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JAIDS Journal of Acquired Immune Deficiency Syndromes:
doi: 10.1097/QAI.0b013e318158a461
Clinical Science

Motivational Interviewing and Cognitive-Behavioral Intervention to Improve HIV Medication Adherence Among Hazardous Drinkers: A Randomized Controlled Trial

Parsons, Jeffrey T PhD*†‡; Golub, Sarit A PhD*‡§; Rosof, Elana PhD*; Holder, Catherine BA*

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From the *Center for HIV/AIDS Educational Studies and Training, New York, NY; †Department of Psychology, Hunter College, City University of New York, New York, NY; ‡Social-Personality Subprogram, Graduate Center of the City University of New York, New York, NY; and the §Department of Psychology, Queens College of the City University of New York, Flushing, NY.

Received for publication March 16, 2007; accepted August 16, 2007.

Supported by a grant from the National Institute of Alcohol Abuse and Alcoholism (RO1 AA13556, Jeffrey T. Parsons, Principal Investigator).

Correspondence to: Jeffrey T. Parsons, PhD, Hunter College of the City, University of New York, 695 Park Avenue, New York, NY 10021 (e-mail: jeffrey.parsons@hunter.cuny.edu).

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Abstract

Objective: To assess the efficacy of a behavioral intervention designed to improve HIV medication adherence and reduce alcohol consumption among HIV-positive men and women.

Design: A randomized controlled trial conducted between July 2002 and August 2005.

Setting: A behavioral research center in New York City.

Participants: HIV-positive men and women (n = 143) who were on HIV antiretroviral medication and met criteria for hazardous drinking.

Intervention: Participants were randomly assigned to an 8-session intervention based on motivational interviewing and cognitive-behavioral skills building or a time- and content-equivalent educational condition.

Outcome Measures: Viral load, CD4 cell count, and self-reported adherence and drinking behavior were assessed at baseline and at 3- and 6-month follow-ups.

Results: Relative to the education condition, participants in the intervention demonstrated significant decreases in viral load and increases in CD4 cell count at the 3-month follow-up and significantly greater improvement in percent dose adherence and percent day adherence. There were no significant intervention effects for alcohol use, however, and effects on viral load, CD4 cell count, and adherence were not sustained at 6 months.

Conclusions: An 8-session behavioral intervention can result in improvement in self-report and biologic markers of treatment adherence and disease progression. This type of intervention should be considered for dissemination and integration into HIV clinics providing comprehensive care for HIV-positive persons with alcohol problems. Although the effect was attenuated over time, future studies might test the added effectiveness of booster sessions or ongoing adherence counseling.

Problem level alcohol consumption is a common issue in the treatment of individuals with HIV infection.1-4 In a national probability survey of HIV-positive adults,2 53% reported drinking in the past month and 8% (15% of those reporting drinking) could be classified as heavy drinkers, a rate twice that among the general population.5 Although the impact of alcohol on HIV disease is not fully defined, researchers believe alcohol consumption may have an impact on HIV viral replication, disease progression, and drug toxicity6 and may impair immune system function.7-10 Heavy consumption, or hazardous drinking, is likely to lead to increased risk for toxicity from antiretroviral therapy because it intensifies conditions that also place a strain on the liver, such as hepatitis C or chronic hepatitis B.6 In a series of recent studies, HIV-positive drinkers on highly active antiretroviral therapy (HAART) were twice as likely to have CD4 counts <500 cells/mL and 4 times less likely to achieve a positive virologic response to medication as compared with nondrinkers.11-13

Alcohol consumption has been linked to lower rates of adherence to HAART regimens.1,14 HIV-positive patients who drink have worse adherence than those who do not,15 with nonadherence increasing with level of drinking severity.16 Among HIV-positive persons with alcohol problems, alcohol was the most significant predictor of nonadherence,17 and problem drinkers are more likely than nondrinkers to report forgetting medication, taking medication off schedule, or running out of pills.1

Adherence to HAART regimens is of critical importance to all persons living with HIV, because nonadherence can result in inadequate viral suppression, immunologic failure, rapid disease progression, and drug resistance. Targeted interventions designed to increase adherence among HIV-positive individuals have met with only limited success.18-20 Although some interventions have demonstrated positive effects on self-reported adherence or adherence measured through pill counts or electronic bottle caps,21-27 few have demonstrated parallel improvements in clinical indicators, such as viral load.28,29 A recently published meta-analysis of 19 randomized controlled trials of HAART adherence interventions found that no single intervention had a significant effect on self-reported adherence, viral load, and CD4 count.20 Interventions focused on HIV-positive individuals with alcohol problems have proven even more challenging, failing to find significant effects.30,31 This present study was designed to evaluate the effectiveness of a theory-based intervention, Project PLUS (Positive Living Through Understanding and Support), intended to improve adherence and reduce alcohol use among HIV-positive individuals who report hazardous drinking.

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METHODS

Study Participants

From July 2002 through August 2005, potential participants were recruited through a variety of strategies, including flyers placed in clinic waiting rooms and active recruitment at HIV-related community events throughout the New York City area. Initial screening criteria required that participants were HIV-positive, at least 18 years of age, English speaking, currently taking a HAART regimen, and had scored 8 or greater on the Alcohol Use Disorder Identification Test (AUDIT).32 Because the intervention was specifically designed to target heavy or hazardous drinkers, the final requirements for enrollment included meeting criteria for hazardous drinking (>16 standard drinks per week for men or >12 standard drinks per week for women)33 and having alcohol problems greater than those associated with other drugs. All study participants gave written informed consent, and all study procedures were reviewed and approved by the Institutional Review Board of Hunter College.

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Study Design and Procedures

Eligible participants were assigned to the 8-session intervention or to an 8-session educational comparison condition, using urn randomization procedures, which are systematically biased in favor of balancing groups. This procedure preserves randomization as the primary basis for assignment to condition, is less susceptible to experimenter bias or manipulation of the assignment process by staff, allows matching on several variables (in this study, viral load and AUDIT score), and most efficiently ensures multivariate equivalence of treatment groups.34 Although it is always possible to control statistically for differences between groups in later analyses, the potential removal of such differences in the randomization process increases power by reducing the number of covariates included in primary analyses.

Each session in both conditions was 60 minutes in length and delivered individually in private offices. An 8 session intervention was selected based on input from HIV clinic directors (who indicated a willingness to deliver a more intensive intervention for heavy drinkers as these are some of their most challenging patients) and because the intervention was targeting 2 problematic and complicated behaviors that have typically not responded well to brief interventions. Sessions were designed to be completed weekly, but participants had 12 weeks to complete all 8 sessions. The first session was delivered immediately on completion of the baseline assessment, thereby ensuring that each participant had a minimum dose of 1 session.

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Intervention Condition

The Project PLUS intervention was based on the Information-Motivation-Behavioral Skills (IMB) Model,35 which posits that information and motivation activate behavioral skills, resulting in behavior change. Two complementary techniques-motivational interviewing (MI)36 and cognitive-behavioral skills training (CBST)37-were integrated, allowing trained counselors to match targeted information and skill-building techniques to the particulars of each client's motivation for change. The integration of MI and CBST provides maximum flexibility to meet the individualized needs of clients38 and has been shown to be effective in previous substance use interventions.39,40 All sessions were delivered by master's degree-prepared counselors who completed significant training in MI and CBST and received individual and group supervision throughout the project.

Sessions 1 and 2 focused on the delivery of factual information and the use of MI techniques to enhance motivation, promote personal responsibility for improving adherence and reducing alcohol use, and develop individualized behavior change plans. Each participant received individualized feedback on both behaviors based on baseline data and was provided with a wallet-sized card to facilitate self-monitoring of HAART adherence and drinking behaviors, which were reviewed at each subsequent session. In session 3, counselors conducted a functional analysis of individual antecedents for both behaviors so as to select 4 individually tailored skills-building modules (2 related to improving adherence, 2 related to reducing alcohol use) for use in sessions 4 through 7. Each module (eg, “Managing HAART Side Effects,” “Drink Refusal Skills,” “Coping with Triggers,” and “Increasing Social Support”) included a didactic portion, a self-assessment, skills-building activities, opportunities to practice, and suggested take-home activities. Session 8 addressed termination issues and relapse prevention to reinforce skills that had been developed, gain insight about participant experiences, and facilitate access to community-based resources. Fidelity to the intervention was maintained through videotaped review of 10% of each therapist's sessions, using the Motivational Interviewing Treatment Integrity coding system.41

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Education Condition

The education condition was matched to the intervention for time and content. Participants attended 8 sessions facilitated by a health educator focused on the provision of factual information through didactic methods and structured discussions about videotapes pertaining to HIV, HAART adherence, and alcohol. Health educators received initial training and ongoing individual and group supervision. All education sessions were videotaped and reviewed to ensure they did not include elements of MI or CBST.

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Measures

The primary outcome measures were viral, immunologic, and self-report measures of adherence. All blood draws were conducted on-site by a certified phlebotomist and were analyzed by Specialty Laboratories. HIV viral load was measured by reverse transcriptase polymerase chain reaction (RT-PCR) using the HIV-1 Ultraquant assay (Specialty Laboratories, Santa Monica, CA), and results were log-transformed to adjust for skew. CD4 cell counts were measured by flow cytometry.

Adherence was assessed using a timeline follow-back interview42,43 to recall, day by day, all medication doses taken and missed during the past 2 weeks. A period of 14 days was used to capture 2 weeks of weekday and weekend activity. Before the timeline follow-back, participants explained their HAART regimen and reported the number of scheduled dosing times for each medication per day. To control for differences among participants' regimens, percent dose adherence was defined as the number of doses taken in the past 14 days divided by the number of scheduled doses during that period. For each participant, an adherent day was defined as a day in which the participant missed none of his or her scheduled doses. Percent day adherence was calculated as the percent of days with perfect adherence in the past 2 weeks.

Self-reported alcohol use was measured by the collection of data on standard drinks consumed, using the timeline follow-back interview.42,43 We calculated a measure of drinks per drinking day by dividing the total number of standard drinks in the past 14 days by the number of days during that period in which the participant had at least 1 alcoholic drink.

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Data Analysis

An intent-to-treat analysis was used in which participants who completed the first follow-up assessment were analyzed according to their original assigned study condition irrespective of the number of sessions they attended.44 Analyses of intervention effects were conducted by comparing differences in means between the 2 conditions using a 2 (time period: baseline, follow-up) by 2 (condition: intervention, education) repeated measures analysis of variance (ANOVA). Repeated measures ANOVA controls for each participant's score at baseline and evaluates both the main effect of time (ie, whether all participants improve over time regardless of condition) and the time by condition interaction (ie, whether participants' improvement over time differs by experimental condition). Separate ANOVAs were conducted for each outcome measure and examined change from baseline to 3 months and from baseline to 6 months. For the primary outcome measures (log viral load and CD4 cell count), we also created dichotomous variables representing meaningful clinical improvement from baseline to after the intervention to examine the odds ratios (ORs) of improvement over time by condition.

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RESULTS

Study Participation

Figure 1 shows the flow of participants through each time point in the study. A total of 1545 potential participants completed an initial prescreen by telephone (n = 925) or in person (n = 620). Of these, 495 met initial screening criteria and 359 (74%) presented for final screening. Of these, 49 were deemed ineligible because of having drug-related problems more severe than their alcohol-related problems and/or active psychosis and 167 failed to meet criteria for hazardous drinking. In total, 143 met all criteria, completed baseline assessments, and were randomized to 1 of 2 study conditions.

Figure 1
Figure 1
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Table 1 presents background characteristics of the final sample of 130 (91%) participants who returned for their 3-month follow-up visit. The attrition rate was the same (10%) for the 6-month follow-up, and there was no significant difference in attrition between the 2 conditions at 3 or 6 months (χ2 = 0.86; P = 0.35 and χ2 = 0.08; P = 0.75, respectively). As such, retention rates were comparable to or better than those of similar randomized controlled trials of HIV adherence interventions.20 The number of sessions completed did not significantly differ between the intervention and comparison conditions (mean [M] = 7.04, SD = 1.79 and M = 7.08, SD = 2.05, respectively).

Table 1
Table 1
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Table 2 presents the baseline, 3-month, and 6-month follow-up data for each of the primary outcomes by study condition. An examination of our fidelity measures indicated that 92% of coded sessions met or exceeded standardized criteria for MI.

Table 2
Table 2
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Intervention Effects on Virologic and Immunologic Outcomes

Results from repeated-measures ANOVA revealed a significant time × condition interaction effect at the 3-month follow-up, indicating that the log viral load of participants in the intervention condition decreased from baseline, whereas the log viral load of those in the education condition increased [F(1, 116) = 6.09; P < 0.02]. To estimate the clinical significance of this reduction, we created dichotomous variables for a viral load improvement of 0.5 log or greater and a viral load improvement of 1.0 log or greater. Each 0.5-log reduction in viral load has been associated with a 30% reduction in the risk of clinical progression,45 and the most recent treatment guidelines report that effective regimens and high levels of adherence should result in 1.0-log decreases in viral load.46 A χ2 analysis of viral load improvement between intervention and comparison conditions is presented in Table 3. Compared with individuals in the education condition, intervention participants were significantly more likely to demonstrate a 0.5-log reduction in viral load (OR = 2.7; P = 0.02) and a 1.0-log reduction in viral load (OR = 2.7; P = 0.03) at the 3-month follow-up. There were no significant differences between conditions in log viral load at the 6-month visit.

Table 3
Table 3
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A significant time × condition interaction effect at the 3-month follow-up was also found for CD4 cell counts, such that CD4 cell counts of participants in the intervention condition increased from baseline, whereas CD4 cell counts of education participants declined [F(1, 115) = 6.44; P < 0.02]. To estimate the clinical significance of this reduction, we created a dichotomous variable that defined CD4 “improvement” as an increase in CD4 cell count of 10% or greater. Each 10% increase in CD4 cell count has been associated with a 15% reduction in risk of clinical progression.45 A χ2 analysis of this comparison is presented in Table 3. Compared with individuals in the education condition, intervention participants were significantly more likely to demonstrate a 10% or greater increase in CD4 cell count at the 3-month follow-up (OR = 3.4; P = 0.013). At the 6-month follow-up, CD4 cell counts of participants in the intervention condition remained higher than those in the education condition, but the interaction effect did not achieve statistical significance.

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Intervention Effects on Adherence

Repeated measures ANOVAs revealed significant main effects of time, such that participants in both conditions reported significant increases in percent dose adherence [F(1, 107) = 13.5; P < 0.001] and percent day adherence [F(1, 111) = 21.9; P < 0.001] from baseline to 3 months. The time × condition interactions were also significant, indicating that participants in the intervention condition reported a significantly larger increase in percent dose adherence [F(1, 107) = 4.0; P < 0.05] and in percent day adherence [F(1, 111) = 4.1; P < 0.05] compared with participants in the education condition. On average, percent dose adherence for individuals in the intervention condition increased 14.6% (SD = 26.3%), whereas percent dose adherence for individuals in the education condition increased only 4.3% (SD = 26.5%). Percent day adherence for participants in the intervention condition improved an average of 17.6% (SD = 17.5%) compared with only an average of 6.9% (SD = 27.8%) for those in the control condition. At 6 months, participants in both conditions reported significant improvements in percent dose adherence (M = 8.2%, SD = 29.4%) and percent day adherence (M = 8.7%, SD = 33.7%) from baseline. Improvement in percent dose adherence remained greater for individuals in the intervention condition (M = 11.1%, SD = 40%) compared with those in the education condition (M = 5.8%, SD = 27.1%), but this difference did not achieve statistical significance in the repeated measures ANOVA. The same was found for percent day adherence, with improvement remaining greater for those in the intervention condition (M = 13.5%, SD = 32.2%) compared with those in the education condition (M = 4.6%, SD = 34.7%); however, again, this difference did not achieve statistical significance.

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Intervention Effects on Drinking

Repeated measures ANOVA revealed a significant main effect of time, such that participants in both conditions reported significant decreases in the number of standard drinks from baseline to 3 months [F(1, 112) = 62.7; P < 0.001]. This significant main effect of time was sustained at the 6-month follow-up [F(1, 93) = 48.7; P < 0.001]. Similarly, all participants reported significant decreases in number of drinks per drinking day from baseline to 3 months [F(1, 112) = 35.1; P < 0.001] and from baseline to 6 months [F(1, 93) = 43.7; P < 0.001]. There were no significant time × condition interaction effects for these variables at either time point.

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DISCUSSION

The results of this randomized controlled trial of an IMB-based intervention designed to improve HAART adherence among HIV-positive hazardous drinkers demonstrated that the intervention led to significant short-term improvement in viral and immunologic outcomes and improvements in self-reported adherence behavior compared with the education comparison condition. At the 3-month follow-up, participants in the intervention condition demonstrated significantly greater decreases in viral load and increases in CD4 cell count and self-reported adherence behavior compared with participants in the comparison condition. Project PLUS is the first behavioral adherence intervention to demonstrate such improvements in all 3 measures (viral load, CD4 cell count, and percent adherence) and is the first intervention for HIV-positive individuals with alcohol-related problems to demonstrate any significant effects.

The efficacy of the Project PLUS intervention may be attributable to several factors. First, the intervention was designed to incorporate the full IMB model of behavior change, including the provision of information, utilization of MI techniques, and selection of skills-training modules. The combination of MI with CBST seems to confer greater benefit than MI alone.21 Second, the Project PLUS intervention manual includes >15 different skill-building modules, such that the skills training is targeted to specific deficits identified by each participant. Other HAART adherence interventions have used motivational and cognitive-behavioral components25 but failed to find significant effects on viral load or CD4 cell count, perhaps because they did not individually tailor modules, provide ongoing self-monitoring of adherence, and utilize personalized feedback on factors related to nonadherence. The comparison group never achieved at least 90% adherence at follow-up, unlike the intervention group, which may account for the fact that viral loads increased and CD4 cell counts declined in the comparison group.

It is important to note that participants enrolled in the Project PLUS intervention did not have to report difficulties with adherence at baseline, as has been common in other adherence interventions. At baseline, 38% of participants reported that they were already at least 95% adherent. As such, the population enrolled mirrors the broad spectrum of HIV-positive clients with alcohol problems seen in clinical settings. One meta-analytic review of HIV adherence studies found that intervention effects were significantly stronger in trials in which adherence problems were a criterion for eligibility.18 This finding suggests that the impact of the Project PLUS intervention might be even greater were it restricted to those individuals with the most significant adherence problems.

Unlike most published HIV intervention studies,20 our comparison condition was neither a “standard care” condition nor an attention control focused on different behaviors than those in the treatment condition (eg, exercise, diet/nutrition). The comparison condition was time- and content-equivalent to the intervention. Although delivered by health educators rather than by counselors and focused on didactic information and discussion of videotapes rather than on motivation and skills building, the education condition specifically addressed HAART adherence and drinking. For this reason, it is not surprising that the education condition also improved self-reported adherence and drinking behaviors. Although adherence improvement among participants in the education control condition was smaller relative to those in the intervention condition, improvement in self-reported drinking behavior was of similar magnitude, and self-reported improvement in both conditions was sustained through to the 6-month visit. These findings suggest that education alone might be sufficient to change self-reported behavior, but a more individualized and sophisticated intervention is necessary to influence virologic and immunologic outcomes. It is also possible that improvements over time in both conditions reflect a reporting bias, whereas changes in viral load and CD4 cell count reflect true changes in adherence behavior as a result of the intervention.

The intervention, however, did not seem to result in greater changes in drinking behavior compared with the education condition. Because participants were required to have alcohol problems as part of the eligibility criteria, it is possible that perceived demands to report decreased alcohol use were stronger than those for reporting adherence changes. It is also possible that for HIV-positive persons, information alone is enough to reduce alcohol use but that the individualized and tailored motivation and skills-building modules are essential to affect medication adherence. This difference may be attributable to the fact that the information provided for alcohol use focused heavily on the impact that such use has on the health and immune functioning of HIV-positive persons, perhaps making this education more salient than has traditionally been the case when education-based interventions have failed to demonstrate efficacy.

The study failed to maintain significant interaction effects at the 6-month visit, most likely because participants were no longer receiving the intervention content. Other adherence interventions have also failed to find significant effects at 6 months,25,47 and the absence of significant intervention effects for viral load and CD4 cell count at the 6-month follow-up could be attributable to a host of other clinical and biologic factors, including the development of resistance, preexisting resistance, or length of time on HAART. In addition, given the sample size at the 6-month follow-up (n = 116), the study had sufficient power (α = 0.05, 2-tailed; β = 0.20) to detect only a medium effect size or greater (Cohen d ≥ 0.51). Mean scores at the 6-month follow-up are all in the hypothesized direction (ie, the intervention group demonstrating better clinical outcomes, higher levels of adherence, and less drinking compared with the education group). It is possible that the Project PLUS intervention would benefit from “booster visits” to reinforce the intervention components and to help participants sustain the positive effects impact on adherence and virologic and immunologic functioning. Future studies should consider the inclusion of booster sessions to examine their impact on long-term outcomes.

Because of its flexibility in tailoring intervention components to the specific needs of individual patients, the Project PLUS intervention is a perfect model for integration into HIV clinical care settings. Although an “intensive” intervention by some standards, the success of Project PLUS in improving clinical outcomes suggests that it might be a cost-effective investment, especially if delivered to the patients at highest risk for nonadherence. The intervention could be delivered by many different clinic professionals, including nurses, social workers, or case managers. If integrated within an HIV clinic setting, individual CBST modules could be delivered as “booster” sessions during routine care visits or when a client presented with treatment failure because of nonadherence. Many HIV clinics struggle with providing adherence interventions for their substance-using clients, including hazardous drinkers, and Project PLUS provides a model that allows providers to target their intersecting needs and barriers to adherence. It is also possible that although designed for hazardous drinkers, the adherence components of Project PLUS could prove effective even for those without substance use problems. Because all participants were hazardous drinkers, the extent to which the intervention would work effectively with those with fewer drinking problems is unknown, but it is also possible that such persons might require a less lengthy and intensive intervention. More research is needed to develop and replicate the Project PLUS model within HIV care settings and to modify this promising intervention for use with other HIV-positive populations. Adaptations of the Project PLUS intervention, including contracted versions, should be examined for effectiveness.

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ACKNOWLEDGMENTS

The authors acknowledge the contributions of the other members of the Project PLUS team: Joseph C. Punzalan, Dr. Jose E. Nanin, Dr. Bradley Thomason, Michael Adams, Dr. Christian Grov, James Kelleher, Juline Koken, Brooke Wells, and Chris Hietikko. We would also like to thank Kendall Bryant for his support of the project, and all of the clinics and sites that provided access to potential participants.

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Keywords:

alcohol consumption; behavioral intervention; CD4; hazardous drinking; medication adherence; viral load

© 2007 Lippincott Williams & Wilkins, Inc.

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