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Study Protocol

Mapping Psychosocial Determinants of Loss to Follow-Up Among Drug-resistant Tuberculosis Patients in South Africa: A Scoping Review Protocol

[version 1; peer review: awaiting peer review]
PUBLISHED 24 Dec 2025
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OPEN PEER REVIEW
REVIEWER STATUS AWAITING PEER REVIEW

Abstract

Background

Drug-resistant tuberculosis (DR-TB) in South Africa continues to threaten TB control, with loss to follow-up (LTFU) at both pretreatment (diagnosed but not initiated) and on-treatment stages undermining program success. Psychosocial determinants such as stigma, depression and anxiety, alcohol and substance use, and social and family support are frequently implicated, yet evidence is scattered across disciplines, uses heterogeneous definitions and tools, and is seldom synthesized for policy and implementation.

Materials and Method

This scoping review aims to systematically map psychosocial determinants associated with pretreatment and on-treatment LTFU among people with DR-TB in South Africa, describe how these determinants and LTFU are defined and measured, identify contextual modifiers (e.g., HIV status, sex/age, province, urban–rural setting, decentralization, regimen era), and highlight evidence gaps and practical leverage points for intervention. The review will follow established scoping-review methodology and report per PRISMA-ScR following five steps: (1) defining the research question, (2) search strategy, (3) setting inclusion criteria, (4) extracting data, (5) assessing, summarizing, presenting findings and (6) Consultation. A comprehensive peer-reviewed literature search, including PubMed, Scopus, ScienceDirect, and Google Scholar, will be conducted by two independent reviewers. The review will span over eight weeks, focusing on studies in South Africa published in English language between 2010 and 2025. Article eligibility will be determined using a two-stage screening process with disagreements resolved through consensus and consultation of a third reviewer. The results of this review will be presented as tables, including a narrative synthesis of the findings. No meta-analysis is planned.

Conclusion

The review will deliver a policy-ready map of psychosocial risks and promising support for DR-TB retention in South Africa, informing the design and targeting of patient-support packages and outlining priorities for future evaluation and standardization of LTFU definitions and psychosocial measures.

Keywords

Drug-resistant tuberculosis, loss to follow-up, psychosocial determinants, stigma, mental health, depression, South Africa

Introduction

Despite significant progress towards its eradication, tuberculosis (TB) continues to be the principal cause of death from a single infectious agent globally with 1.25 million fatalities in 2023.1 In many developing nations, TB, a chronic, airborne infection, caused by Mycobacterium tuberculosis although treatable and preventable, continues to be a major cause of mortality.24 This has become a worrisome trend in resource-constrained nations even with the availability of effective treatment for decades.2,5 The Global TB report of the World Health Organization (WHO) estimated that 10.8 million people were affected by TB in 2023, with an incidence rate of 134 per 100,000 population and Africa alone reported the highest TB infections, accounting for 24%.1,2

Approximately 5% of incident TB cases develop drug-resistant TB (DR-TB).6 DR-TB develops either as a result of misuse of anti-TB medications or outright infection with a drug-resistant strain.4 DR-TB is a significant public health challenge globally recognized by the WHO as a threat to achieving the End TB targets.7 The DR-TB pandemic is characterized by high rates of morbidity, mortality, and poor treatment outcomes and is mainly concentrated in low and middle-income countries including Africa, where there are resource constraints and low TB treatment coverage.8 DR-TB infected patients face significant economic and social costs and only 33% access quality care. The remaining proportion represents the missing patients otherwise known as loss to follow up (LTFU) and reaching them is a significant public health challenge.9 LTFU contributes to poor outcomes, leading to continued disease transmission, development of further drug resistance, and increased mortality.

Psychosocial determinants including stigma, depression, poverty, social isolation, and lack of family support are increasingly recognized as critical factors influencing LTFU. While several studies have explored these factors in various contexts, the evidence remains fragmented and scattered, necessitating a comprehensive mapping through a scoping review.

Rationale for scoping review

Drug-resistant tuberculosis (DR-TB) remains a significant public health concern in South Africa, with LTFU both pretreatment and on-treatment posing persistent challenges to treatment success. While recent policy and therapeutic advancements, such as the introduction of short all-oral regimens, aim to ease treatment burden, psychosocial barriers to care remain inadequately addressed. Evidence on factors like stigma, depression, substance use, and socioeconomic stressors is fragmented and inconsistently measured, limiting its utility for programmatic action. Given South Africa’s National TB Program’s call for patient-centered, evidence-based strategies, a scoping review is necessary to systematically map the psychosocial determinants of LTFU, clarify definitions and measurement tools, highlight contextual modifiers, and identify implementation gaps. This will support the development of targeted interventions and inform policy design to enhance retention in DR-TB care.

Methodology

Study design

The proposed scoping review will utilize the Joanna Briggs Institute (JBI) methodology for scoping reviews and the Preferred Reporting Items for Systematic Reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR) guidelines and checklist to enable us make use of literature across study designs and in both peer-reviewed and grey literature.1012 The study will be accomplished in six key phases ( Figure 1).

  • 1. Defining the research question

  • 2. Developing a search strategy

  • 3. Delineating inclusion and exclusion criteria

  • 4. Charting the data

  • 5. Data extraction, analysis and presentation of the results

  • 6. Consultation

1a85c9d3-6643-40d3-9d13-3a0ff9a9403c_figure1.gif

Figure 1. Six stages of conducting a scoping review.

Stage 1: Defining the research question

A well-crafted research question allows the exploration of appropriate literature, identifies gaps in knowledge, and the synthesis of evidence thus ensuring the systematic conduct of a scoping review. Hence, the following research questions will be answered in this scoping review:

  • What psychosocial determinants are associated with pretreatment and on-treatment LTFU among people with DR-TB in African settings?

  • How are these determinants defined, measured, and reported across study designs and programmatic eras (e.g., pre- vs. post-“short, all-oral” regimens)?

  • Where are the evidence gaps and what implementation strategies are suggested to address them?

To match the study selection with the research issue, this study will employ the Population, Intervention, Comparison, Outcomes, and Timeline (PICOT) framework. As there is no comparator in the proposed scoping review, therefore a PIOT framework will apply. Table 1 displays the PIOT framework to be used in this investigation. The research will run for 8 weeks, from 1 November to 31 December 2025, and studies from 2010 to 2025 will be eligible. In December 2010, WHO convened a global consultation and issued its first policy recommending Xpert MTB/RIF for rapid detection of TB and rifampicin resistance, triggering country adoption and large-scale roll-out. South Africa planned national roll-out from 2011. This shift shortened diagnostic delays and altered patient pathways which are key drivers of pretreatment and on-treatment LTFU. This period captures the programmatic era of DR-TB care in South Africa when diagnostic, treatment, and service-delivery changes reshaped the psychosocial context of LTFU. The period also accounts for COVID-19 disruptions and recovery. The pandemic caused major interruptions to TB diagnosis and treatment in South Africa with partial recovery, thereafter, likely amplifying psychosocial and structural risks for LTFU; extending the window through 2025 allows inclusion of the post-pandemic recovery period and the National TB Recovery Plan trajectory.

Table 1. PICOT framework for study selection.

Criteria
P-PopulationAdult patients aged 18-60 years undergoing treatment of TB, following diagnosis of TB
I-Intervention Psychosocial Determinants of Loss to Follow-Up Among Drug-resistant Tuberculosis Patients
C-ComparisonNo comparison group
O-OutcomePrimary

  • - Identification of psychosocial determinants (e.g., stigma, depression, substance use, social support) associated with LTFU among DR-TB patients.

  • - Characterization of how LTFU and psychosocial determinants are defined and measured across studies.

  • - Secondary outcomes.

  • - Identification of contextual modifiers (e.g., HIV status, gender/age, geographic setting).

  • - Identification of gaps in evidence and recommendations for future research or interventions.

T- Timeline2010 – 2025

Stage 2: Developing a search strategy

The strategy will utilize a research-librarian-led electronic search strategy following reviewers’ careful consideration. A comprehensive search strategy will be developed using PubMed, Scopus, ScienceDirect, and Google Scholar electronic databases, an all-inclusive search strategy will be developed for peer-reviewed articles and gray literature search focusing on English-language studies published between 2010 and 2025. To allow for the inclusion of appropriate studies, the review team will ensure that curated combination of Boolean operators, keywords and search terms are employed in electronic databases search ( Table 2).

Table 2. Initial electronic database search results on 20th September 2025.

Electronic databaseSearch strings Results
PubMed“tuberculosis” [tw] OR “drug-resistant” [Mesh] OR “loss to follow-up” [tw] OR “default*” OR “treatment interruption” [tw] AND “psychosocial determinants” [tw] OR “stigma” [tw] OR “substance use” [tw] OR “social support” [tw] OR “poverty” [tw] OR “food insecurity” [tw] OR “transportation” [tw] AND “South Africa*” [tw] AND (2010/1/1:2025/9/20[pdat]))2,744
ScienceDirect“tuberculosis” AND “drug-resistant” OR “psychosocial determinants” AND “South Africa3
Scopus“tuberculosis” AND “drug-resistant” AND “psychosocial determinants” OR “stigma” AND “loss to follow up” AND “South Africa”11
Google Scholar“Multi-drug tuberculosis” OR “loss to follow-up” OR default OR “treatment interruption” OR “substance use” OR “social support” AND “South Africa”17,800

Stage 3: Study selection of eligible studies

To ensure a systematic and transparent selection process, the PIOT framework will guide the title and abstract screening, with two reviewers (MCH and OOA) working independently. The selection of eligible studies as indicated in Table 3 is expected to be finalized within 8 weeks, in accordance with the PRISMA-ScR checklist. After retrieving all relevant records from the databases, duplicates will be removed using EndNote V.20 (Clarivate). The entire screening process will be conducted using the Covidence systematic review platform to support collaboration between reviewers and ensure consistency. Discrepancies at any stage will be resolved through discussion and, if necessary, consultation with a third reviewer (OMO) to reach consensus. The PRISMA-ScR flowchart will be used to document the study selection, detailing the number of records identified, screened and included. A blank PRISMA-ScR flowchart is shown in Figure 2.

Table 3. Inclusion and exclusion criteria.

Inclusion criteriaExclusion criteria
Studies reporting on DR-TB patients in English language.Studies reporting on other types of TB (e.g., drug-susceptible TB) or extrapulmonary TB.
Studies exploring psychosocial determinants of LTFU, such as social support, stigma, mental health, housing, socioeconomic factors, and patient-provider relationships.Studies that do not address psychosocial factors or LTFU among DR-TB patients.
Studies that report at least one psychosocial determinant linked to LTFU/retention (e.g., stigma, depression/anxiety/stress, substance/alcohol, use, beliefs/knowledge, self-efficacy, social/family/peer support, disclosure, gender norms; plus, closely linked social/structural stressors such as poverty, food insecurity, travel distance/costs, migration, homelessness, incarceration).Purely biomedical or pharmacologic predictors (e.g., mutations, drug levels) with no psychosocial link; studies of adherence proxies without an engagement/retention or LTFU outcome.
Studies that report any measure of LTFU or disengagement/attrition/“default,” pretreatment (diagnosed but not initiated) or on-treatment (interruption after initiation); with retention measures clearly defined.Studies that do not report LTFU/retention/disengagement (e.g., only culture conversion, cure, or mortality without engagement outcomes).
Studies carried out in any province in South Africa, including prisons, mines, refugee/internally displaced persons (IDP) settings, community-based models, primary/tertiary care. Multi-region studies if a South African subset is extractable.Studies conducted outside South Africa; global analyses without separable South African data.
Quantitative (cohort, case-control, cross-sectional, quasi-experimental, RCTs if they report relevant outcomes); Qualitative (interviews/focus group discussions (FGDs)/ethnography); mixed-methods; Implementation/program reports; Theses/dissertations with sufficient methods/results.Editorials, opinion pieces, narrative commentaries without empirical data; single-patient case reports not addressing psychosocial determinants; conference abstracts without sufficient data and no linked full report.
1a85c9d3-6643-40d3-9d13-3a0ff9a9403c_figure2.gif

Figure 2. PRISMA for Scoping Reviews (PRISMA-ScR) flowchart for study selection for the study titled Mapping Psychosocial Determinants of Loss to Follow-Up Among Drug-resistant Tuberculosis Patients in South Africa: A Scoping Review Protocol.

Source: Tricco AC, Lillie E, Zarin W, O’Brien KK, Colquhoun H, Levac D, et al. PRISMA extension for scoping reviews (PRISMA-ScR): checklist and explanation. Ann Intern Med, 2018,169 (7), 467–473.

Eligibility criteria

Stage 4: Data charting process

A standardized data charting form will be developed and pilot-tested to ensure clarity, consistency, and suitability for capturing relevant information across studies. The form will be designed to capture essential information as outlined in Table 4.

Table 4. Data charting form.

1Author(s)
2Year of publication
3Title of study
4Aim of study
5Study design
6Study setting/country
7Study population
8Age group
9Intervention characteristics – (stigma, depression, anxiety, social/family support, poverty, food insecurity, substance use, self-efficacy, health beliefs, gender norms)
10Study outcomes (Reported outcomes: LTFU rates, retention rates, treatment interruption data)
11Key findings
12Recommendations from the study

Stage 5: Data assessment, summarizing, and presenting the results

A descriptive assessment to assess completeness of reporting; variability in LTFU definitions; presence/quality of measurement tools for psychosocial constructs will be performed. Both quantitative and qualitative methods will be utilized in the evaluation of scoping review results. Qualitative analysis will involve using themes to evaluate the data extraction table and develop overarching themes from the literature using tables and graphs that can assist in addressing the research questions and developing future research questions and frameworks emerging from psychosocial determinants of LTFU among DR-TB patients. The extracted data will be systematically organized into a table for easy comparison and analysis, categorizing information by study characteristics, psychosocial determinants of LTFU, health outcomes, adaptation strategies, and study quality. Secondly, quantitatively, a numerical summary using descriptive statistics will be conducted to explore opportunities for future studies across disciplines that may be under-represented in the publications reviewed.

Quality assessment of included studies

Quality assessment is not a core component of this scoping review, however, the study designs of included articles, qualitative, quantitative, and mixed methods will be documented to enhance transparency and consistency in reporting. This descriptive approach will aid in contextualizing the strength of the evidence base and in highlighting methodological gaps. No formal risk of bias assessment will be conducted as obtained in standard scoping review methodology.

Stage 6: Consultation

Stakeholders will not be involved in the design of this scoping review however, consultation with relevant actors including researchers, policymakers, and practitioners will be undertaken to validate the findings and support their interpretation for evidence-informed decision-making and practical application.

Discussion

By applying a PICOT-aligned approach, comprehensive multi-database and grey literature searches, dual-reviewer screening, and a piloted data-charting framework, the scoping review will map existing evidence and clarify how individual, interpersonal, community, and system/structural factors including stigma, mental health, substance use, social support, poverty, food insecurity, and distance/transport costs shape both pretreatment and on-treatment disengagement from care. The synthesis, reported in line with PRISMA-ScR, will prioritize transparency in definitions (especially heterogeneous LTFU thresholds), measurement tools for psychosocial constructs, and contextual modifiers such as HIV co-infection, regimen era (long vs. short all-oral), decentralization, and urban–rural setting.

This review will inform National TB Program policies and frontline implementation, guide the design and target of patient-support packages and identify priorities for future research. The scope intentionally emphasizes breadth over causal inference and will not conduct meta-analysis; the review will document methodological limitations and reporting gaps to enable subsequent focused systematic reviews or primary studies. Through an optional stakeholder consultation with program managers, clinicians, community health workers, and patient representatives, the findings will be grounded in operational realities and ready for uptake. A limitation of this review is that the studies are limited to South Africa, given the high TB prevalence and incidence rates and it remains one of the global high-burden countries for TB. Overall, this protocol positions the review to deliver actionable, context-specific intelligence that can reduce LTFU, improve DR-TB treatment success, and accelerate progress toward South Africa’s End TB targets.

Ethics and dissemination

Ethical approval is not required for this scoping review. The findings of this review will be disseminated through peer-reviewed publications and academic presentations at local, national and international conferences. Policymakers and stakeholders will also benefit from reports generated from this study. Stakeholder consultation including National Tuberculosis Program managers, DR-TB clinicians/nurses, community health workers (CHWs), and patient representatives across provinces in South Africa will be carried out to validate findings and refine recommendations.

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Hosu MC, Akapo OO and Ogbodu OM. Mapping Psychosocial Determinants of Loss to Follow-Up Among Drug-resistant Tuberculosis Patients in South Africa: A Scoping Review Protocol [version 1; peer review: awaiting peer review]. F1000Research 2025, 14:1440 (https://doi.org/10.12688/f1000research.171890.1)
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VERSION 1 PUBLISHED 24 Dec 2025
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Alongside their report, reviewers assign a status to the article:
Approved - the paper is scientifically sound in its current form and only minor, if any, improvements are suggested
Approved with reservations - A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.
Not approved - fundamental flaws in the paper seriously undermine the findings and conclusions
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