Conceptual framework for establishing the African Stroke Organization

Neurology Training and Medical Education in Resource-Limited Settings: Building and Growing the First Neurology Residency Program in East Africa

The burden of neurological disease disproportionately affects low- and middle-income countries, where the lowest number of neurologists are located. Building local training opportunities in resource-limited settings is a foundational step to enhancing the neurological workforce and improving access to neurological care in these regions. In this article, we describe the development and growth of the first neurology residency program in East Africa, which was established in 2006 at Zewditu Memorial Hospital and the Tikur Anbessa Specialized Hospital, Addis Ababa University, Ethiopia. We highlight the impact of the program on clinical care, research, collaborations between neurologists across Ethiopia, and ways to build educational opportunities and mentorship while faced with limited resources. The main challenges in starting the residency program included lack of faculty with neurological expertise, lack of a precedent for subspecialty training in our setting, as well as limited resources and space. The formation of sustainable international collaborations with clinicians at established institutions in high-income countries and neurological societies has been a major source of support in developing the initial infrastructure, curriculum and educational content, knowledge assessments, and mentored research projects. Local partnerships with related medical specialties, including internal medicine, critical care, neurological surgery, and psychiatry, were also instrumental in creating training opportunities. As the program continues to evolve, many challenges remain, including limited diagnostics, lack of access to advanced treatment modalities, lack of fellowship training opportunities in various neurological subspecialties, and insufficient training and experience in scientific writing. Despite these challenges, the residency program has persevered and its creation resulted in many positive changes: since its inception in 2006, we graduated 80 neurologists and the number of practicing neurologists in Ethiopia has increased from 5 to 78, our institution has evolved into a national referral center for neurology, graduates have published 61 articles in the past 3 years and contributed to international neurology research, and alumni of the program have grown the Association of Ethiopian Neurologists. Future directions include development of fellowship opportunities, creation of international rotations, and implementation of teleneurology to further strengthen neurological care across Ethiopia.

Pragmatic solutions to reduce the global burden of stroke: a World Stroke Organization-Lancet Neurology Commission

Stroke is the second leading cause of death worldwide. The burden of disability after a stroke is also large, and is increasing at a faster pace in low-income and middle-income countries than in high-income countries. Alarmingly, the incidence of stroke is increasing in young and middle-aged people (ie, age <55 years) globally. Should these trends continue, Sustainable Development Goal 3.4 (reducing the burden of stroke as part of the general target to reduce the burden of non-communicable diseases by a third by 2030) will not be met.

In this Commission, we forecast the burden of stroke from 2020 to 2050. We project that stroke mortality will increase by 50%—from 6·6 million (95% uncertainty interval [UI] 6·0 million–7·1 million) in 2020, to 9·7 million (8·0 million–11·6 million) in 2050—with disability-adjusted life-years (DALYs) growing over the same period from 144·8 million (133·9 million–156·9 million) in 2020, to 189·3 million (161·8 million–224·9 million) in 2050. These projections prompted us to do a situational analysis across the four pillars of the stroke quadrangle: surveillance, prevention, acute care, and rehabilitation. We have also identified the barriers to, and facilitators for, the achievement of these four pillars. Disability-adjusted life-years (DALYs) The sum of the years of life lost as a result of premature mortality from a disease and the years lived with a disability associated with prevalent cases of the disease in a population. One DALY represents the loss of the equivalent of one year of full health

On the basis of our assessment, we have identified and prioritised several recommendations. For each of the four pillars (surveillance, prevention, acute care, and rehabilitation), we propose pragmatic solutions for the implementation of evidence-based interventions to reduce the global burden of stroke. The estimated direct (ie, treatment and rehabilitation) and indirect (considering productivity loss) costs of stroke globally are in excess of US$891 billion annually. The pragmatic solutions we put forwards for urgent implementation should help to mitigate these losses, reduce the global burden of stroke, and contribute to achievement of Sustainable Development Goal 3.4, the WHO Intersectoral Global Action Plan on epilepsy and other neurological disorders (2022–2031), and the WHO Global Action Plan for prevention and control of non-communicable diseases.

Reduction of the global burden of stroke, particularly in low-income and middle-income countries, by implementing primary and secondary stroke prevention strategies and evidence-based acute care and rehabilitation services is urgently required. Measures to facilitate this goal include: the establishment of a framework to monitor and assess the burden of stroke (and its risk factors) and stroke services at a national level; the implementation of integrated population-level and individual-level prevention strategies for people at any increased risk of cerebrovascular disease, with emphasis on early detection and control of hypertension; planning and delivery of acute stroke care services, including the establishment of stroke units with access to reperfusion therapies for ischaemic stroke and workforce training and capacity building (and monitoring of quality indicators for these services nationally, regionally, and globally); the promotion of interdisciplinary stroke care services, training for caregivers, and capacity building for community health workers and other health-care providers working in stroke rehabilitation; and the creation of a stroke advocacy and implementation ecosystem that includes all relevant communities, organisations, and stakeholders.

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Stroke in Africa: A systematic review and meta-analysis of the incidence and case-fatality rates

BACKGROUND

The burden of stroke (a leading cause of disability and mortality) in Africa appears to be increasing, but a systematic review of the best available data to support or refute this observation is lacking.

AIM

To determine the incidence and 1-month case-fatality rates from high-quality studies of stroke epidemiology among Africans.

SUMMARY OF REVIEW

We searched and retrieved eligible articles on stroke epidemiology among indigenous Africans in bibliographic databases (MEDLINE, ScienceDirect, Google Scholar, and Cochrane library) using predefined search terms from the earliest records through January 2022. Methodological assessment of eligible studies was conducted using the Newcastle-Ottawa scale. Pooling of incidence and case-fatality rates was performed via generalized linear models (Poisson-Normal random-effects model). Of the 922 articles retrieved, 14 studies were eligible for inclusion. The total number of stroke cases was 2568, with a population denominator (total sample size included in population-based registries or those who agreed to participate in door-to-door community studies) of 3,384,102. The pooled crude incidence rate of stroke per 100,000 persons in Africa was 106.49 (95% confidence interval (CI) = 58.59-193.55), I2 = 99.6%. The point estimate of the crude incidence rate was higher among males, 111.33 (95% CI = 56.31-220.12), I2 = 99.2%, than females, 91.14 (95% CI = 47.09-176.37), I2 = 98.9%. One-month case-fatality rate was 24.45 (95% CI = 16.84-35.50), I2 = 96.8%, with lower estimates among males, 22.68 (95% CI = 18.62-27.63), I2 = 12.9%, than females, 27.57 (95% CI = 21.47-35.40), I2 = 51.6%.

CONCLUSION

The burden of stroke in Africa remains very high. However, little is known about the dynamics of stroke epidemiology among Africans due to the dearth of high-quality evidence. Further continent-wide rigorous epidemiological studies and surveillance programs using the World Health Organization STEPwise approach to Surveillance (WHO STEPS) framework are needed.

Patient-level and system-level determinants of stroke fatality across 16 large hospitals in Ghana and Nigeria: a prospective cohort study

BACKGROUND

Every minute, six indigenous Africans develop new strokes. Patient-level and system-level contributors to early stroke fatality in this region are yet to be delineated. We aimed to identify and quantify the contributions of patient-level and system-level determinants of inpatient stroke fatality across 16 hospitals in Ghana and Nigeria.

METHODS

The Stroke Investigative Research and Educational Network (SIREN) is a multicentre study involving 16 sites in Ghana and Nigeria. Cases include adults (aged ≥18 years) with clinical and radiological evidence of an acute stroke. Data on stroke services and resources available at each study site were collected and analysed as system-level factors. A host of demographic and clinical variables of cases were analysed as patient-level factors. A mixed effect log-binomial model including both patient-level and system-level covariates was fitted. Results are presented as adjusted risk ratios (aRRs) with respective 95% CIs.

FINDINGS

Overall, 814 (21·8%) of the 3739 patients admitted with stroke died as inpatients: 476 (18·1%) of 2635 with ischaemic stroke and 338 (30·6%) of 1104 with intracerebral haemorrhage. The variability in the odds of stroke fatality that could be attributed to the system-level factors across study sites assessed using model intracluster correlation coefficient was substantial at 7·3% (above a 5% threshold). Stroke units were available at only five of 16 centres. The aRRs of six patient-level factors associated with stroke fatality were: low vegetable consumption, 1·19 (95% CI 1·07-1·33); systolic blood pressure, 1·02 (1·01-1·04) for each 10 mm Hg rise; stroke lesion volume more than 30 cm3, 1·48 (1·22-1·79); National Institutes of Health Stroke Scale (NIHSS) score, 1·20 (1·13-1·26) for each 5-unit rise; elevated intracranial pressure, 1·75 (1·31-2·33); and aspiration pneumonia, 1·79 (1·16-2·77).

INTERPRETATION

Studies are needed to assess the efficacy of interventions targeting patient-level factors such as aspiration pneumonia in reducing acute stroke fatality in this region. Policy directives to improve stroke unit access are warranted.

FUNDING

US National Institutes of Health.

TRANSLATIONS

For the Twi, Yoruba and Hausa translations of the abstract see Supplementary Materials section.

ASOC Osuntokun Award Lecture 2022: Partnership for stroke prevention and treatment in Africa: Qualitative research processes and findings

BACKGROUND/OBJECTIVES

Africa has one of the highest rates of stroke and stroke deaths in the world. The burden of stroke is increasing with a 3-year mortality rate of up to 84%. Stroke disproportionately affects the young and middle-aged population contributing to morbidity and mortality affecting families, communities, health systems, and economic progress. My objectives of the 2022 Osuntokun Award Lecture at the African Stroke Organization Conference were to explore our qualitative research findings from our communities and to propose future qualitative methods for improving stroke outcomes in Africa.

METHODS

Qualitative research processes and findings related to stroke prevention, treatment/ongoing care, recovery, and knowledge and attitudes influencing ethical, legal and social implications related to stroke neuro-biobanking were explored. For each qualitative study, methods were developed by the research team including: (1) plans to implement aims and ethics review; (2) guides and detailed steps for implementation; (3) training for team; (4) pilot testing, data collection, transport, transcription, storage; (5) data analysis and manuscript development.

RESULTS

The research focused on genetics, genomics and phenomics of stroke and more recently on exploring the ethical, legal, and social implications of stroke neuro-biobanking. All included a qualitative component to obtain input and guidance from the community. As in quantitative research, questions were developed by the research team, reviewed for clarity by a small group of community members, and 1,289 community members (ages 22-85) participated in the focus groups and key informant interviews from 2014 through 2022. Answers to questions were diverse with some knowledgeable about the science of stroke prevention and treatment, but many had ideas about prevention and causes of stroke that were not supported by science and many reported using traditional healers for treatment and religious beliefs preventing brain biobanking.

CONCLUSIONS

In addition to our current qualitative research related to stroke in Africa and beyond, we must form research partnerships with communities that not only answer researchers' and community members' questions but identify and implement ways to prevent stroke and improve stroke outcomes.

Proportion of stroke types in Madagascar: A tertiary-level hospital-based case series

BACKGROUND

Like other countries in sub-Saharan Africa, Madagascar has a high burden of stroke. The Malagasy population is unique in sharing both African and Asian ancestry. The proportion of ischemic and hemorrhagic stroke types is unknown for this population.

AIM

Our aim was to establish the proportion of stroke types and known risk factors for the Malagasy population.

METHODS

We conducted a single-center, tertiary-level hospital-based case series. We included all patients with a CT-imaging confirmed stroke who presented at the emergency ward of the study hospital between January 1, 2017, and November 20, 2018.

RESULTS

Of 223 patients with CT-confirmed stroke, 57.4% (128/223, 95% CI: 51-64%) had an ischemic stroke and 42.6% (95/223, 95% CI: 36-49%) had an intracranial hemorrhage. The majority (89.5%; 85/95, 95% CI: 83-96%) of intracranial hemorrhages were intracerebral; 4.2% (4/95, 95% CI: 0-8%) had a subdural hematoma, 5.3% (5/95, 95% CI: 1-10%) had a subarachnoid hemorrhage, there was one isolated intraventricular hemorrhage (1.1%; 1/95, 95% CI: -1-3%). The prevalence of hypertension among stroke patients was high (86.6%; 187/216, 95% CI: 82-91%).

CONCLUSIONS

Our study is the first to report the proportion of stroke types and known risk factors in Madagascar. We find that the proportion of hemorrhagic strokes was unexpectedly higher than that reported from other countries in sub-Saharan Africa. Our findings highlight the need for a country-specific approach to stroke prevention, treatment, and rehabilitation and provide guidance on public health resource allocation in Madagascar.

Osuntokun Award Lecture 2021: Challenges of Measuring the Burden of Stroke in Africa

BACKGROUND

Over recent years non-communicable diseases have dramatically increased in low- and middle-income countries, including those of sub-Saharan Africa. With continuing high levels of infectious disease, these countries now face the double burden of disease. Stroke has emerged as a major cause of hospital admission, disability, and mortality for which the major modifiable risk factor is hypertension, which is often not diagnosed and, even if diagnosed, not treated and, even if treated, not controlled.

METHODS

In this award lecture paper I outline my personal experience of measuring the burden of, and risk factors for, stroke in sub-Saharan Africa, along with the challenges faced. I will specifically describe the measurement of mortality and case fatality, prevalence and incidence as well as commenting on aetiology and risk factors and reflect on future initiatives and directions.

RESULTS

Over the past 5 decades there has been a dramatic increase in numbers of stroke patients admitted to hospital throughout sub-Saharan Africa, with high in hospital mortality rates, also reflected in high case fatality rates in those cohorts followed up following discharge from hospital. Community-based surveys assessing mortality from stroke using verbal autopsy have demonstrated very high age-adjusted rates. Age adjusted prevalence rates assessed by door-to-door surveys have generally shown lower prevalence than high income countries. The Tanzanian stroke incidence study, which incorporated verbal autopsy for those patients dying before reaching hospital, demonstrated some of the highest age-adjusted stroke incidence rates in the world. There were high rates of stroke in younger ages and high rates of intracranial haemorrhage though not as high as previously shown in hospital-based studies. Hypertension is the main modifiable risk factor but other risk factors such as HIV are important while, certainly in rural populations, raised cholesterol remains rare as does carotid artery stenosis and history of transient ischemic attack. Other vascular disease such as ischemic heart disease and peripheral vascular disease is also less common.

CONCLUSIONS

There is already a large burden relating to stroke in sub-Saharan Africa and this will only escalate further as the population ages. Hypertension is the biggest risk factor for mortality worldwide and in sub-Saharan Africa prevalence rates are very high with the majority of people suffering with stroke not being diagnosed with their hypertension prior to their stroke. The most important challenge is to improve primary prevention for which improving diagnosis and control rates for hypertension is the number one priority. For those who do have stroke there is a need to increase the number of suitably staffed stroke units as these have been shown to have a very large impact on improving both mortality and morbidity in high income countries. There are still many unanswered questions and a need for more research throughout sub-Saharan Africa on risk factors, and treatment, for stroke.

The African Stroke Organization Conference 2021: Building Capacity, Careers, Collaborations, and Contributions

The inaugural African Stroke Organization Conference (ASOC) aimed to create a forum to discuss the latest stroke science, highlight opportunities to address the high burden of stroke in Africa, develop a viable pipeline of emerging African stroke researchers, honor leading scientists and policy makers, and provide networking avenues to bolster future collaboration. Using a virtual platform, ASOC was held from Nov 3-4, 2021, and was attended by 236 participants. ASOC 2021 sessions included: (1) Osuntokun Award Lecture delivered by Prof. Richard Walker of Newcastle University; (2) Distinguished Policy Maker Lecture delivered by Dr. Raj Tajudeen of the African Centers for Disease Control and Prevention; (3) Invited presentations by prominent global stroke academicians on acute stroke, vascular malformations, vascular brain injury, Covid-19, nursing/allied care, rehabilitation/recovery, health services, imaging, pediatric stroke, precision medicine, and unusual causes of stroke; (4) six oral scientific abstract presentations; and (5) fifteen moderated oral poster presentations. Other sessions were (i) Vascular Brain Trust where early career African scholars presented manuscripts and grant proposals under development for feedback from seasoned researchers (ii) Moving on Up during which presentations were given to early career scholars about pathways for success in funding and advancement. A capstone event was the Frontiers of Research in Africa session which showcased the work and capabilities of 20 scientists and sites in Africa. All the ASOC sessions were lively and post-conference feedback from attendees showed high levels of satisfaction for the conference platforms and content. The ASOC marks a new dawn in the era of an escalating stroke burden in Africa, and it is anticipated to serve as a catalyst for exponentially building the capacity, careers, collaborations, and contributions of Africans to ameliorating stroke within and beyond the continent.

The 2021 William Feinberg Award Lecture Seeking Glocal Solutions to Cerebrovascular Health Inequities

Global and local (“glocal”) disparities in stroke incidence, prevalence, care, and mortality are persistent, pervasive, and progressive. In particular, the disproportionate burden of stroke in people of African ancestry compared to most other racial/ethnic groups around the world has been long standing, is expected to worsen, and so far, has defied solution, largely because conventional risk factors likely account for less than half of the Black versus White disparity in stroke outcomes. While hypotheses such as a differential impact or inadequate evaluation of traditional risk factors by race have been suggested as potentially key factors contributing to lingering racial/ethnic stroke disparities, relatively understudied novel risk factors such as psychosocial stress, environmental pollution, and inflammation; and influences of the social determinants of health are gaining the most attention (and momentum). Moreover, it is increasingly recognized that while there is a lot still to understand, there needs to be a major shift from incessantly studying the problem, to developing interventions to resolve it. Resolution will likely require targeting multilevel factors, considering contemporaneous cross-national and cross-continental data collection, creating scalable care delivery models, jointly addressing care quality and community drivers of stroke occurrence, incorporating policy makers in planning/dissemination of successful interventions, and investing in robust transdisciplinary research training programs that address the interrelated issues of health equity and workforce diversity, and regional capacity building. To this end, our international multidisciplinary team has been involved in conducting several epidemiological studies and clinical trials in the area of stroke disparities, as well as executing career enhancing research training programs in the United States and Africa. This award lecture paper shares some of the lessons we have learnt from previous studies, presents objectives/design of ongoing initiatives, and discusses plans for the future.

Influence of age on links between major modifiable risk factors and stroke occurrence in West Africa

Background The burden of stroke in Africa is high. Understanding how age associates with major modifiable stroke risk factors could inform tailored demographic stroke prevention strategies. Purpose To quantify the magnitude and direction of the effect sizes of key modifiable stroke risk factors according to three age groups: <50 years (young), 50-65 years (middle age) and > 65 years (elderly) in West Africa. Methods This was a case-control study involving 15 sites in Ghana and Nigeria. Cases included adults aged ≥18 years with CT/MRI scan-typed stroke. Controls were age-and gender-matched stroke-free adults. Detailed evaluations for vascular, lifestyle and psychosocial factors were performed. We estimated adjusted odds ratios (aOR) using conditional logistic regression and population attributable risk (PAR) with 95% Confidence Interval of vascular risk factors by age groups. Results Among 3553 stroke cases, 813 (22.9%) were young, 1441 (40.6%) were middle-aged and 1299 (36.6%) were elderly. Among the 5 co-shared risk factors, dyslipidemia with PAR and aOR (95%CI) of 62.20% (52.82-71.58) and 4.13 (2.64-6.46) was highest among the young age group; hypertension with PAR of 94.31% (91.82-96.80) and aOR of 28.93 (15.10-55.44) was highest among the middle-age group. Diabetes with PAR of 32.29%(27.52-37.05) and aOR of 3.49 (2.56-4.75); meat consumption with PAR of 42.34%(32.33-52.35) and aOR of 2.40 (1.76, 3.26); and non-consumption of green vegetables, PAR of 16.81%(12.02-21.60) and aOR of 2.23 (1.60-3.12) were highest among the elderly age group. However confidence intervals of risk estimates overlapped across age groups. Additionally, among the young age group cigarette smoking, psychosocial stress and cardiac disease were independently associated with stroke. Furthermore, education, stress, physical inactivity and salt intake were associated with stroke in the middle-age group while cardiac disease was associated with stroke in the elderly age group. Conclusion There is a differential influence of age on the associations of major risk factors with stroke in this West African cohort. Targeting modifiable factors predominant within an age group may be more effective as a stroke prevention strategy.

Stroke case fatality in sub-Saharan Africa: Systematic review and meta-analysis

Background

The burden of stroke is high in sub-Saharan Africa; however, few data are available on long-term mortality.

Objective

To estimate over one-month stroke case fatality in sub-Saharan Africa.

Methods

A systematic review and meta-analysis were performed according to meta-analysis of observational studies in epidemiology and Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines (PROSPERO protocol: CRD42020192439), on five electronic databases (PubMed, Science direct, AJOL, EMBASE, and Web of Sciences). We searched all studies on stroke case fatality over one month in sub-Saharan Africa published between 1st January 2000 and 31st December 2019.

Results

We included 91 studies with a total of 34,362 stroke cases. The one-month pooled stroke case-fatality rate was 24.1% [95% CI: 21.5–27.0] and 33.2% [95% CI: 23.6–44.5] at one year. At three and five years, the case-fatality rates were respectively 40.1% [95% CI: 20.8–63.0] and 39.4% [95% CI: 14.3–71.5] with high heterogeneity. Hemorrhagic stroke was associated with a higher risk of mortality at one month, but ischemic stroke increased the risk of mortality over six months. Diabetes was associated with poor prognosis at 6 and 12 months with odds ratios of 1.64 [95% CI: 1.22–2.20] and 1.85 [1.25–2.75], respectively.

Conclusion

The stroke case fatality over one month was very high, compared to case fatalities reported in Western countries and can be explained by a weak healthcare systems and vascular risk factors.

Stroke in Africa: profile, progress, prospects and priorities

Stroke is a leading cause of disability, dementia and death worldwide. Approximately 70% of deaths from stroke and 87% of stroke-related disability occur in low-income and middle-income countries. At the turn of the century, the most common diseases in Africa were communicable diseases, whereas non-communicable diseases, including stroke, were considered rare, particularly in sub-Saharan Africa. However, evidence indicates that, today, Africa could have up to 2-3-fold greater rates of stroke incidence and higher stroke prevalence than western Europe and the USA. In Africa, data published within the past decade show that stroke has an annual incidence rate of up to 316 per 100,000, a prevalence of up to 1,460 per 100,000 and a 3-year fatality rate greater than 80%. Moreover, many Africans have a stroke within the fourth to sixth decades of life, with serious implications for the individual, their family and society. This age profile is particularly important as strokes in younger people tend to result in a greater loss of self-worth and socioeconomic productivity than in older individuals. Emerging insights from research into stroke epidemiology, genetics, prevention, care and outcomes offer great prospects for tackling the growing burden of stroke on the continent. In this article, we review the unique profile of stroke in Africa and summarize current knowledge on stroke epidemiology, genetics, prevention, acute care, rehabilitation, outcomes, cost of care and awareness. We also discuss knowledge gaps, emerging priorities and future directions of stroke medicine for the more than 1 billion people who live in Africa.

Towards evidence-based policies to strengthen acute stroke care in low-middle-income countries

Stroke is a major public health issue in many low- and middle-income countries (LMICs). Despite the emergence of new effective interventions for acute stroke care, uptake remains slow and largely inaccessible to patients in LMICs, where health systems response has been inadequate. In this paper, we propose a policy framework to optimise access to acute stroke care in LMICs. We draw on evidence from relevant primary studies, such as availability of evidence-based acute stroke care interventions, barriers to uptake of interventions for stroke care and insights on stroke mortality and morbidity burden in LMICs. Insights from review of secondary studies, principally systematic reviews on evidence-based acute stroke care; and the accounts and experiences of some regional experts on stroke and other NCDs have been taken into consideration. In LMICs, there is limited availability and access to emergency medical transport services, brain imaging services and best practice interventions for acute stroke care. Availability of specialist acute stroke workforce and low awareness of early stroke signs and symptoms are also major challenges impeding the delivery of quality stroke care services. As a result, stroke care in LMICs is patchy, fragmented and often results in poor patient outcomes. Reconfiguration of LMIC health systems is thus required to optimise access to quality acute stroke care. We therefore propose a ten-point framework to be adapted to country-specific health system capacity, needs and resources: Emergency medical transport and treatment services, scaling-up interventions and services for acute stroke care, clinical guidelines for acute stroke treatment and management, access to brain imaging services, human resource capacity development strategies, centralisation of stroke services, tele-stroke care, public awareness campaigns on early stroke symptoms, establish stroke registers and financing of stroke care in LMICs. While we recognise the challenges of implementing the recommendations in low resource settings, this list can provide a platform as well serve as the starting point for advocacy and prioritisation of interventions depending on context.