Hypertension control in sub-Saharan Africa: Clinical inertia is another elephant in the room

Acceptability of fixed-dose combination treatments for hypertension in Kenya: A qualitative study using the Theoretical Framework of Acceptability

Fixed-dose combinations (FDCs) - 2-3 anti-hypertensive medications in a single pill - have the potential to improve hypertension treatment and outcomes. Yet, they are not widely implemented. Factors undermining implementation remain unknown, particularly in sub-Saharan Africa, where hypertension is a major cause of disease burden and is poorly controlled. This study explored the acceptability of FDCs among patients, caregivers, and healthcare workers. We conducted semi-structured in-depth interviews with 58 participants from four purposively selected health facilities in Kiambu county, Kenya. Data were analyzed using an iterative thematic analysis approach, guided by the Theoretical Framework of Acceptability. Our findings indicate that FDCs are potentially acceptable to all participant groups. Acceptability is supported by the perception of FDCs as a means of reducing treatment burden (for patients and healthcare workers) and improving treatment adherence, and by patients' deferral to and trust in healthcare workers. However, acceptability among healthcare workers may be undermined by variable levels of knowledge about FDCs, concerns about FDCs as an "inflexible" treatment that does not allow dose titration or identifying causes of side effects, and concerns about inconsistent availability and affordability of FDCs in Kenya. To enhance acceptability and implementation of FDCs for hypertension treatment in Kenya, it is crucial to strengthen the capacity of all healthcare worker cadres to appropriately prescribe, inform patients about, and support adherence to FDCs. These efforts must align with broader initiatives to address upstream health system factors such as poor availability and affordability.

deliVERy of optimal blood pressure coNtrol in afrICA (VERONICA)-Nigeria study: Rationale and design of a randomized clinical trial

BACKGROUND

Blood pressure (BP) control among treated patients in Africa is very suboptimal, with low levels of combination therapy use and therapeutic inertia being among the major barriers to effective control of hypertension. The VERONICA-Nigeria study aims to evaluate, among Black African adults with hypertension, the effectiveness and safety of a triple pill-based treatment protocol compared to Nigeria hypertension treatment protocol (standard care protocol) for the treatment of hypertension.

METHODS

This study involves a randomized, parallel-group and open-label trial. Adults with uncontrolled hypertension (n = 300), untreated or receiving monotherapy, with no contraindication to study treatments will be randomly assigned 1:1 to treatment with a triple pill based-treatment protocol or standard care protocol. Follow-up is for 6 months, with interim follow up visits at month 1, 2, and 3. In a noncomparative extension treatment period, participants completing the 6 months randomized period and on ≤3 BP-lowering drugs will receive treatment with the triple pill-based treatment protocol for 12 months. The primary outcome is change in home mean SBP from baseline to month 6, and key secondary efficacy outcome is percentage of participants with clinic BP <140/90 mmHg at month 6. The primary safety outcome is discontinuation of trial treatment due to adverse events from randomization to month 6. Economic evaluation will be conducted to assess the cost-effectiveness of the triple pill-based treatment protocol, and process evaluation will be conducted to understand the context in which the trial was conducted, implementation of the trial and interventions and mechanisms of effect, and potential barriers and facilitators to implementing the intervention in clinical practice.

CONCLUSION

The VERONICA-Nigeria trial will provide evidence of effectiveness and safety of the triple-based treatment protocol for the pharmacological management of hypertension, in Black African adults.

TRIAL REGISTRATION

PACTR202107579572114.

Low-Dose Triple-Pill vs Standard-Care Protocols for Hypertension Treatment in Nigeria: A Randomized Clinical Trial

Importance

With the high burden of hypertension in sub-Saharan Africa, there is a need for effective, safe and scalable treatment strategies.

Objective

To compare, among Black African adults, the effectiveness and safety of a novel low-dose triple-pill protocol compared with a standard-care protocol for blood pressure lowering.

Design and Setting

Randomized, parallel-group, open-label, multicenter trial conducted in public hospital-based family medicine clinics in Nigeria.

Participants

Black African adults with uncontrolled hypertension (≥140/90 mm Hg) who were untreated or receiving a single blood pressure-lowering drug.

Interventions

Participants were randomly allocated to low-dose triple-pill or standard-care protocols. The triple-pill protocol involved a novel combination of telmisartan, amlodipine, and indapamide in triple one-quarter, one-half, and standard doses (ie, 10/1.25/0.625 mg, 20/2.5/1.25 mg, and 40/5/2.5 mg), with accelerated up-titration. The standard-care protocol was the Nigeria hypertension treatment protocol starting with amlodipine (5 mg).

Main Outcomes and Measures

The primary effectiveness outcome was the reduction in home mean systolic blood pressure, and the primary safety outcome was discontinuation of trial treatment due to adverse events, both from randomization to month 6.

Results

The first participant was randomized on July 19, 2022, and the last follow-up visit was on July 18, 2024. Among 300 randomized participants (54% female; mean age, 52 years; baseline mean home blood pressure, 151/97 mm Hg; and clinic blood pressure, 156/97 mm Hg), 273 (91%) completed the trial. At month 6, mean home systolic blood pressure was on average 31 mm Hg (95% CI, 28 to 33 mm Hg) lower in the triple-pill protocol group and 26 mm Hg (95% CI, 22 to 28 mm Hg) lower in the standard-care protocol group (adjusted difference, -5.8 mm Hg [95% CI, -8.0 to -3.6]; P < .001]). At month 6, clinic blood pressure control (<140/90 mm Hg) was 82% vs 72% (risk difference, 10% [95% CI, -2% to 20%]) and home blood pressure control (<130/80 mm Hg) was 62% vs 28% (risk difference, 33% [95% CI, 22% to 44%]) in the triple-pill compared with the standard-care protocol group; these were 2 of 21 prespecified secondary effectiveness end points. No participants discontinued trial treatment due to adverse events.

Conclusions and Relevance

Among Black African adults with uncontrolled hypertension, a low-dose triple-pill protocol achieved better blood pressure lowering and control with good tolerability compared with the standard-care protocol.

Trial Registration

Pan African Clinical Trials Registry Identifier: PACTR202107579572114.

Comparing scale up of status quo hypertension care against dual combination therapy as separate pills or single pill combinations: an economic evaluation in 24 low- and middle-income countries

Background

International hypertension treatment guidelines recommend initiating pharmacological treatment with combination therapy and using fixed dose single pill combinations (SPCs) to improve adherence. However, few countries have adopted combination therapy as a form of first-line treatment and SPC uptake in low- and middle-income countries is low due in part to cost and availability. Evidence on costs and cost-effectiveness is needed as health authorities consider incorporating new recommendations into national clinical practice guidelines.

Methods

Over a 30-year time horizon, we used an Excel-based Markov cohort state-transition model to assess the financial costs (screening, treatment, program, and supply chain costs) and socio-economic outcomes (health outcomes, value of lives saved, productivity losses averted) of three antihypertensive treatment scenarios. A baseline scenario scaled treatment among adults age 30 plus while assuming continuation of the widespread practice of initiating treatment with monotherapy. Scenarios one and two scaled treatment while initiating patients on two antihypertensive medications, either as separate pills or as a SPC. Analysis inputs are informed by country-specific data, meta-analyses of the blood-pressure lowering of antihypertensive medications, and own-studies of medication costs. We compared costs, cost-effectiveness, and net-benefits across scenarios, and assessed uncertainty in a one-way sensitivity analysis.

Findings

Using dual combination therapy (with or without SPCs) as first-line treatment would increase costs relative to current practices that largely use monotherapy. Required additional annual resources averaged as much as 3.6, 0.9, and 0.2 percent of government health expenditures in the analysis' low-, lower-middle, and upper-middle income countries. However, across 24 countries, over the next 30 years, combination therapy with separate pills could save 430,000 more lives and combination therapy with SPCs could save 564,000 more lives compared to baseline treatment practices. Administration of two or more medications using SPCs generated higher net benefits in most countries (16/24) compared to the baseline scenario.

Interpretation

First line treatment employing SPCs is likely to generate higher net benefits compared to status quo treatment practices in countries with relatively higher incomes. To improve population health, national health systems would benefit from reducing structural and other barriers to the use of combination therapy and SPCs.

Funding

This journal article was supported by TEPHINET cooperative agreement number 1NU2HGH000044-01-0 funded by the US Centers for Disease Control and Prevention.

High rate of uncontrolled hypertension among adults receiving integrated HIV and hypertension care with aligned multi-month dispensing in Malawi: results from a cross-sectional survey and retrospective chart review

INTRODUCTION

People living with HIV have high rates of hypertension. Integrated HIV and hypertension care with aligned multi-month dispensing of medications (MMD) could decrease the burden of care for individuals and health systems. We sought to describe hypertension control and evaluate its association with different durations of MMD among Malawian adults receiving integrated care with aligned dispensing of antiretroviral therapy (ART) and antihypertensive medication.

METHODS

We conducted a cross-sectional survey and retrospective chart review of adults (≥18 years) receiving integrated HIV and hypertension care on medications for both conditions for at least 1 year, with aligned MMD at seven clinics in Malawi. Data were collected from July 2021 to April 2022 and included socio-demographics, clinical characteristics, antihypertensive medications and up to the three most recent blood pressure measurements. Bivariate analyses were used to characterize associations with hypertension control. Uncontrolled hypertension was defined as ≥2 measurements ≥140 and/or ≥90 mmHg. Chart reviews were conducted for a random subset of participants with uncontrolled hypertension to describe antihypertensive medication adjustments in the prior year.

RESULTS

We surveyed 459 adults receiving integrated care with aligned dispensing (58% female; median age 54 years). Individuals most commonly received a 3-month aligned dispensing of ART and antihypertensive medications (63%), followed by every 6 months (16%) and every 4 months (15%). Hypertension control was assessed in 359 respondents, of whom only 23% had controlled hypertension; 90% of individuals in this group reported high adherence to blood pressure medications (0-1 missed days/week). Control was more common among those with longer aligned medication dispensing intervals (20% among those with 1- to 3-month dispensing vs. 28% with 4-month dispensing vs. 40% with 6-month dispensing, p = 0.011). Chart reviews were conducted for 147 individuals with uncontrolled hypertension. Most had high self-reported adherence to blood pressure medications (89% missing 0-1 days/week); however, only 10% had their antihypertensive medication regimen changed in the prior year.

CONCLUSIONS

Uncontrolled hypertension was common among Malawian adults receiving integrated care with aligned MMD and was associated with shorter refill intervals and few antihypertensive medication escalations. Integrated care with aligned MMD is promising, but further work is needed to understand how to optimize hypertension outcomes.

Clinician response after receipt of abnormal pediatric ambulatory blood pressure monitoring - characteristics associated with inertia and action

BACKGROUND

Ambulatory Blood Pressure Monitoring (ABPM) is recommended for diagnosis and management of hypertension. We aimed to identify characteristics associated with physician action after receipt of abnormal findings.

METHODS

This was a retrospective cross-sectional analysis of patients 5-22 years old who underwent 24-h ABPM between 2003-2022, met criteria for masked or ambulatory hypertension, and had a pediatric nephrology clinic visit within 2 weeks of ABPM. "Action" was defined as medication change/initiation, lifestyle or adherence counseling, evaluation ordered, or interpretation with no change. Characteristics of children with/without 1 or more actions were compared using Student t-tests and Chi-square. Regression analyses explored the independent association of patient characteristics with physician action.

RESULTS

115 patients with masked (n = 53) and ambulatory (n = 62) hypertension were included: mean age 13.0 years, 48% female, 38% Black race, 21% with chronic kidney disease, and 25% overweight/obesity. 97 (84%) encounters had a documented physician action. Medication change (52%), evaluation ordered (40%), and prescribed lifestyle change (35%) were the most common actions. Adherence counseling for medication and lifestyle recommendations were documented in 3% of encounters. 24-h, wake SBP load, and sleep DBP load were significantly higher among those with physician action. Patients with > 1 action had greater adiposity, SBP, and dipping. Neither age, obesity, nor kidney disease were independently associated with physician action.

CONCLUSIONS

While most abnormal ABPMs were acted upon, 16% did not have a documented action. Greater BP load was one of the few characteristics associated with physician action. Of potential actions, adherence counseling was underutilized.

Development of a machine learning-based model for predicting individual responses to antihypertensive treatments

BACKGROUND AND AIMS

Personalized antihypertensive drug selection is essential for optimizing hypertension management. The study aimed to develop a machine learning (ML) model to predict individual blood pressure (BP) responses to different antihypertensive medications.

METHODS AND RESULTS

We used data from a pragmatic, cluster-randomized trial on hypertension management in China. Each patient's multiple visit records were included, and two consecutive visits were paired as the index and subsequent visits. The least absolute shrinkage and selection operator method was used to select index visit variables for predicting subsequent BP. The dataset was randomly divided into training and test sets in a 7:3 ratio. Model performance was evaluated using mean absolute error (MAE) and R-square in the test set. A total of 19,013 hypertension management visit records (6282 patients) were included. The mean age of the study population was 63.9 years, and 2657 (42.3%) were females. A total of 12 phenotypical features (age, sex, smoking within seven days, body mass index, waist circumference, index visit systolic BP, diastolic BP, heart rate, comorbidities of diabetes, dyslipidemia, coronary heart disease, and stroke), together with currently taking any prescribed antihypertensive medication regimens and visits time interval were selected to build the model. The Extreme Gradient Boost model performed best among all candidate algorithms, with an MAE of 8.57 mmHg and an R2 = 0.28 in the test set.

CONCLUSION

The ML techniques exhibit significant potential for predicting individual responses to antihypertensive treatments, thereby aiding clinicians in achieving optimal BP control safely and efficiently.

TRIAL REGISTRATION

ClinicalTrials.gov, NCT03636334. Registered July 3, 2018, https://clinicaltrials.gov/study/NCT03636334.

Measurement Tools and Utility of Hair Analysis for Screening Adherence to Antihypertensive Medication

Poor adherence to the prescribed antihypertensive therapy is an understated public health problem and is one of the main causes of the high prevalence of uncontrolled hypertension in sub-Saharan Africa. Medication adherence is vital for the effectiveness of antihypertensive treatment and is key to ameliorating the clinical outcomes in hypertensive patients. However, it has often been ignored because the current methods used to assess medication adherence are not reliable, limiting their utilization in clinical practice. Therefore, the identification of the most accurate and clinically feasible method for measuring medication adherence is critical for tailoring effective strategies to improve medication adherence and consequently achieve blood pressure goals. This review not only explores various available methods for estimating medication adherence but also proposes therapeutic drug monitoring in hair for the measurement of medication adherence to the antihypertensive medication period.

Contribution of single-pill combinations in the management of hypertension: perspectives from China, Europe and the USA

Uncontrolled hypertension is associated with an increased risk of adverse clinical vascular outcomes and death. Hypertension management guidelines from China and the USA recommend initiation of antihypertensive pharmacotherapy with a single drug for patients without severe hypertension at presentation. Current European hypertension guidelines take a different approach and recommend the use of combination therapy from the time of diagnosis of hypertension for most patients. This article reviews the burden of hypertension in these countries and summarises the evidence base for the use of antihypertensive combination therapy contained within a single tablet (single-pill combinations, SPC). Typically, half or less of populations from China, Europe and the USA who were found to have hypertension were aware of their condition, less than half of those receiving treatment, and fewer still achieved adequate blood pressure (BP) control. The reasons for the unaddressed burden of hypertension are complex and multifactorial, with contributions from factors related to patients, healthcare providers and healthcare systems. The use of SPCs of antihypertensive therapies helps to optimise adherence with therapy and is likely to result in superior BP control. There is a strong evidence base to support current European guideline recommendations on the initiation of antihypertensive therapy with SPCs for the majority of people with hypertension.

Addressing Failures in Achieving Hypertension Control in Low- and Middle-Income Settings through Simplified Treatment Algorithms

Hypertension is the most important risk factor for cardiovascular diseases (CVDs), which are the leading global cause of death. Hypertension is under-diagnosed and under-treated in most low- and middle-income countries (LMICs). Current algorithms for hypertension treatment are complex for the healthcare worker, limit decentralization, complicate procurement and often translate to a large pill burden for the person with hypertension. We summarize evidence supporting implementation of simple, algorithmic, accessible, non-toxic and effective (SAANE) algorithms to provide a feasible way to access and maintain quality care for hypertension. Implementation of these algorithms will enable task shifting to less specialised health care workers and lay cadres, provision of fixed dose combinations, consolidation of the market while retaining generic competition, simplification of laboratory requirements, and lowering costs for health systems and people who incur out of pocket expenses.

Hypertension in Low- and Middle-Income Countries

In recent decades low- and middle-income countries (LMICs) have been witnessing a significant shift toward raised blood pressure; yet in LMICs, only 1 in 3 are aware of their hypertension status, and ≈8% have their blood pressure controlled. This rising burden widens the inequality gap, contributes to massive economic hardships of patients and carers, and increases costs to the health system, facing challenges such as low physician-to-patient ratios and lack of access to medicines. Established risk factors include unhealthy diet (high salt and low fruit and vegetable intake), physical inactivity, tobacco and alcohol use, and obesity. Emerging risk factors include pollution (air, water, noise, and light), urbanization, and a loss of green space. Risk factors that require further in-depth research are low birth weight and social and commercial determinants of health. Global actions include the HEARTS technical package and the push for universal health care. Promising research efforts highlight that successful interventions are feasible in LMICs. These include creation of health-promoting environments by introducing salt-reduction policies and sugar and alcohol tax; implementing cost-effective screening and simplified treatment protocols to mitigate treatment inertia; pooled procurement of low-cost single-pill combination therapy to improve adherence; increasing access to telehealth and mHealth (mobile health); and training health care staff, including community health workers, to strengthen team-based care. As the blood pressure trajectory continues creeping upward in LMICs, contextual research on effective, safe, and cost-effective interventions is urgent. New emergent risk factors require novel solutions. Lowering blood pressure in LMICs requires urgent global political and scientific priority and action.