Project Khanya: Peer-Delivered Intervention to Improve HIV Medication Adherence and Substance Use in South Africa

Project Khanya: Peer-Delivered Intervention to Improve HIV Medication Adherence and Substance Use in South Africa

University of Cape Town, National Institute on Drug Abuse (NIDA), Weill Medical College of Cornell University, University of Miami

The purpose of this study is to evaluate a stepped care behavioral intervention for HIV medication adherence and substance use ("Khanya") integrated into an HIV primary care setting in South Africa. The intervention is specifically designed to be implemented by non-specialist counselors with lived substance use experience (i.e., peers), using a task sharing, stepped care model in local primary care clinics. The Khanya stepped care package will be compared to usual care, enhanced with referral to a local outpatient substance use treatment program (Enhanced Standard of Care - ESOC) over 12 months.

South Africa is home the highest number of people living with HIV in the world and has a high burden of substance use disorder (SUD). Globally, a SUD treatment gap exists, particularly in low and middle-income countries (LMICs), such as South Africa, where only 1-4% of individuals receive minimally adequate treatment. Workforce shortages are also severe in LMICS, and countries such as South Africa have responded to this through the implementation of task sharing models to expand access to antiretroviral therapy (ART) and mental health services. However, efforts to implement task shared, SUD treatment and ART adherence interventions that can be feasibly and sustainably integrated into primary care are limited. Therefore, the purpose of this study is to help fill this gap in care by evaluating Khanya, a peer-delivered, behavioral intervention to improve HIV care outcomes and reduce substance use. The present study is a hybrid effectiveness-implementation trial designed to evaluate Khanya compared to usual care, enhanced with referral to a local outpatient substance use treatment program (Enhanced Standard of Care - ESOC) over 12 months. To provide care for those most in need, participants will be patients with HIV who are struggling with ART adherence and have elevated SUD risk. In this study, Khanya will be delivered as a stepped-care package in which the least resource-intensive part of the intervention (i.e., a single session problem solving intervention for HIV medication adherence) will be delivered first. Only individuals randomized to the Khanya intervention who are still struggling with HIV medication adherence after the first session will be stepped up to receive the more comprehensive, resource-intensive part of the intervention (i.e., six additional sessions of the intervention). Primary effectiveness outcomes in this clinical trial include ART adherence and SUD.

Immunologic Deficiency Syndrome, Substance Use, Acquired Immunodeficiency Syndrome, Immune system diseases, behavioral symptoms, RNA Virus Infections, HIV Infections, Alcohol Use, Drug Use, Treatment Adherence and Compliance, Delivery and Health Care, Task Sharing, Mental Health, Global Health, South Africa, Cost Effectiveness, Implementation Science

Khanya is a peer-delivered, behavioral intervention to improve HIV medication adherence and reduce problematic SUD symptoms. Khanya is delivered as a stepped-care package in which the least resource-intensive part of the intervention (i.e., Life-Steps, a single session problem solving intervention for HIV medication adherence) will be delivered first. Only individuals randomized to the Khanya intervention who are still struggling with HIV medication adherence after the first session will be stepped up to receive the more comprehensive, resource-intensive part of the intervention (i.e., six additional sessions of the intervention). Khanya Step 2 includes evidence-based treatment components to improve ART adherence and SU, including motivational interviewing, behavioral activation, and mindfulness-based relapse prevention strategies, which have previously been piloted in this community.

Enhanced Standard of Care (ESOC) includes the local standard of care, which is referral to a free local outpatient substance use treatment program, enhanced with facilitated referrals. To enhance the standard of care, study staff will provide participants with a detailed description of the program's referral process and offer to help the participant set up an intake at the program. Additionally, the team will follow up on the referral. Participants in this arm will also receive Wisepill, a wireless adherence monitoring advice, at the baseline assessment.

"Khanya" is a peer-delivered, behavioral intervention to improve HIV medication adherence and reduce problematic SUD symptoms. Participants will either receive Khanya Step 1 or if they continue to struggle with ART adherence, they will be stepped up to the more intensive intervention, Khanya Step 2.

Percentage of prescribed antiretroviral therapy (medications) taken as measured by real time wireless monitoring device

Percentage of prescribed antiretroviral therapy (medications) taken as prescribed measured using real-time wireless monitoring (Wisepill)

Self-reported substance use will be assessed primarily by the World Health Organization Alcohol, Smoking, and Substance Involvement Screening Test (WHO-ASSIST). It is a measure used to assess substance use risk for alcohol, cannabis, cocaine, opiates, and amphetamines, hallucinogens, and other drugs. Standardized cutoff scores are used to categorize risk levels: low risk (0-3 for illicit drugs/0-10 for alcohol), moderate risk (4-26 for illicit drugs/11-26 for alcohol), or high risk (> 26) for substance use-related problems.

Biomarker-confirmed ART adherence will be measured with Dried Blood Spot (DBS) analysis of tenofovir diphosphate (TDF-DiP).

Number of days participants in each condition were on-time to, late to, or missed an HIV clinic appointment (extracted from clinic records).

15-item acceptability subscale of a pragmatic, quantitative assessment based on RE-AIM developed by the Applied Mental Health Research group (AMHR) at Johns Hopkins University. Total scores are averaged across all items and range from 0 to 3. Higher scores indicate greater acceptability.

16-item feasibility subscale of a pragmatic, quantitative assessment based on RE-AIM developed by the Applied Mental Health Research group (AMHR) at Johns Hopkins University. Total scores are averaged across all items and range from 0 to 3. Higher scores indicate greater acceptability.

Independent fidelity ratings of a randomly selected subset (20%) of intervention sessions using a fidelity assessment developed for each session that includes 15-19 items that map onto each core intervention component, and factors unique to the peer delivery implementation strategy (i.e., appropriate self-disclosure, stigmatizing behaviors, common factors including warmth and non-judgment).

Uptake will be measured as an implementation outcome, including the % of patients who initiate treatment and treatment attendance.

Health-related quality of life (HRQoL) will be measured with the EQ-5D which is the most widely used of the major HRQoL instruments capable of generating a single health utility index value to calculate quality-adjusted life-years (QALYs), and one of the most sensitive to changes in pain, physical and mental health functioning. This instrument measures HRQoL across five dimensions: mobility, self-care, usual activities, pain/discomfort, and anxiety/depression.

Biomarker-verified alcohol use will be measured with phosphatidylethanol (PEth) concentration from dried blood samples, which is an objective biomarker of alcohol use that can detect blood collected up to 21 days after alcohol consumption. Minimum detection value is 8 ng/mL. Higher PEth values indicate greater concentration of alcohol. Values of ≥ 50 ng/mL indicate unhealthy drinking.

Inclusion Criteria: HIV positive and on ART ≥18 years of age At least moderate substance use risk in the past 3 months for at least one non-tobacco substance (measured by the WHO- ASSIST: score ≥11 for alcohol, ≥4 for non-tobacco drugs) ART nonadherence and/or risk of virologic failure, defined as at least one of the following in the past 12 months 1) re-engaging in care after ≥1 month of being out of care (confirmed by pharmacy refill data) 2) ≥1 episodes of VL >400 copies/mL 3) on second- or third-line ARTs. Exclusion Criteria: Severe risk/likely dependence for opiates (WHO ASSIST score >26) because opiate substitution therapy is largely not available Severe alcohol dependence symptoms that may warrant medical management of potential withdrawal symptoms/stabilization prior to study participation Inability to provide informed consent or complete study procedures in isiXhosa or English In third trimester of pregnancy during baseline Currently enrolled in another study or treatment program focused on substance use (including Matrix) or ART adherence. Untreated or undertreated major mental illness that would interfere with study procedures

After all primary analyses are complete, de-identified data will be uploaded to an NIH-supported data repository and available by request with appropriate permissions from PI.