Background: The Hypertension-Stroke Nexus in Sub-Saharan Africa
Stroke remains one of the leading causes of death and disability worldwide, with disproportionate impact in low- and middle-income countries. In sub-Saharan Africa, the dual burden of rising stroke incidence and poorly controlled hypertension creates a particularly challenging clinical scenario. Current data indicate that fewer than 10% of adults living with hypertension in routine care settings ever achieve adequate blood pressure control, placing millions at heightened risk for recurrent vascular events.
The situation is especially critical for stroke survivors, who require stringent blood pressure management to prevent secondary complications. However, healthcare systems in many African nations face significant constraints: limited specialist workforce, restricted access to advanced medications, and challenges in maintaining follow-up care. These realities demand innovative, scalable strategies that can function effectively within existing resource limitations.
The PINGS (Phone-Based Intervention Under Nurse Guidance After Stroke) trial was conceived to address this critical gap. By leveraging mobile health technology and task-shifting to nurses, researchers sought to evaluate whether a structured intervention could meaningfully improve blood pressure outcomes among patients recovering from recent stroke in Ghana.
Study Design and Methodology
The PINGS trial was a multicenter, randomized, open-label study with blinded endpoint evaluation conducted across 10 hospitals in Ghana between October 23, 2020, and April 5, 2024. The trial enrolled 500 participants aged 18 years or older who had experienced a stroke within the preceding month and presented with elevated blood pressure defined as systolic ≥140 mm Hg or diastolic ≥90 mm Hg.
Participants were randomly assigned in a 1:1 ratio to either the intervention or usual care arm. The intervention group received a comprehensive 12-month program comprising several components: home blood pressure self-monitoring paired with nurse case management for elevated readings, phone alarm reminders to support medication adherence, and once-weekly educational audio messages delivered via telephone in local Ghanaian dialects focusing on cardiovascular risk reduction.
Usual care followed standard Ghanaian stroke recovery protocols without additional mHealth support. The primary efficacy endpoint was achievement of systolic blood pressure below 140 mm Hg at 12 months, analyzed according to the intention-to-treat principle. Secondary outcomes included major adverse cardiovascular events and serious adverse events, with medication adherence also assessed as a presumed mediator.
Key Findings: Primary and Secondary Outcomes
The trial achieved its primary endpoint with striking statistical significance. Among 244 participants assigned to the PINGS intervention, 163 (67%) achieved the target systolic blood pressure of less than 140 mm Hg at month 12, compared to only 109 of 256 (43%) participants in the usual care group. This between-group difference of 24 percentage points (95% confidence interval, 15% to 33%; P<0.001) represents a clinically meaningful improvement in blood pressure control.
Quantitative blood pressure changes further supported these findings. The mean change in systolic blood pressure from baseline to month 12 was -5.5 mm Hg in the intervention group (95% CI, -9.6 to -1.4 mm Hg; P=0.008), demonstrating statistically significant reduction compared to usual care.
The participant population was well-balanced between arms, with 43% women and a mean age of 58 years (standard deviation, 11 years). This demographic profile reflects the typical stroke population in sub-Saharan Africa and enhances generalizability of findings to similar settings.
Regarding secondary outcomes, no significant between-group differences emerged in the composite of major adverse cardiovascular events. Interestingly, the presumed mediator of medication adherence also showed no significant difference between groups, suggesting that alternative mechanisms may underlie the observed blood pressure improvements. Serious adverse events occurred in 27 of 244 participants (11.1%) receiving the PINGS intervention versus 18 of 256 (7.0%) in the usual care arm, though this difference did not reach statistical significance (P=0.12).
Mechanistic Insights and Clinical Implications
The finding that medication adherence did not appear to mediate the intervention’s effects raises intriguing questions about how the PINGS program achieved its blood pressure benefits. Several possibilities merit consideration. First, the structured home blood pressure monitoring may have enhanced patient awareness and prompted earlier recognition of uncontrolled readings, enabling timely intervention through the nurse case management component. Second, the weekly educational messages may have fostered broader lifestyle modifications beyond medication-taking behavior, including dietary changes, physical activity, and stress management. Third, the regular telephone contact itself may have provided a supportive relationship component that positively influenced health behaviors.
From a health systems perspective, the PINGS trial exemplifies the principles of task-shifting, a strategy increasingly recognized as essential for expanding healthcare access in resource-constrained environments. By empowering nurses to deliver structured hypertension management support, the intervention utilizes the more abundant non-physician workforce while maintaining clinical effectiveness. This approach aligns with World Health Organization recommendations for task-shifting and could potentially be adapted to other chronic disease management programs.
The mHealth components employed in this trial relied on basic technology rather than sophisticated platforms, enhancing both cost-effectiveness and scalability. Phone alarms for medication reminders and pre-recorded audio messages require minimal infrastructure and could potentially be deployed through standard mobile phones widely available even in rural communities.
Limitations and Future Directions
Several limitations warrant acknowledgment. The open-label design introduces potential bias, though blinded endpoint evaluation mitigates some concerns for objective outcomes like blood pressure measurements. The single-country setting limits immediate generalizability beyond similar African contexts, and longer-term sustainability of benefits beyond 12 months remains uncertain. Additionally, the absence of significant differences in major adverse cardiovascular events may reflect insufficient power or follow-up duration to detect rare events.
Future research should investigate the specific mechanisms driving blood pressure improvements, optimize intervention components, and evaluate cost-effectiveness in diverse healthcare settings. Implementation science approaches could facilitate translation of effective elements into routine practice.
Conclusion
The PINGS trial provides compelling evidence that a nurse-led, mobile health-enhanced intervention can substantially improve blood pressure control among stroke survivors in a resource-limited African setting. The 24-percentage-point absolute difference in achieving target blood pressure represents a meaningful clinical advance with potential to reduce secondary stroke risk. By demonstrating feasibility and efficacy of task-shifting combined with basic mHealth tools, this study offers a pragmatic blueprint for expanding hypertension management capacity in underserved regions. Further validation and implementation studies are warranted to confirm these promising findings and establish optimal strategies for broader deployment.
Funding and Registration
The PINGS trial was registered at ClinicalTrials.gov under the unique identifier NCT04404166. The study received funding support from [funding source not specified in provided abstract]. Full details of the funding structure and author affiliations are available in the original publication.
References
1. Sarfo FS, Akpalu A, Bockarie AS, et al. Phone-Based Intervention Under Nurse Guidance for Control of Hypertension After Stroke: A Randomized Multicenter Phase 3 Trial in Ghana. Circulation. 2026-04-09. PMID: 41953982.
2. World Health Organization. Task Shifting: Rational Redistribution of Tasks among Health Workforce Teams. Geneva: WHO; 2008.
3. WHO Global Hypertension Control Reports and Guidelines.
