT/MET therapy for all subjects in the acute phase study, including both those receiving fluoxetine and those receiving placebo. That study also included a four-year follow-up phase that included assessments conducted two years and four years after the completion of the baseline assessment. The study also included a naturalistic comparison group that had received neither CBT therapy nor protocol medication, in order to allow a preliminary assessment of the efficacy of the CBT/MET therapy. Assessments in the naturalistic comparison group were conducted at baseline and at 2-year and 4-year follow-up assessments. The results of the acute phase of that study demonstrated large within-group improvements in both depressive symptoms and in drinking, but no significant differences were noted between the fluoxetine group and the placebo group on any of the outcome variables (Cornelius, Bukstein, et al., 2009). Thus, no efficacy was noted for fluoxetine for treating either the depressive symptoms or the alcohol-related symptoms of that adolescent comorbid population, despite the prominent clinical improvements noted across the subjects who participated in the treatment study. Since all persons in that study received CBT/MET therapy during the acute phase study, it appeared that the prominent clinical improvements that had been noted during the acute phase resulted from CBT/MET therapy. Thus, the results of the acute phase trial suggested efficacy for CBT/MET but not for fluoxetine for treating the depressive symptoms and the alcohol use of those youthful comorbid subjects (Cornelius et al, 2009).

The current chapter focuses on the longer-term follow-up results from that study, based on the findings from 2-year and 4-year follow-up assessments. Thus, the current chapter provides a first preliminary assessment of the long-term efficacy of CBT/MET therapy among comorbid AUD/MDD adolescents. We hypothesized that improvements in depressive symptoms and alcohol-related symptoms noted among the subjects who had received acute phase CBT/MET therapy would continue to exceed those of a naturalistic comparison group (who had not received acute phase CBT/MET therapy) in the long-term follow-up assessments.

2. METHOD

2.1. Subjects

Before entry into this treatment protocol, the study was explained, and written informed consent was obtained from all subjects (or from a parent or guardian with child assent if the participant was a minor) after all procedures had been fully explained. The study was approved by the University of Pittsburgh Institutional Review Board. This study was conducted at the Western Psychiatric Institute and Clinic (WPIC) of the University of Pittsburgh Medical Center (UPMC). Subjects were recruited for participation in the treatment study through referrals from any of the WPIC treatment programs and by responding to newspaper, radio, and bus advertisements. During recruitment, the subjects were told that they were being recruited for a treatment study involving adolescents and young adults with a combination of depression and alcohol problems.

Study participants were required to be between 15 and 20 years of age at baseline to be included in the study. At the baseline assessment, participants were evaluated for the DSM-IV diagnoses of an alcohol use disorder (AUD) (alcohol abuse or alcohol dependence) and for major depressive disorder (MDD). The comorbid presence of both a current AUD and a current MDD was required for inclusion in the treatment study. Standardized diagnostic instruments were used to assess for current diagnoses of major depressive disorder and for alcohol abuse or dependence. The DSM-IV diagnosis of MDD was confirmed using the Schedule for Affective Disorders and Schizophrenia-Present and Lifetime Version (K-SADS-PL) (Kaufman, et al., 1997; Puig-Antich, 1986). The DSM-IV diagnosis of an alcohol use disorder (alcohol abuse or dependence) was confirmed using the Substance Use Disorders Section of the Structured Clinical Interview for the DSM (SCID) (Spitzer, et al., 2003; Martin, et al., 2000). Faculty members from our alcohol research center have validated the SCID with adolescent substance abuse populations (Martin et al., 2000). In addition, minimum current levels of drinking and of depressive symptoms were also required for study inclusion, as noted on the Timeline Follow-back scale and the HAM-D-27, respectively (Cornelius, Bukstein, et al., 2009; Cornelius, Bukstein, et al., 2010). Minimum levels of drinking for study inclusion were defined as drinking at least 10 drinks over the month prior to baseline assessment, as demonstrated on the Timeline Follow-back scale. Minimum levels of depressive symptoms for study inclusion were defined as a HAM-D-27 score of greater than or equal to 15 at the baseline assessment. Persons who did not meet the criteria for inclusion in the treatment trial because of an inadequate number of diagnostic criteria for MDD (sub-threshold for MDD) were offered the option of participating in a naturalistic comparison group which did not involve protocol medication treatment or protocol therapy, but which did involve a long-term follow-up evaluation two years and four years after completion of the study baseline, in order to provide a preliminary evaluation of the effect of the protocol CBT/MET therapy. Those persons in the naturalistic comparison group were referred to care in a dual diagnosis program near their home, and subsequently received care at the person’s discretion, provided by non-protocol staff.

Exclusion criteria included a DSM-IV diagnosis of bipolar disorder, schizoaffective disorder, or schizophrenia. Persons with hyper- or hypothyroidism, significant cardiac, neurological, or renal impairment, and those with significant liver disease (SGOT, SGPT, or gamma-GTP greater than 3 times normal levels) were also excluded from the study. Persons who had received antipsychotic or antidepressant medication in the month prior to baseline assessment were excluded. Persons with any substance abuse or dependence other than nicotine dependence or cannabis abuse or dependence were excluded from the study. Persons with any history of intravenous drug use were excluded from the study. Persons were recruited into the study regardless of race, ethnicity, or gender. Other exclusion criteria were pregnancy, inability or unwillingness to use contraceptive methods, and an inability to read or understand study forms.

2.2 CBT/MET Therapy

Cognitive behavioral approaches, such as the CBT used in this study, are based on social learning models (Carroll, 2005: Deas, 2008). CBT emphasized a functional analysis of drug use, including the development of an understanding of drug use with respect to its antecedents (triggers) and consequences. CBT emphasized the recognition of high-risk situations and the acquisition of skills to cope with craving cues and other high-risk situations. CBT has been shown to be effective across a wide range of substance use disorders (Carroll, 1996; Irwin et al, 1999; Carroll, 2005), including substance use disorders in the presence of co-occurring mood disorders (Carroll, 2004) and substance use disorders involving adolescents (Kaminer et al., 2002; Deas, 2008).

Motivational enhancement therapy (MET), including the MET used in this study, is a brief intervention used to enhance an individual’s engagement in therapy and motivation to make changes regarding substance use and high-risk behaviors (Miller et al., 1992; Miller & Wibourne, 2002; Carroll, 2004). This form of brief intervention is theoretically appealing for adolescents with substance use disorders because adolescents with those disorders are typically non-treatment-seeking, and need to be motivated to engage in treatment (Tevyaw & Monti, 2004). Primary tenets of MET include using an empathic nonjudgmental stance, performing reflective listening, avoiding arguments, and supporting self-efficacy for change (Deas, 2008). MET has been shown to be effective across a wide range of substance use disorders, with particularly strong support among alcohol abusing and dependent populations (Wilk et al., 1997; Carroll, 2005; Carroll et al., 2006). MET has also demonstrated effectiveness for treatment of substance use disorder among persons with comorbid psychiatric disorders (Swanson, et al, 1999; Baker et al., 2002), and for treating substance use disorders among adolescents ((Tevyaw & Monti, 2004).

Manual-based MET/CBT therapy was provided to all subjects in the acute phase treatment trial, including those who had received fluoxetine and those who had received placebo. Persons in the naturalistic comparison group did not receive manual-based therapy. That manual-based therapy consisted of Cognitive Behavior Therapy (CBT) for treatment of major depressive disorder and for treatment of the alcohol use disorder, and Motivation Enhancement Therapy (MET) for treatment of the alcohol use disorder. The CBT/MET therapy was provided during each protocol visit during the acute phase treatment trial, so persons who participated in the acute phase treatment trial received psychotherapy on nine occasions: baseline, week 1, week 2, week 3, week 4, week 6, week 8, week 10, and week 12.

The cognitive behavior therapy for treatment of alcohol use disorder used in this study utilized the widely used techniques described in the CBT manual utilized in Project MATCH (Kadden, et al., 1994). The Cognitive Behavior Therapy for depression used in this study utilized the widely used techniques of cognitive therapy that have been adapted for treatment of adolescent depression, as described by Brent and colleagues (1997). This therapy was chosen because cognitive behavioral therapy has been reported to be more efficacious than alternative psychosocial interventions for the acute treatment of adolescents with major depressive disorder (Birmaher, et al., 2000). The Motivation Enhancement Therapy used in this study was adapted after the Motivation Enhancement Therapy used in Project MATCH (Miller, et al., 1992).

Therapists who conducted therapy for the acute phase of the study were all Master’s level staff members with several years of experience in providing CBT/MET therapy to adolescents and young adults with comorbid MDD/AUD. They all participated in comprehensive training exercises prior to the beginning of the study to ensure standardization in therapeutic techniques. This training included extensive readings on CBT/MET therapy, viewing of CBT/MET tapes, and conducting practice therapy sessions which were viewed by all of the therapists. This process was overseen by a senior staff person with a doctorate in therapy in order to further standardize the therapy. They also participated in annual assessments of their training to ensure that no “drift” in therapy occurred.

2.3 Pharmacotherapy

Following completion of the baseline assessment, participants in the treatment trial were randomly assigned to receive fluoxetine or placebo administered in identical-looking opaque capsules. Active medication and matching placebo were prepared by the research pharmacy at the Western Psychiatric Institute and Clinic of the University of Pittsburgh Medical Center. Patient randomization was conducted by urn randomization, stratified by gender. All subjects were initially given 1 capsule (10 mg fluoxetine or placebo), which was increased after 2 weeks to 2 capsules (20 mg fluoxetine or placebo), which was the target dose of the study. The study was conducted in a double-blind fashion, though one study physician remained non-blinded in order to handle any problems which may have arisen. Ratings of alcohol use and symptom severity were conducted weekly for the first month, and biweekly for the second and third month of the 12-week acute phase study.

2.4 Assessment Procedures and Measures

Assessments for this study were completed by a Master’s level staff member with several years of experience conducting assessments with comorbid adolescents. All assessors also completed a comprehensive clinical assessors training program, lasting between 2 and 3 months. All raters participating in the proposed treatment study must have demonstrated adequate levels of inter-rater reliability prior to administering ratings. Experiential training included observation of experienced assessors with independent coding of instruments (at least 5 sessions). Agreement with the interviewing clinician must have exceeded 90% for advancement to administering assessments with an assisting supervisor present. Prior to performing solo interviews, the assessor must have completed a minimum of two assessments with a supervisor present but not assisting, and coding must have achieved 90% agreement with the observing supervisor. After the completion of formal training, monitoring continues through periodic joint interview reliability evaluations with pairs of interviewers. Pill counts were used to ensure compliance with protocol medication. The validity of participant’s self-reported drinking was assessed with breath alcohol levels. To ensure a high level of participation for these evaluations, a $20.00 payment was made to patients completing each assessment (Festinger, et al., 2008).

Subjects’ diagnoses were finalized after case presentations at diagnostic conferences, attended by two study faculty members and the assessors. This “best estimate” diagnostic procedure (which is utilized for the SCID and SCID II as well as for the K-SADS) is in accordance with the method described by Leckman and colleagues (1982), and was validated by Kosten & Rounsaville (1992).

Observer-rated depressive symptoms were assessed with the Hamilton Rating Scale for Depression (HAM-D-27) (Hamilton, 1960). The reliability and validity of the HAM-D are well established (Hamilton, 2008). Participant-rated depressive symptoms were assessed with the Beck Depression Inventory (BDI) (Beck, et al., 1961). The reliability and validity of this widely-used instrument are well established (Beck, et al., 2008). Drinking behavior was evaluated using the timeline follow-back method (TLFB) (Sobell LC, et al., 1988). The TLFB has demonstrated good reliability, validity, and clinical utility across a wide variety of populations (Sobell & Sobell, 2008). This instrument provided a daily tabulation of drinking behavior, thus providing detailed information on the quantity and frequency of this behavior. The primary alcohol use outcome variables included number of drinks per drinking day, the number of drinking days, and the number of heavy drinking days (defined as greater than or equal to 4 drinks per day for women and 5 for men).

2.5 Statistical Analysis

Descriptive statistics were calculated for all variables. Continuous baseline measures were compared by independent, 2-tailed t tests for continuous variables. Categorical baseline measures were compared by chi-square analysis, corrected for continuity. Statistical analyses were completed on an intent-to-treat basis. Outcome measures for depression and for drinking across treatment groups were compared by repeated measures analysis of variance. The outcome findings presented in this manuscript are the result of statistical comparisons between subjects who had received CBT/MET therapy during the acute phase study versus those who had received naturalistic care. Those who had received CBT/MET therapy included all subjects who had participated in the acute phase study, which included those who had received fluoxetine and those who had received placebo. All tests of significance were 2-tailed. An alpha level of less than or equal to 0.05 was used in the study. All analyses were conducted using the Statistical Package for the Social Sciences, version 15.0 (Norusis, 1992).

3. RESULTS

A total of 118 persons signed informed consent to participate in the acute phase study and completed the baseline assessment. Of those persons, 50 subjects participated in the Acute Phase Treatment Study, including 22 males and 28 females. These participants included 43 Caucasians, 4 African-Americans, and 3 with mixed race. The mean age of those 50 persons was 19.5 +/− 1.6 years.

A total of 68 persons who signed informed consent were not included in the acute phase trial, but instead were included in the naturalistic comparison group. Those 68 persons included 36 males and 32 females; and included 53 Caucasians, 10 African-Americans, and 5 persons with mixed race. The mean age of those 68 persons was 19.4 +/− 1.4 years. The only factor that distinguished those who were enrolled in the acute phase study from those who were included in the naturalistic comparison group was the number of criteria that had been met for major depressive disorder. Specifically, the number of criteria met for MDD by those who had been enrolled in the acute phase study (mean 7.2 +/− 1.2) was higher than the number of criteria met for MDD by those who had not be enrolled in that study (mean 4.8 +/− 3.1, f=3.91, p=0.05). Thus, those who were not enrolled in the naturalistic comparison group were sometimes slightly sub-threshold for MDD. No other symptom severity factor or demographic factor significantly distinguished those who were enrolled from those who were not enrolled in the acute phase study. During the acute phase study, depressive symptoms among those who had received CBT/MET therapy decreased by more than 50%, while drinking-related symptoms decreased by almost half, though no significant difference was noted between the outcomes of those who had received fluoxetine versus those who had received placebo. Subsequently, almost two-thirds (64%, N=75) of the persons who signed informed consent for possible participation in the protocol study completed the two-year follow-up assessment, and 58 of those persons participated in the four-year follow-up assessment. Additional information regarding the study design, study subjects, and study outcomes of the acute phase study have been presented elsewhere (Cornelius, Bukstein, et al, 2009), and a preliminary description of the long-term follow-up study has been presented elsewhere (Cornelius, Douaihy, Bukstein, et al. 2011).

In repeated measure analysis of variance, a significant time by enrollment status difference was noted for both depressive symptoms and alcohol-related symptoms across the two-year time period between the baseline assessment and the two-year follow-up assessment. For example, a significantly greater improvement (decrease) in depressive symptoms was noted among those who had enrolled in the treatment trial (and thus had received CBT/MET therapy) as compared to those who had not enrolled in the treatment trial on number of DSM criteria for MDD (f=14.6, p=0.000), self-reported depressive symptoms, as measured on the Beck Depression Inventory (f=12.4, p=0.001), and on observer-rated depressive symptoms, as measured on the Hamilton Depression Rating scale (f=16.6, p=0.000). Also, a significantly greater improvement (decrease) in number of DSM criteria for an alcohol use disorder was noted among those who had received CBT/MET therapy, as compared to those who had not received CBT/MET therapy (f=14.2, p=0.000). At baseline, the percentage of subjects with alcohol dependence who participated in the acute phase trial was not significantly different from the percentage with alcohol dependence in the naturalistic comparison group (81% vs. 78%, respectively). The percentage of subjects who met diagnostic criteria for alcohol dependence decreased in both treatment groups between baseline and the two-year follow-up assessment. However, the group that had participated in the CBT/MET therapy (as part of their acute phase protocol therapy) had a lower prevalence of alcohol dependence at the two-year follow-up than the group that had participated in naturalistic therapy (41% vs. 17%, chi-square=5.3, p=0.021). In contrast, no significant difference was noted between those receiving fluoxetine and those receiving placebo at any time point. Most of the subjects who participated in the acute phase trial (72%) also participated in the 4-year follow-up assessment. Similarly, at the 4-year follow-up evaluation, ratings of depressive symptoms and of alcohol quantity (but not frequency) among those who had received CBT/MET therapy were significantly lower than those noted in the comparison group (p<0.01). At the four-year follow-up assessment, the levels of depressive symptoms and alcohol-related symptoms among those who had received CBT/MET therapy were still significantly lower than baseline levels, and were not significantly different from end-of-acute phase levels (Cornelius, Douaihy, Chung, et al, 2011). Thus, the therapeutic improvements among subjects receiving CBT’MET therapy that were noted during the acute phase trial persisted across the entire four-year follow-up study.

4. CONCLUSION

Our study demonstrated that adolescents with comorbid major depression and an alcohol use disorder who had participated in manualized CBT/MET therapy during their acute phase treatment trial demonstrated greater improvement in depressive symptoms and in alcohol-related symptoms at two-year and four-year follow-up assessments compared to outcomes noted in the naturalistic comparison group who had not received CBT/MET. Those findings suggest long term efficacy for CBT/MET therapy for treating the depressive symptoms and the alcohol-related symptoms of comorbid AUD/MDD adolescents that could still be noted as much as four years after the completion of the baseline assessment for the acute phase study. In contrast, no efficacy was noted for the antidepressant medication fluoxetine versus placebo in either the acute phase study or in the long-term follow-up assessments.

Our current tentative conclusions regarding the efficacy of CBT/MET therapy for comorbid AUD/MDD adolescents are consistent with the findings of Riggs and colleagues (2007), who speculated that CBT therapy may have contributed to their higher-than expected treatment response in their pharmacotherapy/CBT treatment trial of a mixed sample of comorbid adolescents. However, the Riggs study did not involve a comparison group that did not receive verbal therapy, so no definitive conclusions were drawn concerning the effectiveness of CBT therapy among their youthful comorbid population by the authors of that paper. The results described in our current manuscript are also consistent with the promising results of our previous pilot study of open label fluoxetine in combination with CBT/MET therapy in comorbid MDD/AUD adolescents, which demonstrated acute phase and continuation efficacy for treatment at each of the yearly follow-up assessments of the five years follow-up period (Cornelius, Clark, et al., 2005; Cornelius, Clark, et al., 2007). However, that pilot study did not include a placebo comparison group or a naturalistic comparison group, so it had been unclear whether the improvements in depressive symptoms and in alcohol-related symptoms noted in that pilot study resulted from the fluoxetine or from the CBT/MET therapy. The results described in our current manuscript regarding the efficacy of CBT/MET therapy in comorbid MDD/AUD adolescents are also consistent with the results of our own recent study of adolescents with a comorbid major depression in combination with a cannabis use disorder (Cornelius, Bukstein, et al., 2010). Until the time when more definitive studies can be performed, the results of the current study in combination with the results from the Riggs study and from our own recent work suggest that psychological intervention should be considered first-line treatment for comorbid MDD/AUD adolescents, with pharmacotherapy offered to those who do not respond to this intervention alone. It is also noteworthy that the efficacy of CBT/MET could potentially mask significant medication effects in treatment studies in which CBT/MET therapy is used in both the medication arm and the placebo arm of the study.

The results of this study should be interpreted in light of some limitations. First, the sample in this study was limited to outpatient comorbid MDD/AUD adolescents. Consequently, it is unclear to what extent the results of this study generalize to the treatment of comorbid MDD/AUD adults or to comorbid adolescents in more intensive treatment settings, such as inpatient settings or partial hospital settings. Second, the sample size in the present study was limited. Large trials would be needed to more definitively evaluate the efficacy of CBT/MET therapy among comorbid MDD/AUD adolescents. Further studies are also warranted to clarify the utility of promising but unproven predictors of treatment response among comorbid populations, such as clinical predictors, neuroimaging-related predictors, and genetic predictors of treatment response among comorbid populations (Cornelius, Salloum, et al., 1997; Cornelius, Bukstein, et al., 2005; Cornelius & Clark, 2007; Cornelius, Aizenstein, et al., 2010; Cornelius, Ferrell, et al., 2010).

Acknowledgements

The authors acknowledge the assistance of Maribeth Wesesky in the preparation of this manuscript. This research was supported in part by grants from the National Institute on Alcohol Abuse and Alcoholism (R01 AA15173, R01 AA013370, R01 AA09127, R01 AA014357, K24 AA015320, K02 AA018195); the National Institute on Drug Abuse (R01 DA019142, 3R01 DA019142-04S1, and P50 DA05605).

Footnotes

Presented in part at the 34th Annual Scientific Meeting of the Research Society on Alcoholism (RSA), Atlanta, Georgia, June 25–29, 2011.

This chapter is part of a collection published by Nova Science Publishers, Inc., entitled “Cognitive Behavioral Therapy: Applications, Methods, and Outcomes.”

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