Control of Blood Pressure and Risk Attenuation: Post Trial Follow-Up of Randomized Groups

Long-term mortality outcome of a primary care-based mobile health intervention for stroke management: Six-year follow-up of a cluster-randomized controlled trial

BACKGROUND

Despite growing evidence of primary care-based interventions for chronic disease management in resource-limited settings, long-term post-trial effects remain inconclusive. We investigated the association of a 12-month system-integrated technology-enabled model of care (SINEMA) intervention with mortality outcomes among patients experiencing stroke at 6-year post-trial.

METHODS AND FINDINGS

This study (clinicltiral.gov registration number: NCT05792618) is a long-term passive observational follow-up of participants and their spouse of the SINEMA trial (clinicaltrial.gov registration number: NCT03185858). The original SINEMA trial was a cluster-randomized controlled trial conducted in 50 villages (clusters) in rural China among patients experiencing stroke during July 2017-July 2018. Village doctors in the intervention arm received training, incentives, and a customized mobile health application supporting monthly follow-ups to participants who also received daily free automated voice-messages. Vital status and causes of death were ascertained using local death registry, standardized village doctor records, and verbal autopsy. The post-trial observational follow-up spanned from 13- to 70-months post-baseline (up to April 30, 2023), during which no intervention was requested or supported. The primary outcome of this study was all-cause mortality, with cardiovascular and stroke cause-specific mortality also reported. Cox proportional hazards models with cluster-robust standard errors were used to compute hazard ratios (HRs) and 95% confidence intervals (95% CIs), adjusting for town, age, and sex in the main analysis model. Analyses were conducted on an intention-to-treat basis. Of 1,299 patients experiencing stroke (mean age 65.7 years, 42.6% females) followed-up to 6 years, 276 (21.2%) died (median time-to-death 43.0 months [quantile 1-quantile 3: 26.7-56.8]). Cumulative incidence of all-cause mortality was 19.0% (121 among 637) in the intervention arm versus 23.4% (155 among 662) in the control arm (HR 0.73; 95% CI 0.59, 0.90; p = 0.004); 14.4% versus 17.7% (HR 0.73; 95% CI 0.58, 0.94; p = 0.013) for cardiovascular cause-specific mortality; and 6.0% versus 7.9% (HR 0.71; 95% CI 0.44, 1.15; p = 0.16) for stroke cause-specific mortality. Although multisource verification was used to verify the outcomes, limitations exist as the survey- and record-matching-based nature of the study, unavailability of accurate clinical diagnostic records for some cases and the potential confounders that may influence the observed association on mortality.

CONCLUSIONS

Despite no observed statistically difference on stroke cause-specific mortality, the 12-month SINEMA intervention, compared with usual care, significantly associated with reduced all-cause and cardiovascular cause-specific mortality during 6 years of follow-up, suggesting potential sustained long-term benefits to patients experiencing stroke.

Community Health Worker Optimization of Antihypertensive Care in HIV (COACH): Study protocol for a pilot trial of an intervention to improve hypertension care among Tanzanians with HIV

OBJECTIVE

This study will evaluate the feasibility and preliminary effectiveness of the COACH (Community Health Worker Optimization of Antihypertensive Care in HIV) intervention, which integrates hypertension management into existing HIV care for people living with HIV (PLWH) in Tanzania.

METHODS

The study will be conducted at two HIV Care and Treatment Centers (CTCs) in Tanzania. In a single-arm pre-post feasibility trial, 100 PLWH with hypertension will be enrolled and will receive the six-month intervention. The COACH intervention includes six monthly hypertension educational sessions delivered by community health workers (CHWs) and integrated within HIV CTC visits, monthly blood pressure monitoring, follow up care coordination, fully subsidized antihypertensive medications, a standardized antihypertensive treatment algorithm, and training for providers. The intervention's implementation outcomes will be evaluated using the Reach Effectiveness Adoption Implementation Maintenance (RE-AIM) framework, and the primary study outcome (reach of the intervention) will be the proportion of all scheduled intervention sessions attended by participants, a measure of feasibility. Secondary clinical effectiveness outcomes will include adherence to antihypertensive medication, blood pressure control, body mass index, cardiovascular risk, and hypertension knowledge.

SIGNIFICANCE

The COACH intervention has the potential to significantly improve hypertension management among PLWH in Tanzania by leveraging the existing HIV care infrastructure and CHWs. This study will provide crucial insights into the feasibility and potential effectiveness of the intervention in integrating hypertension care into HIV services, informing larger-scale implementation and policy changes in Tanzania and other resource-limitted settings.

TRIAL REGISTRATION

Clinical trials.gov Identifer: NCT06503991.

Primary Care-Based Digital Health-Enabled Stroke Management Intervention: Long-Term Follow-Up of a Cluster Randomized Clinical Trial

Importance

Despite evidence of the short-term benefits of multicomponent primary care-based interventions, their long-term effects are unproven.

Objective

To evaluate the long-term outcomes of a system-integrated technology-enabled model of care (SINEMA intervention) for stroke management for systolic blood pressure (BP) and other outcomes among patients with stroke in China.

Design, Setting, and Participants

This long-term follow-up included community-dwelling clinically stable surviving participants with stroke in an open-label cluster randomized clinical trial. Of 218 villages from Nanhe County in Hebei, China, an area with suboptimal health care resources and stroke prevalence doubling the national average, 50 villages (clusters) were recruited between June 23 and July 29, 2017, and randomized in a 1:1 ratio to an intervention or a control arm (usual care). The intervention lasted 1 year (to July 31, 2018), with a posttrial observational follow-up conducted from October 1, 2022, to August 27, 2023.

Interventions

Village doctors were provided with training, performance-based incentives, technical support, and customized mobile health tools to deliver monthly follow-up to patients. Patients also received daily voice messages emphasizing medication adherence and physical activity. No intervention was requested or supported during the posttrial period.

Main Outcomes and Measures

Between-arm differences in intention-to-treat analyses of individual-level changes from baseline to long-term posttrial in systolic BP (primary outcome) and stroke recurrence, diastolic BP, BP control, antihypertensive medication use and regimen adherence, and disability (secondary outcomes).

Results

Among a total of 1042 stroke survivors, 44 (4.2%) were lost to follow-up and 998 (mean [SD] age at baseline: 65.0 [8.2] years; 544 [54.4%] men) completed posttrial assessment at a mean (SD) period of 66.6 (3.7) months (5.5 years) after baseline. The multicomponent intervention was associated with an estimated between-arm net reduction in systolic BP of -2.8 (95% CI, -5.3 to -0.3) mm Hg (P = .03). Most secondary outcomes showed a tendency toward lasting effects, with a notable absolute net reduction of 6.0 (95% CI, -11.3 to -0.7) percentage points and risk ratio of 0.77 (95% CI, 0.61-0.99) for stroke recurrence. In subgroup analyses, significant between-arm differences were observed among women and people with lower educational attainment, lower income, and higher use of and adherence to medications.

Conclusions and Relevance

In this long-term follow-up of a cluster randomized clinical trial, the 1-year intervention was associated with significantly reduced systolic BP and stroke recurrence at 5.5 years, providing evidence of long-term health and inequity-reducing benefits and holding promise for scaling up of the intervention in resource-limited settings.

Trial Registration

ClinicalTrials.gov Identifier: NCT05792618.

Task-sharing with community health workers to treat hypertension: a scoping review

Many studies have implemented and evaluated task-sharing interventions with community health workers (CHWs) to manage hypertension. To identify gaps in research, we conducted a scoping review. We searched original articles published in PubMed and EMBASE between 2010 and 2022 and found 122 articles meeting our inclusion criteria. Only seven articles were from low-income countries (LICs), most of which were qualitative studies or mixed methods studies. In the identified 122 articles, CHWs often performed health education (61.3%) and measured blood pressure (60.4%). Whereas CHWs carried out pharmacological treatment in only three studies. Participant homes (75.0%) were the most common setting for receiving interventions. Our study identified specific needs for future research, specifically, studies in LICs that are experimental in design and that collect relevant qualitative information, and studies in which CHWs do advanced task. In addition, publications of CHW studies should provide a more comprehensive list of intervention features.

Optimizing Antihypertensive Management for Hypertensive Patients With Secondary Complications: A Systematic Review and Meta-Analysis in Primary Care Settings

Despite significant pharmacological advancements, hypertension management remains challenging, with varying quality of primary care. Digital tools and other non-pharmacological interventions hold promise in addressing this challenge. Consequently, a thorough examination of these interventions is recommended. This meta-analysis focuses on clinician-oriented strategies aimed at improving hypertension management, to assess the most effective approaches for improving antihypertensive prescribing and blood pressure control for secondary prevention. This was done through a systematic review of randomized controlled trials published in PubMed and Embase since the beginning of 2010 that aimed to enhance antihypertensive medication prescription in primary care settings for hypertensive patients with secondary complications while reporting changes in blood pressure or target achievement. We screened 6305 records. Four studies met the inclusion criteria, with reported interventions including physician education and the implementation of electronic decision support systems. All studies showed that the control group had a statistically significant lower systolic blood pressure, but the effect on diastolic blood pressure was not statistically significant. The overall mean difference was 2.12 mmHg (95% CI = 0.98; 3.26, P-value = 0.0003) for systolic blood pressure in favor of the control group and 1.22 mmHg (95% CI = -0.48; 3.26, P-value = 0.16) for diastolic blood pressure, which was not statistically significant. Despite considerable efforts to control hypertension, it remains a significant obstacle to optimal cardiovascular risk reduction. This review is also limited by a scarcity of studies.

Community intervention for cardiovascular disease risk factors in Kalutara, Sri Lanka

BACKGROUND

The effectiveness of a 2015-17 community intervention to reduce cardiovascular disease (CVD) and type 2 diabetes (T2DM) risk factors is assessed in a Sri Lanka adult population, using a before-and-after study design.

METHODS

Four contiguous Public Health Midwife (PHM) areas in Kalutara district (Western Province) were exposed to a Sri Lankan designed community health promotion initiatives (without screening) to lower CVD and T2DM risk factors. Pre- and post-intervention surveys (2014, n=1,019; 2017, n=908) were of 25-64 year males (M) and females (F) from dissimilar randomly selected clusters (villages or settlements) from PHMs, with probability of selection proportional to population size, followed by household sampling, then individual selection to yield equal-probability samples. Differences in resting blood pressure (BP), fasting plasma glucose (FPG), total cholesterol, body mass index and tobacco smoking, adjusting for cluster sampling, age and socio-economic differences, were examined.

RESULTS

Hypertension prevalence declined from 25% to 16% (F) (p<.0001), and 21% to 17% (M). Both mean systolic and diastolic BP declined. T2DM declined from 18% to 13% (F), and 18% to 15% (M), as did mean fasting plasma glucose. Elevated total cholesterol declined from 21% to 15% in women (p=0.003) and mean cholesterol declined. Frequency distributions, medians and means of these continuous CVD risk factors shifted to lower levels, and were mostly statistically significant (p< 0.05).

CONCLUSIONS

Community health promotion can lower key CVD and T2DM risk factors. Lowering tobacco consumption in males and obesity remain challenges in Sri Lanka.

Community Health Workers in Diabetes Prevention and Management in Developing Countries

BACKGROUND

There is limited evidence regarding the effect of community health worker (CHW) interventions for prevention and management of the burgeoning epidemic of noncommunicable diseases (NCDs) in low- and middle-income countries (LMICs). The objective of this review was to critically appraise evidence regarding the effectiveness of CHW interventions for prevention and management of type 2 diabetes mellitus (T2DM) in LMICs.

METHODS

To identify studies that reported the effect of CHW interventions for prevention and management of T2DM in LMICs, Medline/PubMed, EMBASE, Web of Science (Science and Social Science Citation Indices), EBSCO (PsycINFO and CINAHL), POPLINE, the Cochrane Metabolic and Endocrine Disorders Group's Specialized Register, the Cochrane Central Register of Controlled Trials, the Grey literature (Google, Google Scholar), and reference lists of identified articles were searched from inception to May 31, 2017.

FINDINGS

Ten studies were included (4 pre- and post-studies, 2 randomized controlled trials, 2 cohort studies, 1 cross-sectional study, and 1 case-control study). The role of CHWs consisted of patient education, identification and referral of high-risk individuals to physicians, and provision of social support through home visits. Positive outcomes were reported in 7 of 10 studies. These outcomes included increased knowledge of T2DM symptoms and prevention measures; increased adoption of treatment-seeking and prevention measures; increased medication adherence; and improved fasting blood sugar, glycated hemoglobin, and body mass index. Three studies showed no significant outcomes.

CONCLUSIONS

CHWs have the potential to improve knowledge, health behavior, and health outcomes related to prevention and management of T2DM in LMICs. Given the limited number of studies included in this review, robust conclusions cannot be drawn at the present time.

Community health workers for non-communicable diseases prevention and control in developing countries: Evidence and implications

Background

National programs for non-communicable diseases (NCD) prevention and control in different low middle income countries have a strong community component. A community health worker (CHW) delivers NCD preventive services using informational as well as behavioural approaches. Community education and interpersonal communication on lifestyle modifications is imparted with focus on primordial prevention of NCDs and screening is conducted as part of early diagnosis and management. However, the effectiveness of health promotion and screening interventions delivered through community health workers needs to be established.

Objective

This review synthesised evidence on effectiveness of CHW delivered NCD primary prevention interventions in low and middle-income countries (LMICs).

Methods

A systematic review of trials that utilised community health workers for primary prevention/ early detection strategy in the management of NCDs (Diabetes, cardiovascular diseases (CVD), cancers, stroke, Chronic Obstructive Pulmonary Diseases (COPD)) in LMICs was conducted. Digital databases like PubMed, EMBASE, OVID, Cochrane library, dissertation abstracts, clinical trials registry web sites of different LMIC were searched for such publications between years 2000 and 2015. We focussed on community based randomised controlled trial and cluster randomised trials without any publication language limitation. The primary outcome of review was percentage change in population with different behavioural risk factors. Additionally, mean overall changes in levels of several physical or biochemical parameters were studied as secondary outcomes. Subgroup analyses was performed by the age and sex of participants, and sensitivity analyses was conducted to assess the robustness of the findings.

Results

Sixteen trials meeting the inclusion criteria were included in the review. Duration, study populations and content of interventions varied across trials. The duration of the studies ranged from mean follow up of 4 months for some risk factors to 19 months, and primary responsibilities of health workers included health promotion, treatment adherence and follow ups. Only a single trial reported all-cause mortality. The pooled effect computed indicated an increase in tobacco cessation (RR: 2.0, 95%CI: 1.11, 3.58, moderate-quality evidence) and a decrease in systolic blood pressure ((MD: -4.80, 95% CI: -8.12, -1.49, I² = 93%, very low-quality evidence), diastolic blood pressure ((MD: -2.88, 95% CI: -5.65, -0.10, I² = 96%, very low-quality evidence)) and blood sugar levels (glycated haemoglobin MD: -0.83%, 95%CI: -1.25,-0.41). None of the included trials reported on adverse events.

Conclusions

Evidence on the implementation of primary prevention strategies using community health workers is still developing. Existing evidence suggests that, compared with standard care, using CHWs in health programmes have the potential to be effective in LMICs, particularly for tobacco cessation, blood pressure and diabetes control.

Clinical significance of 'cardiometabolic memory': a systematic review of randomized controlled trials

'Cardiometabolic memory' has been proposed based on clinical evidence to explain how, even after the cessation of a clinical trial, the superiority of one treatment over the outcome persists. To understand the cardiometabolic memory phenomenon, we performed a systematic review of randomized controlled trials (RCTs) using PubMed in August 2016. The search terms 'randomized controlled trial', 'post-trial follow-up' and 'diabetes, hypertension or dyslipidemia' were used, and articles published after the year 2000 were searched. We judged the memory phenomenon to be positive when the cardiovascular outcome at the end of the post-trial follow-up period in the intervention group was significantly superior even though the favorable control of a risk factor (blood glucose, blood pressure or lipid level) during the trial period was lost after the cessation of the intervention. Among 907 articles retrieved in the initial screening, 21 articles were judged as describing a positive memory phenomenon. Eight, six and seven of the articles concerned diabetes, hypertension and dyslipidemia, respectively. Transient intensive glucose lowering rather easily induced memory for the suppression of diabetic microangiopathies, while memory for the suppression of macroangiopathies tended to be first evident in the post-trial follow-up period. Transient intensive blood pressure lowering was generally effective in the formation of memory for the suppression of cardiovascular events and had an especially strong impact on risk reduction of chronic heart failure. Transient intensive LDL cholesterol lowering clearly had a long-term beneficial effect on risk reduction of cardiovascular events. Our systematic review revealed the clinical relevance of cardiometabolic memory.

Health Education and General Practitioner Training in Hypertension Management: Long-Term Effects on Kidney Function

BACKGROUND AND OBJECTIVES

In the Control of Blood Pressure and Risk Attenuation trial, a 2×2 factorial design study (2004-2007), the combined home health education and trained general practitioner intervention delivered over 2 years was more effective than no intervention (usual care) in lowering systolic BP among adults with hypertension in urban Pakistan. We aimed to assess the effectiveness of the interventions on kidney function.

DESIGN, PARTICIPANTS, SETTINGS, & METHODS

In 2012-2013, we conducted extended follow-up of a total of 1271 individuals aged ≥40 years with hypertension (systolic BP ≥140 mmHg, diastolic BP ≥90 mmHg, or receipt of antihypertensive treatment) and serum creatinine measurements with 2 years in-trial and 5 years of post-trial period in 12 randomly selected low-income communities in Karachi, Pakistan. The change in eGFR from baseline to 7 years was assessed among randomized groups using a generalized estimating equation method with multiple imputation of missing values.

RESULTS

At 7 years of follow-up, adjusted mean eGFR remained unchanged, with a change of -0.3 (95% confidence interval [95% CI], -3.5 to 2.9) ml/min per 1.73 m(2) among adults randomly assigned to the combined home health education plus trained general practitioner intervention compared with a significant decline of -3.6 (95% CI, -5.7 to -2.0) ml/min per 1.73 m(2) in those assigned to usual care (P=0.01, modified intention-to-treat analysis). The risk for the combined intervention of death from kidney failure or >20% decline in eGFR relative to usual care was significantly reduced (risk ratio, 0.47; 95% CI, 0.25 to 0.89).

CONCLUSIONS

The combined home health education plus trained general practitioner intervention is beneficial in preserving kidney function among adults with hypertension in communities in Karachi. These findings highlight the importance of scaling up simple strategies for renal risk reduction in low- and middle-income countries.