Abstract
We sought to investigate the association between hazardous alcohol use and gaps in care for people living with HIV over a long-term follow-up period. Adults who had participated in our previously published Phase I study of hazardous alcohol use at HIV programs in Kenya and Uganda were eligible at their 42 to 48 month follow-up visit. Those who re-enrolled were followed for an additional ~ 12 months. Hazardous alcohol use behavior was measured using the Alcohol Use Disorders Identification Test (AUDIT) tool. Deidentified clinical data were used to assess gaps in care (defined as failure to return to clinic within 60 days after a missed visit). The proportion of patients experiencing a gap in care at a specific time point was based on a nonparametric moment-based estimator. A semiparametric Cox proportional hazard model was used to determine the association between hazardous alcohol use at enrollment in Phase I (AUDIT score ≥ 8) and gaps in care. Of the 731 study-eligible participants from Phase I, 5.5% had died, 10.1% were lost to follow-up, 39.5% transferred, 7.5% declined/not approached, and 37.3% were enrolled. Phase II participants were older, had less hazardous drinking and had a lower WHO clinical stage than those not re-enrolled. Hazardous drinking in the re-enrolled was associated with a Hazard Ratio (HR) of 1.88 [p-value = 0.016] for a gap in care. Thus, hazardous alcohol use at baseline was associated with an increased risk of experiencing a gap in care and presents an early target for intervention.
Resumen
Buscamos investigar la asociación entre el uso riesgoso de alcohol y retención en programas de VIH a largo plazo. Todo adulto que participó en nuestro estudio previamente publicado sobre el uso riesgoso de alcohol en programas de VIH en Kenia y Uganda era elegible a los 42 a 48 meses de seguimiento. Los adultos reinscritos en la fueron seguidos por ~ 12 meses adicionales. Usamos el “Alcohol Use Disorders Identification Test” (AUDIT) para medir uso de alcohol. Usamos datos clínicos anonimizados para evaluar interrupciones en cuidado (definido como falta de regresar a clínica 60 días después de faltar a una cita). Basamos la proporción de pacientes con una interrupción en cuidado clínico en un estimador momentáneo y no-paramétrico. Determinamos la asociación entre el uso riesgoso de alcohol al inicio de la primera fase (puntuación AUDIT ≥8) con retención en servicios clínicos usando un modelo de riesgo Cox semiparamétrico. De los 731 participantes elegibles, 5.5% habían muerto, 10.1% fueron perdidos a seguimiento clínico, 39.5% se transfirieron a otro programa, 7.5% declinaron participación o no fueron reclutados y 37.3% fueron reinscritos en la segunda fase. Los participantes reinscritos eran mayores, tenían menos uso riesgoso de alcohol y tenían VIH menos avanzado. El uso peligroso del alcohol se vio asociado con el riesgo de tener una interrupción en cuidado clínico [Proporción de Riesgo (Hazard Ratio, HR) PR=1.88, valor-p = 0.016]. Por lo tanto, el uso peligroso del alcohol incrementa el riesgo de perder seguimiento clínico y presenta una oportunidad para intervención.
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Introduction
Alcohol use is one of the top ten risk factors for overall global disease burden and precipitates mortality from both communicable and non-communicable diseases [1]. For people living with HIV (PLHIV), alcohol consumption exacerbates comorbidities and can disrupt the HIV care cascade at various points [1,2,3,4,5,6,7]. In the United States (U.S), 51–63% of PLHIV consume alcohol and 15–25% are “heavy drinkers”, consuming alcohol at twice the rate of the general population [8,9,10]. Studies from western and southern Africa have reported more variability in the prevalence of alcohol consumption among PLHIV, with rates ranging between 10–52% for any alcohol use and 2.6–30% for consumption above recommended limits (hazardous or disordered drinkers) [10,11,12,13,14,15,16]. Since alcohol use patterns vary greatly between countries and have important ramifications for HIV care provision, it is vital to understand the landscape of alcohol use in East Africa and characterize its impact on the HIV care cascade.
Alcohol consumption correlates with higher viral loads at enrollment, longer delays in antiretroviral treatment (ART) initiation and worse adherence to ART once engaged in care [6, 12, 14, 17]. The link between alcohol use and health care utilization, however, is less clear. In one study conducted in the U.S., heavy alcohol use had no impact on outpatient HIV care visits for a nationally representative sample of PLHIV. However, it was associated with fewer clinic visits for an at-risk cohort with a higher proportion of patients from minority groups with low socio-economic status, unemployment, homelessness, lack of insurance and illicit drug use [18]. Other studies conducted at HIV clinics in Nigeria and the U.S. have reported no significant association between heavy drinking and outpatient HIV clinic visit attendance [14, 19]. On the other hand, two separate studies from South Africa and the U.S. found that heavy alcohol use at enrollment led to worse retention in HIV care at six and 12 months, respectively [9, 11]. In 2020, Patsis et al. published an observational study for our group of ART-naïve patients accessing care in Kenya and Uganda, in which 41.6% of the cohort consumed alcohol, 26.7% were hazardous drinkers (Alcohol Use Disorder Identification Test (AUDIT) score ≥ 8) and 16% were hyper drinkers (AUDIT score ≥ 16) [20]. In this cohort, any alcohol consumption was associated with a 25% lower likelihood of ART initiation in the pre-Treat All era, and a 77% higher risk of non-retention in care [20]. Thus, findings related to the impact of alcohol use on retention in the HIV care cascade vary across populations and settings. Our understanding of these relationships is limited by sparse data on the association between alcohol use and long-term retention in HIV care, especially in low- and middle-income countries (LMICs).
To better understand the long-term clinical impact of alcohol use patterns at time of enrollment into HIV care, we followed-up participants from the Alcohol Use Assessment Sentinel Cohort (AUAC) originally described by Patsis et al. [20]. The AUAC was a prospective study of adults (> = 18 years) enrolling in HIV care at one of the five participating East Africa International Epidemiology Databases to Evaluate AIDS (EA-IeDEA) sites between January 25, 2013, and June 25, 2014 (Phase I). Baseline characteristics, recruitment details, and competing risk analysis for loss to follow-up and death were reported by Patsis et al. [20], and major findings are summarized in the paragraph above. In this study, we present results for Phase II of the same cohort. The primary outcome was likelihood of experiencing a gap in care at a median 48.7 months after enrollment in Phase II (range: 40.7 to 61.2 months). We also present the longitudinal analysis for Phase II of our study, which includes clinical outcomes and risk of experiencing a gap in care at approximately 12 months after re-enrollment into the long-term portion of the study (median 11.5 months; range: 6.0 to 26.1 months). In addition, we present how alcohol use disorder patterns changed over this time by assessing change in AUDIT from enrollment in Phase I and throughout the Phase II follow-up period. Our results provide insight into factors present at enrollment that can affect the success of HIV care programs in the long-term.
Methods
Study Design
The original AUAC cohort was enrolled between January 25, 2013, and June 25, 2014 (Phase I) and short-term outcomes were described by Patsis et al. [20]. For the present study, the goal was to approach Phase I participants for re-enrollment in a second phase of the study approximately 42 to 48 months post-enrollment in Phase I and to follow them for an additional 12 months. However, due to delays in regulatory approval at some sites, there were staggered study initiation dates and a wide range of follow-up periods. In the end, participants were approached at a median of 48.7 months post-enrollment in Phase I for re-enrollment in Phase II (range 40.7—61.2 months). Participants opting into Phase II were followed for an additional median duration of 11.5 months from July 27, 2017 to July 5, 2018 (range 6.0–26.1 months). Data for Phase I participants who did not enroll into Phase II were reviewed at the initiation of Phase II to determine engagement status. For Phase II participants, our primary outcome was risk of experiencing a gap in care during the long-term follow-up period. Our primary exposure was the AUDIT questionnaire score at enrollment into Phase I (details of the questionnaire are described in further detail under Study Procedures). Only participants who consented to participation in both Phase I and Phase II were included in the longitudinal analysis. Our secondary outcome was change in AUDIT score at the time of enrollment in Phase II (median 48.7 months post enrollment in Phase I, range: 40.7–61.2 months).
The study was approved by the Indiana University Institutional Review Board and the ethical bodies affiliated with each participating site: The Academic Model Providing Access to Healthcare (AMPATH): Moi University College of Health Sciences and MOI Teaching and Referral Hospital’s Institutional Research and Ethics Committee; Kenya Medical Research Institute (KEMRI) affiliated sites: KEMRI National Ethics Review Committee; Mbarara Immune Suppression Syndrome (ISS) Clinic: Mbarara University of Science & Technology Institutional Review Committee and Uganda National Council of Science and Technology (UNCST). All participants were consented at enrollment and again before starting Phase II of the study.
Study Setting
Five clinics within the EA-IeDEA consortium participated in this study: Two KEMRI affiliated clinics (Kisumu and Homa Bay, Kenya); two AMPATH clinics (Eldoret, Kenya); and the ISS in Mbarara, Uganda. The sites in Eldoret and Kisumu are primarily urban. Suba District Hospital in Homa Bay is rural and Mbarara is semi-urban. All the clinics provide comprehensive HIV care according to their country’s National Guidelines.
Study Population and Sample Size
All adult patients (≥ 18 years old) who were ART-naïve at the time of initial encounter and presented for HIV care at one of the above clinics were eligible for participation in Phase I of the study [20]. Patients were referred for enrollment by their clinician and consented for participation. All patients enrolled in Phase I were eligible for participation in Phase II except for 38 participants who were misclassified as ART-naïve in Phase I. A detailed flowchart for patient enrollment in both phases is included in Fig. 1.
Study Procedures
The initial phase of the study collected baseline characteristics, demographic information, and hazardous alcohol use behavior via the AUDIT questionnaire, which was repeated at the Phase II visit [20, 21]. The AUDIT questionnaire was completed in English, Swahili, Luo or Rukiga/Runyankole, depending on a participant’s preferred language.
Study Measures
The AUDIT is a 10-question instrument that asks about hazardous alcohol use patterns, with higher scores indicating a greater risk of having an alcohol use disorder [21]. The AUDIT questionnaire has been validated for our setting. The first three questions inquire about present alcohol use; if a patient scored 0 on these first three questions (no alcohol consumption), then subsequent questions were not asked. With a maximum total score of 40 points, a score ≥ 8 was classified as hazardous drinking, while a score ≥ 16 was classified as hyper drinking. These terms were defined in our prior paper and are used for ease of discussing individuals with AUDIT scores equal to or greater than 8 and 16, respectively [20]. All patients received a pamphlet on HIV and Alcohol Consumption after each administration of the AUDIT regardless of AUDIT score. AUDIT scores were also shared with clinical officers to inform clinical care.
Data Collection and Management
Study data were collected on paper Case Report Forms (CRFs) and then transferred to a password-protected REDCap database (developed by the East Africa IeDEA Regional Data Center [EA-RDC]) by the research assistants. Data collected as part of the routine clinic visit, such as demographic information, CD4 counts, viral loads, and WHO disease stage were extracted from the electronic medical record and entered into REDCap. All stored data were de-identified with CRFs using only study identification numbers (ID) for reference. The EA-RDC used separately stored study ID mapping files to confirm patient linkage. After data were linked, comprehensive data quality procedures were performed, including verification of value ranges, categorization of variables, and consistency checks across the data sources. All queries resulting from these procedures were investigated at each site and updated accordingly in the study database prior to analysis.
Statistical Analysis
Categorical variables were described using frequencies and proportions. Descriptions of the quantitative variables were based on the median and interquartile range (IQR). Two-sample comparisons of categorical variables were based on Pearson’s chi-squared test. The nonparametric Mann–Whitney test was used to perform two-sample comparisons for the quantitative variables. The main outcomes of interest were gaps in care after enrolling in Phase II. A gap in care was defined as no attendance for more than 60 days after a scheduled visit was missed. Because our clinic visits are associated with pharmacy refills, failure to return to clinic for more than 60 days after a missed appointment would be associated with a 60-day gap in access to ART [22, 23]. The conceptual multistate model of patient “churning” in and out of care has been described in previous manuscripts [24, 25]. This model captures the dynamic nature of the disengagement and re-engagement back in the care process. The goal of this analysis is to estimate the proportion of patients experiencing a gap in care at a specific point in time. The estimation of these quantities over time was based on a nonparametric moment-based estimator [26]. This estimator accounts for both the potential within-clinic correlation of patient outcomes and right censoring, defined as being alive by the end of the follow-up period. Unlike a traditional Kaplan–Meier survival curve which would depict the cumulative probability of just being gap-in-care-free, our approach provides an estimate of being in a gap in care at each timepoint throughout the entire follow-up period. This estimate incorporates all the gap in care events observed for each patient (not just the first one) and, also, the duration of each gap in care. Thus, it efficiently depicts the entire gap in care event history in our population. The probability of having a gap in care was statistically compared between those with and without hazardous drinking behavior at enrollment using a linear nonparametric two-sample test [27, 28]. To adjust for the lack of independence within clinics, variance estimation for the latter test statistic was performed using nonparametric cluster bootstrap at the clinic level, with 1000 replications [26]. To evaluate the effect of hazardous drinking on the rates of gap in care, while accounting for potential confounders, we fitted a semiparametric Cox proportional hazards model for recurrent events that incorporates all the gap in care events observed for each patient (and not just the first event). By analyzing all the observed gap in care events, we can obtain more precise effect estimates and achieve more powerful statistical hypothesis tests. The potential correlation of recurrent gaps in care for the same patient was taken into account using an appropriate sandwich-type variance estimator. Due to the small number of clinics, we accounted for the potential association between patients from the same clinic by incorporating clinic as a categorical covariate in the Cox model [29].
A secondary outcome was a change in alcohol consumption behavior between enrollment and the Phase II visit. We chose this outcome to explore whether engaging in the care continuum impacts alcohol use behavior. As in Phase I, patient AUDIT scores were classified into consumption categories, then designated by comparison to Phase I as “same”, “higher”, or “lower”. This categorical change in alcohol consumption behavior was analyzed using multinomial logistic regression. Like the multivariable analyses of gaps in care, the potential within-clinic dependence was accounted for by incorporating clinic as a categorical covariate in the model.
Results
Patient Characteristics
Of the 731 Phase I participants identified as eligible for re-enrollment in Phase II, 40 (5.5%) had died, 74 (10.1%) were lost-to-follow-up (LTFU) and 289 (39.5%) had transferred to a non-study facility (Fig. 1). This resulted in a total of 328 patients being eligible for enrollment in Phase II, of whom 55 (7.5%) declined participation or were not approached. Participants were enrolled in Phase II at a median of 48.7 months (range 40.7–61.2 months) after enrollment in Phase I. The baseline characteristics of individuals enrolling in Phase II (N = 273), not enrolling (N = 458), and the total Phase I cohort (N = 731) are outlined in Table 1. Those enrolled versus not enrolled in Phase II were similar in terms of sex distribution, CD4 cell count, and HIV-disclosure status. However, Phase II participants were more likely to be older, have a lower AUDIT score and a lower enrollment WHO clinical stage and were less likely to be enrolled at Mbarara, as compared to those participating in Phase I but not Phase II.
Most Phase II participants were female (65%) and the median age was 33.5 (IQR: 26.8, 41.7) years (Table 1). At baseline, the median CD4 cell count was 327 (IQR: 165, 511), most had a WHO Clinical Stage of 1 or 2 (86.4%) and most (60.2%) had not disclosed their HIV status. Participants were predominantly enrolled from KEMRI (39.9%) and AMPATH (38.8%) affiliated sites compared to Mbarara (21.2%). The baseline AUDIT for those enrolling in Phase II identified hazardous drinking behavior in 66 participants (24.2%; AUDIT score ≥ 8), moderate drinking in 35 participants (12.8%; AUDIT ≥ 1 and \(\le \) 7), and no alcohol use in 172 participants (63.0%). On repeat AUDIT hazardous drinking behavior was identified in 51 participants (18.7%), moderate drinking in 26 participants (9.5%), and no alcohol use in 196 participants (71.8%). The majority (61%) had no change in AUDIT score while 28% had a reduced score and 11% had a higher score.
Patient Churn and Retention in Care
For patients enrolled in Phase II, AUDIT score at time of enrollment in Phase I was used as the main predictor for experiencing a gap in care. The multistate churn model identified that the probability of a gap in care over time differs between those with and without a baseline AUDIT score indicating hazardous drinking (Fig. 2; z = 4.08, p-value < 0.001). In fact, without adjusting for potential confounders, those with hazardous drinking at enrollment in Phase I were more likely to have a gap in care at almost every time point during the long-term follow-up period.
The multivariable analysis of the hazard of a gap in care is presented in Table 2. Hazardous drinking at baseline remained associated with an increased hazard of a gap in care [Hazard Ratio (HR) = 1.88, z = 2.415, p < 0.05], after accounting for age, gender, site, HIV status disclosure, and WHO stage at enrollment.
Change in AUDIT Score
Since hazardous alcohol use behavior was the main risk factor used for predicting the likelihood of a gap in care, change in AUDIT score throughout the study period was examined. Marginal multinomial logistic regression was used to evaluate qualitative changes in hazardous alcohol use (AUDIT score) between time of enrollment in Phase I and time of follow-up assessment during Phase II (median 11.5 months post enrollment in Phase II; range: 6.0–26.1 months). Table 3 presents the results of the multivariable analysis of the categorical change in alcohol consumption. There appears to be a trend toward males being more likely to change their alcohol use behaviors relative to maintaining the same drinking behavior as compared to females, though results were not statistically significant. Participants with a disclosed HIV status at baseline were more likely to increase (RRR = 4.19, z = 2.16, p < 0.05) their alcohol use.
Discussion
Our study utilized the multi-state churn model to assess the risk of experiencing a gap in care for participants with and without hazardous drinking. Over the long-term follow-up period, participants with a history of hazardous drinking at baseline had nearly a 90% higher hazard of having a gap in care leading to a gap in ART. Consequences of such gaps in ART include viral rebound, viral resistance, and immune suppression [30]. As such, our findings provide a risk factor that is present at enrollment and could be a target for intervention to improve patient outcomes. Our findings expand on results for the same cohort that showed lower rates of ART initiation at diagnosis and worse retention at short-term follow-up for participants with any history of alcohol consumption [20]. Prior studies from care settings in various countries have demonstrated an association between alcohol use behavior and disengagement from care [11, 31, 32]. Fewer studies have examined missed appointments or gaps in care during a follow-up period, especially in Africa. Notably, a study by Monroe et al. at multiple sites in the U.S. found that alcohol use was associated with both long-term disengagement in care and with having more missed appointments [9]. Another study from Uganda demonstrated that individuals with higher AUDIT scores had a higher rate of missed appointments [33]. Thus, knowing a patient’s alcohol use pattern at baseline can aid in developing a multi-component approach to avoiding gaps in care by prompting early referral to alcohol cessation services.
Interestingly, our study found that participants with a disclosed HIV status were more likely to have an increase in their AUDIT score over time, placing them at higher risk for experiencing a gap in care. HIV status disclosure is a necessary step to receive social support, but it also creates an avenue for discrimination and stigma [34]. It is possible that participants who disclose their HIV status experience more stigma, and thus increase maladaptive coping behaviors, such as alcohol use and appointment non-adherence. A study by Wardell et al. found that maladaptive coping is a mediator between perceived stigma and heavy alcohol use [35]. Alternatively, participants with hazardous alcohol use may simply be more likely to disclose their HIV status. A study by Modi et al. found that participants who had accessed alcohol cessation services in the last six months had higher rates of broad disclosure of their HIV status [36]. Interventions to reduce gaps in care must consider a wide array of risk factors, including social support systems, experienced stigma, substance use and patient coping behaviors.
The main strength of our study is its long-term follow-up of a large cohort of participants from three programs in East Africa. Given the common mission of HIV care programs of retaining participants in care over their lifetime, this study adds valuable information about factors that may contribute to gaps in care. The limitations of our study center on the high number of participants who were LTFU or transferred to a different site prior to enrollment in Phase II, as the long-term outcomes of those participants could not be assessed. The sample in Phase II is biased toward individuals likely to remain in care due to the high LTFU rate prior to its initiation. As for the 40% of the Phase I cohort that transferred to a non-study facility before initiation of Phase II, it is difficult to predict how this may have impacted the results. It is worth noting that 83% of participants who were retained at their program of initial enrollment in Phase I re-enrolled in Phase II. However, the enrolled individuals in Phase II had lower mean baseline AUDIT scores than the non-enrolled individuals. As such, within this study we are likely underestimating the impact of hazardous alcohol use on engagement in care.
Conclusion
Our study found that hazardous alcohol use was associated with gaps in care at sites in East Africa, identifying it as an important indicator of participants who may benefit from additional interventions and social support. Integrating alcohol screening and subsequent protocols for referral to alcohol treatment programs is a key component to improving health outcomes for PLHIV and ensuring their continued connection to the care system.
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Funding
Research reported in this publication was supported by the National Institute Of Allergy And Infectious Diseases (NIAID), Eunice Kennedy Shriver National Institute Of Child Health & Human Development (NICHD), National Institute On Drug Abuse (NIDA), National Cancer Institute (NCI), and the National Institute of Mental Health (NIMH), National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) , Fogarty International Center (FIC), National Heart, Lung, and Blood Institute (NHLBI) , National Institute on Alcohol Abuse and Alchoholism (NIAAA), in accordance with the regulatory requirements of the National Institutes of Health under Award Number U01AI069911 East Africa IeDEA Consortium. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
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Conceptualization: Alexa Monroy, Suzanne Goodrich, Beverly S. Musick, Kara K. Wools-Kaloustian. Data curation: Steven A. Brown. Formal analysis: Theofanis Balanos, Giorgos Bakoyannis. Funding acquisition: Kara K. Wools-Kaloustian, Constantin T. Yiannoutsos. Investigation: Suzanne Goodrich, Lameck Diero, Jayne L. Kulzer, Helen Byakwaga. Methodology: Giorgos Bakoyannis, Theofanis Balanos, Constantin T. Yiannoutsos. Project administration: Suzanne Goodrich. Resources: Lameck Diero, Jayne L. Kulzer, Helen Byakwaga, Patrick Oyaro, Kara K. Validation: Suzanne Goodrich, Jayne L. Kulzer, Helen Byakwaga, Kara K. Wools-Kaloustian. Writing—original draft: Alexa Monroy, Giorgos Bakoyannis, Theofanis Balanos. Suzanne Goodrich, Constantin T. Yiannoutsos, Beverly S. Musick, Kara K. Wools-Kaloustian. Writing—review & editing: Alexa Monroy, Giorgos Bakoyannis, Theofanis Balanos. Suzanne Goodrich, Constantin T. Yiannoutsos, Steven A. Brown, Beverly S. Musick, Lameck Diero, Jayne L. Kulzer, Helen Byakwaga, Kara K. Wools-Kaloustian.
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Alexa Monroy, Suzanne Goodrich, Kara Wools-Kaloustian, Giorgos Bakoyannis, Steven Brown, Theofanis Balanos, Lameck Diero, Helen Byakwaga, Winnie Muyindike, Michael Kanyesigye, Maurice Aluda, Jayne Lewis-Kulzer, Constantin Yiannoutsos have not disclosed any competing interests.
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This prospective observational study was approved by the Indiana University Institutional Review Board and the ethical bodies affiliated with each participating site: The Academic Model Providing Access to Healthcare (AMPATH): Moi University College of Health Sciences and MOI Teaching and Referral Hospital’s Institutional Research and Ethics Committee; Family AIDS Care and Education Services (FACES): Kenya Medical Research Institute/National Ethics Review Committee; Mbarara Immune Suppression Syndrome (ISS) Clinic: Mbarara University of Science & Technology Institutional Review Committee and Uganda National Council of Science and Technology (UNCST) Participant written informed consent was obtained at the time of enrollment into study.
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Monroy, A., Goodrich, S., Brown, S.A. et al. Effects of Alcohol Use on Patient Retention in HIV Care in East Africa. AIDS Behav (2024). https://doi.org/10.1007/s10461-024-04483-z
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DOI: https://doi.org/10.1007/s10461-024-04483-z