A prospective study of predictors of adherence to combination antiretroviral medication

Effects of a treatment adherence enhancement program on health literacy, patient-provider relationships, and adherence to HAART among low-income HIV-positive Spanish-speaking Latinos

The impact of an adherence enhancement program for low income HIV-infected Spanish-speaking Latinos on health literacy, patient-provider relationships, and adherence to HAART was examined. Evaluations were conducted at baseline, 6 weeks, and 6 months for participants (n = 85) randomly assigned to either the intervention group or a comparison group; 69 (81%) remained in the study for the entire 6-month duration. The intervention group scored significantly better than the comparison group on 3 of 5 measures of HIV health literacy at 6 weeks and on 2 of 5 measures, at 6 months. While there was a weak trend for the intervention group to report an increase in self-efficacy of medication adherence management, baseline to 6 weeks, no other changes were significant. Perceptions of the quality of relationship and communications with their HIV-treating physicians improved both at 6 weeks (p = 0.04) and at 6 months (p < 0.001). The comparison group showed little change baseline to 6 weeks and baseline to 6 months. While there was a trend for the pilot group to report better medication adherence, these differences were not statistically significant. Further evaluation of the impact of this adherence enhancement program is needed.

Self-care of women growing older with HIV and/or AIDS

The purpose of this report is to describe the ways older women living with HIV perceive of and practice self-care. Data are taken from a culturally diverse subsample of 9 women age 50 years or older who participated in a larger longitudinal qualitative study of women who were HIV infected. During a period of 2 years, 10 semistructured narrative interviews were conducted with each of the 9 participants to gain an in-depth understanding of their experiences with symptom management, adherence to medical regimens, reduction of HIV risk, access to health care and social services, and personal efforts to maintain their health. Transcribed data were managed using Nvivo software and analyzed using multistaged narrative analysis. Findings suggest that mature women living with HIV integrate actions to maintain bodily comfort and improve physical well-being with actions that champion and conserve the existential self. Excerpts from their interviews illustrate this dialectical understanding of self-care.

Hepatitis C virus treatment decision-making in the context of HIV co-infection: the role of medical, behavioral and mental health factors in assessing treatment readiness

Hepatitis C virus (HCV)-related liver disease is among the leading causes of mortality among HIV patients, yet very few co-infected patients receive pegylated-interferon and ribavirin combination therapy, the standard of care for chronic HCV. Whereas factors related to the provider, patient and clinic setting all contribute to HCV treatment decision-making, the decision of the provider to recommend or defer treatment is perhaps the most critical determinant of whether a patient receives treatment. This paper reviews the literature related to the medical, behavioral and mental health variables that contribute to providers' assessment of treatment readiness, and associations with treatment response, adherence and retention. A greater understanding of the multilevel factors contributing to HCV treatment decision-making, as well as patient characteristics that predict treatment outcome and adherence, can inform the development of interventions aimed at improving HCV care for HIV patients.

Variations in patterns of highly active antiretroviral therapy (HAART) adherence

Strict adherence to highly active antiretroviral therapy (HAART) is necessary for successful suppression of HIV replication. A large number of individuals are not adherent, however, and the reasons for non-adherence are varied and complex. We utilized cluster analyses to identify subgroups of adherers in a sample of 222 HIV positive individuals whose HAART use was electronically monitored. Five distinct subgroups were identified, with characteristic variations across the week and over the course of the 4-week study. Additional comparisons of demographic and behavioral variables found the worst adherers to have higher rates of substance use, and that a group with higher rates of cognitive impairment had a consistent drop in adherence during the weekends. In addition, the group with the best adherence had more individuals over the age of 50 years. The results of the current study indicate that distinct subgroups of adherers may exist, and suggest that interventions designed to improve adherence can be designed to accommodate this variability in behavior.

A randomized controlled trial to enhance antiretroviral therapy adherence in patients with a history of alcohol problems

OBJECTIVE

To assess the effectiveness of an individualized multicomponent intervention to promote adherence to antiretroviral therapy (ART) in a cohort of HIV-infected individuals with a history of alcohol problems.

DESIGN

We conducted a randomized controlled trial to compare the usual medical follow-up with an adherence intervention.

SETTING

The principal enrolment site was Boston Medical Center, a private, not-for-profit, academic medical institution.

SUBJECTS

HIV-infected patients with a history of alcohol problems on ART. A total of 151 were enrolled and 141 (93%) were assessed at follow-up.

INTERVENTION

A nurse, trained in motivational interviewing, completed the following over 3 months in four encounters: addressed alcohol problems; provided a watch with a programmable timer to facilitate pill taking; enhanced perception of treatment efficacy; and delivered individually tailored assistance to facilitate medication use.

MAIN OUTCOME MEASURES

Prior 30-day adherence > or =95%, prior 3-day adherence of 100%, CD4 cell count, HIV RNA and alcohol consumption, each at both short- and long-term follow-up.

RESULTS

At follow-up, no significant differences in medication adherence, CD4 cell count, HIV RNA or alcohol consumption were found (all P values >0.25).

CONCLUSIONS

A multicomponent intervention to enhance adherence among HIV-infected individuals with a history of alcohol problems was not associated with changes in medication adherence, alcohol consumption or markers of HIV disease progression. The failure to change adherence in a group at high risk for poor adherence, despite utilizing an intensive individual-focused patient intervention, supports the idea of addressing medication adherence with supervised medication delivery or markedly simplified dosing regimens.

Correlation of a Brief Perceived Stress Measure With Nonadherence to Antiretroviral Therapy Over Time

Adherence to antiretroviral medications has proven to be a challenge for individuals diagnosed with HIV infection. Nonadherence can lead to treatment failure, HIV resistance, and poor health outcomes. Many published studies have described factors associated with poor adherence, yet few have presented validated scales that could practically be applied in treatment settings to identify individuals at higher risk of nonadherence. This article explores the relationship between a revised version of the Perceived Stress Scale and nonadherence to antiretroviral therapy. The scale consists of the following items: How often in the past month have you felt that you were unable to control the important things in your life; confident in your ability to handle your personal problems; that things were going your way; and difficulties were piling up so high you could not handle them? Response options were "never or rarely," "sometimes," "often," and "mostly or always." In multivariate analysis, clients who scored in the highest quartile of perceived stress were more than twice as likely to be nonadherent at baseline and follow-up 1 and more than 5 times as likely to be nonadherent at follow-up 2 than clients in the lowest quartile of perceived stress scores.

Adherence, stereotyping and unequal HIV treatment for active users of illegal drugs

Adherence to antiretroviral therapy promotes viral suppression and extends the lives of individuals with HIV, yet illegal drug users are underrepresented among eligible persons receiving HIV treatment. One explanation for this is the assumption that drug users are less capable than others of adhering to complicated medication regimens. This paper investigates this assumption by making explicit a number of its underlying propositions and examining them in light of data collected from 52 active drug users living in and around Boston, USA, who were taking highly active antiretroviral therapy for HIV (HAART). The propositions are: (1) drug users lead "chaotic" lives; (2) active drug users are always using drugs; (3) being under the influence of drugs precludes taking medications as prescribed; and (4) drug users are intrinsically different from non-users in the lives they lead and the problems they face. Data collection consisted of a series of qualitative interviews with each participant. An analytic approach informed by grounded theory was used to construct thematic content categories from the data. Results revealed stability and control as well as "chaos" in the lives of study participants. Frequency of drug use varied considerably. Using did interfere with adherence, but not in every circumstance or all cases. Not "carrying" medications, competing priorities, and re-defining regimens were the most salient of a number of non-drug-use-related obstacles observed. Documentation of patterns of variation in corresponding data highlights the stereotypical quality of the propositions. Stereotyping risks overemphasis on drug use as a barrier to adherence for active users, and underemphasis on non-drug-use-related obstacles. Adherence capabilities of users, in contrast to inadequacies, are also obscured through stereotyping. As a medium for stigmatization, stereotyping may contribute to unequal treatment for drug users and other populations living with HIV.

The prevalence of limited health literacy

OBJECTIVE

To systematically review U.S. studies examining the prevalence of limited health literacy and to synthesize these findings by evaluating demographic associations in pooled analyses.

DESIGN

We searched the literature for the period 1963 through January 2004 and identified 2,132 references related to a set of specified search terms. Of the 134 articles and published abstracts retrieved, 85 met inclusion criteria, which were 1) conducted in the United States with > or =25 adults, 2) addressed a hypothesis related to health care, 3) identified a measurement instrument, and 4) presented primary data. The authors extracted data to compare studies by population, methods, and results.

MAIN RESULTS

The 85 studies reviewed include data on 31,129 subjects, and report a prevalence of low health literacy between 0% and 68%. Pooled analyses of these data reveal that the weighted prevalence of low health literacy was 26% (95% confidence interval [CI], 22% to 29%) and of marginal health literacy was 20% (95% CI, 16% to 23%). Most studies used either the Rapid Estimate of Adult Literacy in Medicine (REALM) or versions of the Test of Functional Health Literacy in Adults (TOFHLA). The prevalence of low health literacy was not associated with gender (P=.38) or measurement instrument (P=.23) but was associated with level of education (P=.02), ethnicity (P=.0003), and age (P=.004).

CONCLUSIONS

A pooled analysis of published reports on health literacy cannot provide a nationally representative prevalence estimate. This systematic review exhibits that limited health literacy, as depicted in the medical literature, is prevalent and is consistently associated with education, ethnicity, and age. It is essential to simplify health services and improve health education. Such changes have the potential to improve the health of Americans and address the health disparities that exist today.

Perceived adverse effects of antiretroviral therapy

Adverse effects from antiretroviral therapy (ARV) for HIV are associated with medication nonadherence. The purposes of this study were to explore group differences in the reporting of adverse effects, identify individual adverse effects that are linked to nonadherence, and to explore the role of coping in the relationship between adverse effects and adherence. Cross-sectional interviews of 2,765 HIV-positive adults on ARV therapies in four U.S. cities were performed using a computerized assessment of self-reported adverse effects, coping self-efficacy, and adherence. There were no gender differences in the rate or severity of adverse effects reported. Latino respondents reported more adverse effects than either White or African Americans. Those taking a protease inhibitor (PI) reported a higher rate and greater severity of adverse effects. Older participants reported fewer adverse effects despite being more likely to be on a regimen containing a PI. Respondents with less than 90% adherence reported greater numbers and severity of adverse effects overall. In multivariate analyses, nausea, skin problems, vomiting, and memory adverse effects were independently related to less than 90% adherence over the prior three days. Coping moderated the relationship between nausea and adherence such that individuals who reported lower coping self-efficacy and experienced nausea were at increased risk for nonadherence, regardless of the length of time on the current ARV regimen. Women and men are similar in their overall reports of adverse effects, and Latinos report more adverse effects to ARVs than White or African American patients. Specific adverse effects (skin problems, memory problems, vomiting, and nausea) are more likely than others to be associated with missing ARV medications. Increasing adaptive coping self-efficacy among patients experiencing nausea may be a particularly effective strategy in increasing medication adherence.

Heavy alcohol consumption in individuals with HIV infection: effects on neuropsychological performance

Higher rates of alcohol use have been reported in HIV+ individuals compared to the general population. Both heavy alcohol use and HIV infection are associated with increased risk of neuropsychological (NP) impairment. We examined effects of heavy active alcohol use and HIV on NP functioning in a large sample of community-residing HIV+ individuals and HIV- controls. The four main study groups included 72 HIV- light/non-drinkers, 70 HIV- heavy drinkers (>100 drinks per month), 70 HIV+ light/non-drinkers, and 56 HIV+ heavy drinkers. The heavy drinking group was further subdivided to assess effects of the heaviest levels of active alcohol use (>6 drinks per day) on NP functioning. A comprehensive NP battery was administered. Multivariate analysis of covariance was employed to examine the effect of HIV and alcohol on NP functioning after adjusting for group differences in age and estimated premorbid verbal intellectual functioning. The analyses identified main effects of heavy drinking and HIV on NP function, with greatest effects involving the contrast of HIV+ heavy drinkers and the HIV- light drinkers. Synergistic effects of heaviest current drinking and HIV infection were identified in analyses of motor and visuomotor speed. Supplementary analyses also revealed better NP function in the HIV+ group with antiretroviral treatment (ART) and lower level of viral burden, a finding that was consistent across levels of alcohol consumption. Finally, heavy alcohol use and executive functioning difficulties were associated with lower levels of self-reported medication adherence in the HIV+ group. The findings suggest that active heavy alcohol use and HIV infection have additive adverse effects on NP function, that they may show synergistic effects in circumstances of very heavy active alcohol use, and that heavy drinking and executive functioning may mediate health-related behaviors in HIV disease.

Abacavir compared to protease inhibitors as part of HAART regimens for treatment of HIV infection: patient satisfaction and implications for adherence

The purpose of this study was to compare treatment satisfaction with triple nucleoside reverse transcriptase inhibitor (NRTI) highly active antiretroviral treatment (HAART) regimens including abacavir (ABC) to HAART regimens that include protease inhibitors (PIs) and to estimate the relationship between patient satisfaction and adherence to HAART. Three open-label clinical trials comparing ABC-including HAART regimens with PI-including HAART regimens were completed, two with patients previously untreated with antiretroviral therapy and one with patients successfully treated with PI-including HAART regimens. The HIV Treatment Satisfaction Questionnaire (HIVTSQ) was completed at several time points during each trial. Levels of patient satisfaction with the ABC and PI regimens were compared for all three trials. The correlation between adherence and patient satisfaction scores was measured using data from an adherence questionnaire in one of the studies. In all three clinical trials, patient satisfaction scores were significantly higher with an ABC-including triple NRTI HAART regimen than with a PI-including HAART regimen. The difference was apparent by week 4 of the trial and was maintained throughout the trial time period. Inspection of the item responses in the patient satisfaction questionnaire indicated that treatment convenience, flexibility, impact on lifestyle, and side effects were key factors in the difference in satisfaction between the treatment groups. In addition, patient satisfaction was shown to be significantly correlated with adherence defined as taking 95% or more of prescribed doses. Greater satisfaction was reported by patients given an ABC-including HAART regimen than those given a PI-including HAART regimen. Patient satisfaction may be an indicator for better treatment adherence.

Literacy and health outcomes: a systematic review of the literature

OBJECTIVE

To review the relationship between literacy and health outcomes.

DATA SOURCES

We searched MEDLINE, Cumulative Index to Nursing and Allied Health (CINAHL), Educational Resources Information Center (ERIC), Public Affairs Information Service (PAIS), Industrial and Labor Relations Review (ILLR), PsychInfo, and Ageline from 1980 to 2003.

STUDY SELECTION

We included observational studies that reported original data, measured literacy with any valid instrument, and measured one or more health outcomes. Two abstractors reviewed each study for inclusion and resolved disagreements by discussion.

DATA EXTRACTION

One reviewer abstracted data from each article into an evidence table; the second reviewer checked each entry. The whole study team reconciled disagreements about information in evidence tables. Both data extractors independently completed an 11-item quality scale for each article; scores were averaged to give a final measure of article quality.

DATA SYNTHESIS

We reviewed 3,015 titles and abstracts and pulled 684 articles for full review; 73 articles met inclusion criteria and, of those, 44 addressed the questions of this report. Patients with low literacy had poorer health outcomes, including knowledge, intermediate disease markers, measures of morbidity, general health status, and use of health resources. Patients with low literacy were generally 1.5 to 3 times more likely to experience a given poor outcome. The average quality of the articles was fair to good. Most studies were cross-sectional in design; many failed to address adequately confounding and the use of multiple comparisons.

CONCLUSIONS

Low literacy is associated with several adverse health outcomes. Future research, using more rigorous methods, will better define these relationships and guide developers of new interventions.

Adherence to antiretroviral therapy: An update of current concepts

The remarkable effectiveness of combination antiretroviral therapy (CART) in the treatment of HIV infection has placed a high premium on long-term adherence to therapy. Adherence levels to CART among HIV-infected individuals are similar to adherence levels with chronic medical conditions, such as diabetes and hypertension. However, unlike chronic medical conditions, medication adherence that is insufficient to maintain suppression of HIV replication will lead to drug resistance. Combination antiretroviral therapy regimen complexity and side-effect burden are clearly linked to adherence and are likely to be the factors most amenable to intervention. Adherence interventions that are multifaceted, flexible, and protracted are the most likely to be successful. Owing to the great benefits of CART even the small to modest gains in adherence that are achievable with adherence programs may prove to be cost effective.

Literacy and health outcomes: a systematic review of the literature

OBJECTIVE

To review the relationship between literacy and health outcomes.

DATA SOURCES

We searched MEDLINE, Cumulative Index to Nursing and Allied Health (CINAHL), Educational Resources Information Center (ERIC), Public Affairs Information Service (PAIS), Industrial and Labor Relations Review (ILLR), PsychInfo, and Ageline from 1980 to 2003.

STUDY SELECTION

We included observational studies that reported original data, measured literacy with any valid instrument, and measured one or more health outcomes. Two abstractors reviewed each study for inclusion and resolved disagreements by discussion.

DATA EXTRACTION

One reviewer abstracted data from each article into an evidence table; the second reviewer checked each entry. The whole study team reconciled disagreements about information in evidence tables. Both data extractors independently completed an 11-item quality scale for each article; scores were averaged to give a final measure of article quality.

DATA SYNTHESIS

We reviewed 3,015 titles and abstracts and pulled 684 articles for full review; 73 articles met inclusion criteria and, of those, 44 addressed the questions of this report. Patients with low literacy had poorer health outcomes, including knowledge, intermediate disease markers, measures of morbidity, general health status, and use of health resources. Patients with low literacy were generally 1.5 to 3 times more likely to experience a given poor outcome. The average quality of the articles was fair to good. Most studies were cross-sectional in design; many failed to address adequately confounding and the use of multiple comparisons.

CONCLUSIONS

Low literacy is associated with several adverse health outcomes. Future research, using more rigorous methods, will better define these relationships and guide developers of new interventions.

Prevalence and correlates of nonadherence to antiretroviral therapy in a population of HIV patients using Medication Event Monitoring System

Nonadherence to antiretroviral therapy (ART) jeopardizes good clinical outcome in people living with HIV. In a single-center prospective study, prevalence and correlates of nonadherence were investigated in 43 patients on ART. Nonadherence was assessed using Medication Event Monitoring System (MEMS), self-report and collateral report of treating physicians. Based on MEMS data, median taking adherence, dosing adherence, and timing adherence was 98% (interquartile range [IQR] = 5.3), 91.5% (IQR = 18), and 86% (IQR = 31.5), respectively. The median number of drug holidays per 100 days was 0.8 (IQR = 4.8). The prevalence of nonadherence measured by MEMS was 40%. Self-reported nonadherence and collateral report of nonadherence by physicians varied from 5% to 41% and 24% to 28%, respectively. Patients were categorized as adherent or nonadherent based on a clinically validated algorithm derived from MEMS parameters. Nonadherent patients used significantly more escaping coping strategies (p = 0.003) and planned problem solving strategies (p = 0.049), were prescribed significantly more antiretroviral medications (p = 0.02) and were significantly longer on ART (p = 0.04) than adherent patients. Identified correlates of nonadherence may help clinicians in detecting patients with HIV at risk for nonadherence and can support the development of adherence enhancing interventions.

Pharmacologic Perspectives for Once-Daily Antiretroviral Therapy

OBJECTIVE

To contrast available once-daily antiretroviral agents and combinations of these agents from a clinical pharmacologic viewpoint.

DATA SOURCES

Data were extracted from publications and major HIV conference proceedings cited in MEDLINE (1966–March 2004) using the search terms antiretroviral therapy, combination therapy, once-daily therapy, and pharmacokinetics. Additional references were obtained from the bibliographies of these sources.

STUDY SELECTION AND DATA EXTRACTION

Information pertaining to pharmacologic perspectives for once-daily antiretroviral agents was selected.

DATA SYNTHESIS

Maximal and durable suppression of plasma HIV RNA, the principal goal of therapy, depends on the intrinsic antiviral activity of the antiretroviral regimen. A favorable tolerability/toxicity profile is also fundamentally important. All once-daily agents exhibit some pharmacologic limitations or lack adequate long-term follow-up. Of available agents, efavirenz has a long and distinguished efficacy record, with reasonable safety and moderate tolerability. Lamivudine, and newer agents such as atazanavir (or atazanavir/ritonavir), emtricitabine, fosamprenavir/ritonavir, and tenofovir, may offer pharmacologic advantages in the current state of once-daily therapy. Important considerations exist for coadministering once-daily agents including drug–drug interactions, drug–food incompatibilities, and synergistic toxicities. Few controlled studies have compared once-daily regimens with conventional regimens.

CONCLUSIONS

Progress has been made toward once-daily therapy, but more clinical experience with available agents is needed, including comparative studies of entirely once-daily regimens versus conventional regimens. Limitations of currently available agents signify a need for improved antiretroviral utilization or new alternative agents.

Better physician-patient relationships are associated with higher reported adherence to antiretroviral therapy in patients with HIV infection

BACKGROUND

There is little evidence to support the widely accepted assertion that better physician-patient relationships result in higher rates of adherence with recommended therapies.

OBJECTIVE

To determine whether and which aspects of a better physician-patient relationship are associated with higher rates of adherence with antiretroviral therapies for persons with HIV infection.

DESIGN

Cross-sectional analysis.

SETTING

Twenty-two outpatient HIV practices in a metropolitan area.

PARTICIPANTS

Five hundred fifty-four patients with HIV infection taking antiretroviral medications.

MEASUREMENTS

We measured adherence using a 4-item self-report scale (alpha= 0.75). We measured core aspects of physician-patient relationships using 6 previously tested scales (general communication, HIV-specific information, participatory decision making, overall satisfaction, willingness to recommend physician, and physician trust; alpha > 0.70 for all) and 1 new scale, adherence dialogue (alpha= 0.92). For adherence dialogue, patients rated their physician at understanding and solving problems with antiretroviral therapy regimens.

RESULTS

Mean patient age was 42 years, 15% were female, 73% were white, and 57% reported gay or bisexual sexual contact as their primary HIV risk factor. In multivariable models that accounted for the clustering of patients within physicians' practices, 6 of the 7 physician-patient relationship quality variables were significantly (P < .05) associated with adherence. In all 7 models worse adherence was independently associated (P < .05) with lower age, not believing in the importance of antiretroviral therapy, and worse mental health.

CONCLUSIONS

This study showed that multiple, mutable dimensions of the physician-patient relationship were associated with medication adherence in persons with HIV infection, suggesting that physician-patient relationship quality is a potentially important point of intervention to improve patients' medication adherence. In addition, our data suggest that it is critical to investigate and incorporate patients' belief systems about antiretroviral therapy into adherence discussions, and to identify and treat mental disorders.

Association between adherence to statin therapy and lipid control in Hong Kong Chinese patients at high risk of coronary heart disease

AIMS

To examine the pattern of adherence to statin therapy and to determine the association of adherence to statin therapy and the control of serum low-density lipoprotein (LDL)-cholesterol in a cohort of Hong Kong Chinese patients at high risk of coronary heart disease (CHD).

METHODS

This was a prospective observational cohort study conducted at the outpatient clinics of a public teaching hospital in Hong Kong. Patients at high risk of CHD who had been initiated on statin monotherapy for < 12 months were recruited. The statin prescription was dispensed in a bottle with the Medication Event Monitoring System (MEMS). Adherence was assessed in two dimensions: dose-count was defined as the percentage of doses taken, and dose-time was defined as the percentage of doses taken within the suggested time interval. Lipid profiles were obtained at baseline and during two follow-up visits at month 3 and month 6.

RESULTS

Eighty-three patients completed the study. The median adherence to dose-count and to dose-time were 95% (25-75th percentile = 87-99%) and 78% (25-75th percentile = 17-92%), respectively. Both dose-count and dose-time adherence declined slightly over the first 6 months of therapy. Living with family [relative risk (RR) = 0.79, 95% confidence interval (CI) 0.63, 0.91] and duration of therapy (RR = 0.99, 95% CI 0.98, 1.00) were negative predictors while number of family members (among those living with family) (RR = 1.05, 95% CI 1.00, 1.08) was a positive predictor for adherence to dose-count. Monthly household income (RR = 1.01, 95% CI 1.00, 1.02) and angina (RR = 1.29, 95% CI 1.05, 1.58) were positive predictors while living with family (RR = 0.74, 95% CI 0.55, 0.90) was a negative predictor for dose-time adherence. Percent reduction in serum LDL-cholesterol was correlated to dose-count (P < 0.001) and dose-time (P = 0.047) adherence. Statistically significant correlations were observed between adherence to dose-count and LDL reduction (R(2) = 0.130; P = 0.001), and between dose-time adherence and LDL reduction (R(2) = 0.048; P = 0.047).

CONCLUSION

High adherence to statin therapy was found in a cohort of Chinese patients at high risk of CHD and the adherence declined slightly over time. A weak association between adherence to statin dose-count and LDL reduction and a marginal association between dose-time adherence and LDL reduction were observed.

Gender differences in factors associated with adherence to antiretroviral therapy

OBJECTIVE

To identify gender differences in social and behavioral factors associated with antiretroviral adherence.

DESIGN

Prospective cohort study.

SETTING

Methadone maintenance program.

PARTICIPANTS

One hundred thirteen HIV-seropositive current or former opioid users.

MEASUREMENTS AND MAIN RESULTS

Participants were surveyed at baseline about social and behavioral characteristics and at monthly research visits about drug and alcohol use and medication side effects. Electronic monitors (MEMS) were used to measure antiretroviral adherence. Median adherence among women was 27% lower than among men (46% vs. 73%; P < .05). In gender-stratified multivariate models, factors associated with worse adherence in men included not belonging to an HIV support group (P < .0001), crack/cocaine use (P < .005), and medication side effects (P = .01). Among women, alcohol use (P = .005), heroin use (P < .05), and significant medication side effects (P < .005) were independently associated with worse adherence. In a model including both men and women, worse adherence was associated with lack of long-term housing (P < .005), not belonging to any HIV support groups (P < .0005), crack or cocaine use (P < .01), and medication side effects (P < .0005). In addition, worse adherence was associated with the interaction between female gender and alcohol use (P < or = .05).

CONCLUSIONS

In this cohort of current and former opioid users, gender-stratified analysis demonstrated that different social and behavioral factors are associated with adherence in men and women. Among both men and women, worse adherence was associated with lack of long-term housing, not belonging to an HIV support group, crack/cocaine use, and medication side effects. Among women only, alcohol use was associated with worse adherence.

Adherence to highly active antiretroviral therapy in the homeless population in San Francisco: a prospective study

BACKGROUND

We examined adherence to highly active antiretroviral therapy (HAART) in the homeless population, a population thought to be at high risk for poor adherence to therapy and for development of drug-resistant strains of human immunodeficiency virus (HIV).

METHODS

We performed a 12-month prospective study of 148 persons receiving HAART who were identified in a stratified screening of the homeless and marginally housed. We sampled in lunch lines, shelters, and hotels in 3 neighborhoods of San Francisco, California. We used pill counts at unannounced home visits as the primary measure of adherence.

RESULTS

Of 148 individuals sampled, 46 (31%) discontinued HAART during the study. Average adherence in the group of those who discontinued HAART was 51%, and 9% of these subjects had undetectable virus loads (i.e., <400 copies/mL) at the last follow-up visit. Predictors of discontinuation of therapy were depressive symptoms, injection drug use, African American ethnicity, and early poor adherence. Of 148 subjects, 102 (69%) continued to receive HAART throughout the study period. Average adherence in the group of those who continued to receive HAART was 74%, and 55% of these subjects had undetectable virus loads at the last follow-up visit. Predictors of lower average adherence in this group were African American ethnicity and use of crack cocaine; men who had sex with men had higher adherence.

CONCLUSIONS

One-third of homeless and marginally housed persons receiving HAART discontinued therapy during the follow-up period and would benefit from adherence interventions directed at sustaining therapy; two-thirds continued to receive therapy at adherence levels comparable to those found with other clinical populations.

Health-Related Quality of Life in HIV Patients Switching to Twice-Daily Indinavir/Ritonavir Regimen or Continuing with Three-Times-Daily Indinavir-Based Therapy

Objective

To evaluate health-related quality of life (HRQoL) changes in patients treated with indinavir three-times daily after switching to a twice-daily indinavir/ritonavir regimen or continuing with the same regimen.

Methods

Patients on HAART including indinavir three-times-daily with undetectable viral load were randomly assigned to continue with this therapy or to change to a twice-daily indinavir/ritonavir (800/100 mg) regimen. The Medical Outcomes Study HIV Health Survey (MOS-HIV) questionnaire was used as the HRQoL measure.

Results

A total of 118 patients participated in the study, of which 59 (50%) were randomly assigned to continue with the three-times-daily regimen. Patients had a mean age of 39 years and 80% of them were male. At baseline, subjects included in the three-times-daily group presented a significantly greater number of symptoms than subjects in the twice-daily group, but no statistically significant differences were observed in MOS-HIV scores between the groups. In the intention-to-treat (ITT) analysis, a reduction in HRQoL scores was observed in both groups, which was greater in the twice-daily group. In the per protocol analysis, reduction of HRQoL was minimal.

Conclusions

A HRQoL deterioration, greater in the twice-daily group, was observed in this study in the ITT analysis, while HRQoL remained stable in both groups in patients who continued with and tolerated the allocated regimen.

Alcohol consumption and antiretroviral adherence among HIV-infected persons with alcohol problems

BACKGROUND

Alcohol abuse has been associated with poor adherence to highly active antiretroviral therapy (HAART). We examined the relative importance of varying levels of alcohol consumption on adherence in HIV-infected patients with a history of alcohol problems.

METHODS

We surveyed 349 HIV-infected persons with a history of alcohol problems at 6-month intervals. Of these subjects, 267 were taking HAART at one or more time periods during the 30-month follow-up period. Interviews assessed recent adherence to HAART and past month alcohol consumption, defined as "none", "moderate", and "at risk". We investigated the relationship between adherence to HAART and alcohol consumption at baseline and at each subsequent 6-month follow-up interval using multivariable longitudinal regression models, while controlling for potential confounders.

RESULTS

Among the 267 HIV-infected persons with a history of alcohol problems who were receiving HAART, alcohol consumption was the most significant predictor of adherence (p < 0.0001), with better adherence being associated with recent abstinence from alcohol, compared with at-risk level usage (odds ratio = 3.6, 95% confidence interval = 2.1-6.2) or compared with moderate usage (odds ratio = 3.0, 95% confidence interval = 2.0-4.5).

CONCLUSIONS

Any alcohol use among HIV-infected persons with a history of alcohol problems is associated with worse HAART adherence. Addressing alcohol use in HIV-infected persons may improve antiretroviral adherence and ultimately clinical outcomes.

Enhancing adherence to long-term medical therapy: a new approach to assessing and treating patients

Poor adherence to medical therapy may cause as much as dollar 100 billion in unnecessary healthcare expenses each year. Nonadherence is a complicated and dynamic problem that involves patient, medication, and prescriber factors. The Case Management Adherence Guidelines (CMAG-1) are an evidence-based algorithm that introduces concepts and strategies for assessing medical knowledge and readiness to change (motivational interviewing). Once the assessment has been made, the guidelines can be used regularly to help patients become and remain adherent to their medication regimens. CMAG-1 and its tools, based on up-to-date information about adherence and ways to promote behavioral change, are designed to identify motivational and knowledge deficiencies that may block adherence. As information accumulates from centers that use it, CMAG-1 will be modified accordingly, with the goal of creating structured interaction with patients that will increase their knowledge and motivation to take medication appropriately.

Factores predictores de carga viral detectable en pacientes en tratamiento antirretroviral de gran actividad

BACKGROUND AND OBJECTIVE

Knowledge of the variables predicting detectable viral load in patients with highly active antiretroviral treatment.

PATIENTS AND METHOD

Observational and cross-sectional study in patients with antiretroviral treatment receiving two nucleoside reverse transcriptase inhibitors and one protease inhibitor. Several sociodemographic and clinic variables were registered. Two models were designed in order to assess the adherence: I. combining self-report and pharmacy criteria, and II. including drug plasma levels in adherent patients with the two former criteria and detectable viral load. Logistic regression analysis with variables found to be associated with detectable viral load in the univariate analysis, diagnostic algorithm and ROC statistics were performed in order to select the best model to predict detectable viral load.

RESULTS

Among of 136 patients studied, 39 (28.7%) had detectable viral load. Patients less than 35 years old (OR = 2.68), intravenous drug users or heterosexual contacts as the way of HIV infection (OR = 6.42), patients not fully convinced of the capacity of mutation of the HIV by poor adherence (OR = 3.25) and patients considered non-adherent according to the drug plasma levels criteria (OR = 6.91) had more frequently detectable viral load. The best model to predict detectable viral load would include patients considered non-adherent according to the two models used, and moreover, patients where another of the factors of risk were detected; the prevalence of detectable viral load in these was of 10% versus 43%.

CONCLUSION

Adherence to HAART is a key factor to predict detectable viral load, specially in young patients, infected by intravenous drug use or heterosexual contacts, and patients not convinced of the importance of the adherence.

Drug resistance and adherence to HIV/AIDS antiretroviral treatment: against a double standard between the north and the south

Here we review the available evidence on adherence to highly active antiretroviral therapy (HAART) and its relationship with the risk of the dissemination of HIV-resistant viral strains in both developed and developing countries. We argue that referring to these issues of resistance and adherence to withhold or delay access to HAART in developing countries implicitly imposes a double standard of thinking that is unacceptable. Scaling-up access to HAART to succeed in low-resource settings, however, requires the long-term monitoring of adherence as well as the clarification of the complex trade-offs between minimizing the costs of therapeutic regimens and minimizing the risks of non-adherence and resistance.

Psychosocial factors associated with adherence to antiretroviral medications in a sample of HIV-positive African American drug users

The purpose of the study was to investigate factors affecting antiretroviral adherence among African American drug users, specifically to identify associations between self-reported adherence levels and psychosocial measures selected with guidance from the Transactional Model of Stress and Coping (TMSC). The study was conducted using data collected from 137 HIV-positive African American drug users who were receiving antiretroviral medications at the time they were interviewed. Bivariate associations were investigated using correlational analyses and variables showing a significant correlation with adherence were entered into a multivariate regression model. The multivariate model showed only perceived efficacy of antiretrovirals and one measure of perceived barriers, simply forgetting to take medications, were independently related to adherence. These preliminary findings suggest that theoretical approaches to understanding antiretroviral adherence must address a range of variables, including but not limited to behavioural practices, cognitive appraisals, affective responses and social support. Further studies using the complete TMSC are recommended.

Brief motivational interviewing to improve adherence to antiretroviral therapy: development and qualitative pilot assessment of an intervention

Because successful HIV treatment requires exceptional adherence to antiretroviral therapy (ART), interventions to improve ART adherence are essential. We developed and pilot-tested an intervention to improve ART adherence, based on brief motivational interviewing (MI), which has successfully improved selected health behaviors but has not been tested for ART adherence. We administered the 15- to 30-minute MI session to 20 HIV-positive adults and assessed its usefulness and relevance. Then, we content-analyzed the session for HIV care issues and strategies most salient to patients in the MI session. During the session, all participants chose an HIV-care-related topic that they wanted to discuss, and talked about issues, barriers, and facilitators related to their topic. Most participants (70%) developed strategies to help improve their health. Questions asked after the MI session revealed that almost all (95%-100%) participants found the session useful and helpful. This theoretically based, empowering health counseling approach for HIV-positive persons warrants further research.

The impact of reducing dose frequency on health outcomes

BACKGROUND

Dosing schedules may be one important factor determining whether patients take their prescribed medication. Schedules may influence whether a patient stays on the prescribed therapy and, if so, the degree to which the regimen is followed. Both factors are important determinants of health outcomes and health care costs.

OBJECTIVE

The goal of this study was to investigate the impact of reducing dose frequency on health outcomes and health care costs.

METHODS

Articles from peer-reviewed journals were identified from the medical literature databases MEDLINE, International Pharmaceutical Abstracts, and HealthSTAR for the years 1985 through 2002. The search included all references that reported on the impact of a change of dose frequency on chronic disease. Search terms used were combinations of dose frequency, dose schedule, and dosing and efficacy, safety, clinical effectiveness, preferences, adherence, compliance, persistence, health-related quality of life, patient satisfaction, resource use, and costs.

RESULTS

Reducing the number of daily doses through extended-release formulations or newer drugs has frequently been shown to provide the patient with better symptom control in a number of disease states. Overall improvements were seen in adherence, patient quality of life, patient satisfaction, and costs. However, results of some studies indicate that not all patients, medications, or diseases may be candidates for reduced dosing due to the potential effects on symptom control, incidence of adverse events, and overcompensation for missed doses.

CONCLUSION

Where feasible, reducing dose frequency may offer benefits for the patient in terms of health outcomes and for the health care budget holder in terms of costs.

Are untimed antiretroviral drug levels useful predictors of adherence behavior?

We examined cross-sectionally the relationship between untimed drug levels and adherence in 83 individuals. Abnormally low untimed antiretroviral drug levels were sensitive in identifying individuals adherent to 60% or less of medication doses over 3 - 5-week period. An abnormally low drug level was associated with a higher viral load. A single abnormally low untimed antiretroviral drug level can identify an individual with very low adherence at high risk of HIV disease progression and death.

Patterns of adherence to antiretrovirals: why adherence has no simple measure

The goal of this study was to explore patterns and explanations of adherence to antiretroviral therapies from the patient's perspective. It consisted of 78 in-depth interviews with patients attending an HIV clinic in New Orleans, Louisiana, to whom combination therapy had been prescribed. Interviews explored patient's definitions of adherence, beliefs about consequences of nonadherence, reasons for current and past adherence behavior, and contextual issues such as drug and alcohol use and social support. Respondents reported nine distinct patterns of adherence, which they perceived to have different consequences and causes. These patterns hid variations because respondents could have more than one pattern simultaneously and patterns were not stable over time. Although there are gold standards for adherence measurement, such as directly observed therapy, these measurements are most frequently used to classify respondents as adherers or nonadherers based on whether they take a certain percentage of their medication. Such a categorization is simplistic and does not reflect the complexity of adherence patterns.

Medication adherence practices of HIV/AIDS case managers: a statewide survey in North Carolina

The primary objective of this study was to examine the adherence-related practices and attitudes of HIV/AIDS case managers in North Carolina. All North Carolina HIV/AIDS case managers (n = 111) employed by agencies that were state certified to provide HIV case management were sent an adherence counseling survey. Negative binomial regression was used to examine the relationship of case managers' characteristics and attitudes with their medication adherence counseling practices. Of the 94 HIV/AIDS case managers who responded to the survey, the majority (65%) reported discussing medications with almost every client. The adherence-related behaviors that case managers most frequently provided were related to monitoring medication usage rather than providing medication instruction. Most case managers believed that medication adherence counseling is part of their role (77%); however, a substantial minority, (36%) did not believe that their adherence counseling skills were adequate. Multivariate analysis revealed that case managers who provided more adherence counseling services reported greater confidence in their adherence counseling skills, believed that adherence counseling is a HIV/AIDS case management role, and had a higher proportion of substance-abusing clients in their caseload. The adherence counseling activities of HIV/AIDS case managers can potentially supplement the counseling provided by other health professionals and promote greater adherence to medications. However, variability in perceived skills and adherence-related activities suggests that the role of case managers in medication adherence counseling needs to be better defined and appropriate training provided to meet the expectations of this role.

Factors that influence adherence to HIV medications: perceptions of women and health care providers

The purpose of this pilot study was to explore factors that influence adherence to antiretroviral therapy (ART) in women with human immunodeficiency virus (HIV) disease. Antiretroviral medications that reduce viral count and prolong the time between a diagnosis of HIV disease and acquired immunodeficiency syndrome (AIDS) are expensive, numerous, and have multiple side effects. Common reasons for not adhering to the medication regimen include ART side effects and a dosage schedule that disrupts daily activities. Failure to take or errors in taking ART can result in an exacerbation of symptoms and disease progression or the development of drug-resistant strains of HIV. Women and providers in separate focus groups identified factors that facilitated and hindered adherence to ART. Knowledge of factors that influence adherence to ART will facilitate the development of interventions. Patient-provider relationships and side effects of weight gain are discussed as factors that influence adherence to ART.

A family group approach to increasing adherence to therapy in HIV-infected youths: results of a pilot project

This paper describes the development of a novel, pilot program in which a combined family group and peer approach were used to increase adherence to antiretroviral therapy in HIV-infected youths. Twenty-three HIV-positive youths, 15-22 years of age and 23 family members or "treatment buddies" participated in one of three 12-week programs. The intervention had six biweekly family and youth education sessions and six biweekly youth-only education sessions. Devices to increase adherence to antiretroviral therapy such as pill boxes, calendars, and watch alarms were introduced at youth-only sessions. Eighteen of the 23 youths completed a group. Ninety-one percent of youths self-reported increased adherence to medications after completion of a group. Four participants experienced a one-log reduction in viral loads to undetectable levels during the intervention. Two participants continued to decline antiretroviral medications at the end of the intervention and demonstrated no decrease in viral load. Participants tested five devices and rated the multiple alarm watch as the best aid for improving adherence to medication. Family/treatment buddies rated the overall program as highly helpful, citing social support as most valuable. An unanticipated benefit was an increase in other health behaviors, including medical and dental appointments, hepatitis B and influenza immunizations, and referrals to mental health and substance abuse treatment.

Knowledge of antiretroviral regimen dosing and adherence: a longitudinal study

In a cohort of 128 human immunodeficiency virus-infected patients, we found that patients' knowledge of antiretroviral dosing was suboptimal at regimen initiation but improved with time. Poor medication knowledge 8 weeks after regimen initiation was associated with lower adherence and with a lower level of literacy in a multivariate model (P=.03). Because knowledge deficits are common after antiretroviral regimen initiation, clinicians should assess patients' understanding of medication dosing soon after regimen initiation or change.