James Kayima

Hypertension awareness, treatment and control in Africa: a systematic review

BackgroundInadequate diagnosis and suboptimal control of hypertension is a major driver of cardiovascular morbidity and mortality in Africa. Understanding the levels of awareness, treatment and control of hypertension and the associated factors has important implications for hypertension control efforts.MethodsThe PubMed database was searched for original articles related to awareness, treatment and control of hypertension in Africa published between 1993 and 2013. The key search terms were: Africa, awareness, treatment, control, and hypertension. Exploration of bibliographies cited in the identified articles was done to provide further studies. Full texts of the articles were obtained from various internet sources and individual authors. A data extraction sheet was used to collect this information.ResultsThirty eight studies drawn from 23 African countries from all regions of the continent met the inclusion criteria. The levels of awareness, treatment and control varied widely from country to country. Rural populations had lower levels of awareness than urban areas. North African countries had the highest levels of treatment in the continent. There was generally poor control of hypertension across the region even among subjects that were aware of their status and those that were treated. On the whole, the women had a better control status than the men.ConclusionThere are low levels of awareness and treatment of hypertension and even lower levels of control. Tailored research is required to uncover specific reasons behind these low levels of awareness and treatment, and especially control, in order to inform policy formulation for the improvement of outcomes of hypertensive patients in Africa.

Single-Trait and Multi-Trait Genome-Wide Association Analyses Identify Novel Loci for Blood Pressure in African-Ancestry Populations

Hypertension is a leading cause of global disease, mortality, and disability. While individuals of African descent suffer a disproportionate burden of hypertension and its complications, they have been underrepresented in genetic studies. To identify novel susceptibility loci for blood pressure and hypertension in people of African ancestry, we performed both single and multiple-trait genome-wide association analyses. We analyzed 21 genome-wide association studies comprised of 31,968 individuals of African ancestry, and validated our results with additional 54,395 individuals from multi-ethnic studies. These analyses identified nine loci with eleven independent variants which reached genome-wide significance (P < 1.25×10−8) for either systolic and diastolic blood pressure, hypertension, or for combined traits. Single-trait analyses identified two loci (TARID/TCF21 and LLPH/TMBIM4) and multiple-trait analyses identified one novel locus (FRMD3) for blood pressure. At these three loci, as well as at GRP20/CDH17, associated variants had alleles common only in African-ancestry populations. Functional annotation showed enrichment for genes expressed in immune and kidney cells, as well as in heart and vascular cells/tissues. Experiments driven by these findings and using angiotensin-II induced hypertension in mice showed altered kidney mRNA expression of six genes, suggesting their potential role in hypertension. Our study provides new evidence for genes related to hypertension susceptibility, and the need to study African-ancestry populations in order to identify biologic factors contributing to hypertension.

Presenting features of newly diagnosed rheumatic heart disease patients in Mulago Hospital: a pilot study

INTRODUCTION Rheumatic heart disease (RHD) continues to cause gross distortions of the heart and the associated complications of heart failure and thromboembolic phenomena in this age of numerous high-efficacy drugs and therapeutic interventions. Due to the lack of contemporary local data, there is no national strategy for the control and eradication of the disease in Uganda. This study aimed to describe the presenting clinical features of newly diagnosed patients with RHD, with particular reference to the frequency of serious complications (atrial fibrillation, systemic embolism, heart failure and pulmonary hypertension) in the study group. METHODS One hundred and thirty consecutive patients who satisfied the inclusion criteria were recruited over a period of eight months from June 2011 to January 2012 at the Mulago Hospital, Uganda. Data on demographic characteristics, disease severity and presence of complications were collected by means of a standardised questionnaire. RESULTS Seventy-one per cent of the patients were female with a median age of 33 years. The peak age of the study group was 20 to 39 years, with the commonest presenting symptoms being palpitations, fatigue, chest pain and dyspnoea. The majority of the patients presented with moderate-to-severe valvular disease. Pure mitral regurgitation was the commonest valvular disease (40.2%), followed by mitral regurgitation plus aortic regurgitation (29%). Mitral regurgitation plus aortic regurgitation plus mitral stenosis was found in 11% of patients. There was only one case involving the tricuspid valve. The pulmonary valves were not affected in all patients; 45.9% of patients presented in severe heart failure in NYHA class III/IV, 53.3% had pulmonary hypertension, 13.9% had atrial fibrillation and 8.2% had infective endocarditis. All patients presented with dilated atria (> 49 mm). CONCLUSION A significant proportion of RHD patients present to hospital with severe disease associated with severe complications of advanced heart failure, pulmonary hypertension, infective endocarditis and atrial fibrillation. There is a need to improve awareness of the disease among the population, and clinical suspicion in primary health workers, so that early referral to specialist management can be done before severe damage to the heart ensues.

Socioeconomic and environmental risk factors among rheumatic heart disease patients in Uganda.

Background Although low socioeconomic status, and environmental factors are known risk factors for rheumatic heart disease in other societies, risk factors for rheumatic heart disease remain less well described in Uganda. Aims and Objective The objective of this study was to investigate the role of socio-economic and environmental factors in the pathogenesis of rheumatic heart disease in Ugandan patients. Methods This was a case control study in which rheumatic heart disease cases and normal controls aged 5–60 years were recruited and investigated for socioeconomic and environmental risk factors such as income status, employment status, distance from the nearest health centre, number of people per house and space area per person. Results 486 participants (243 cases and 243 controls) took part in the study. Average age was 32.37+/−14.6 years for cases and 35.75+/−12.6 years for controls. At univariate level, Cases tended to be more overcrowded than controls; 8.0+/−3.0 versus 6.0+/−3.0 persons per house. Controls were better spaced at 25.2 square feet versus 16.9 for cases. More controls than cases were employed; 45.3% versus 21.1%. Controls lived closer to health centers than the cases; 4.8+/−3.8 versus 3.3+/−12.9 kilometers. At multivariate level, the odds of rheumatic heart disease was 1.7 times higher for unemployment status (OR = 1.7, 95% CI = 1.05–8.19) and 1.3 times higher for overcrowding (OR = 1.35, 95% CI = 1.1–1.56). There was interaction between overcrowding and longer distance from the nearest health centre (OR = 1.20, 95% CI = 1.05–1.42). Conclusion The major findings of this study were that there was a trend towards increased risk of rheumatic heart disease in association with overcrowding and unemployment. There was interaction between overcrowding and distance from the nearest health center, suggesting that the effect of overcrowding on the risk of acquiring rheumatic heart disease increases with every kilometer increase from the nearest health center.

Stroke-Risk Factors Differ between Rural and Urban Communities: Population Survey in Central Uganda.

Background: Socioeconomic transition is changing stroke risk factors in Sub-Saharan Africa. This study assessed stroke-risk factors and their associated characteristics in urban and rural Uganda. Methods: We surveyed 5,420 urban and rural participants and assessed the stroke-risk factor prevalence and socio-behavioural characteristics associated with risk factors. Results: Rural participants were older with higher proportions of men and fewer poor compared to urban areas. The most prevalent modifiable stroke-risk factors in all areas were hypertension (27.1% rural and 22.4% urban, p = 0.004), overweight and obesity (22.0% rural and 42% urban, p < 0.0001), and elevated waist hip ratio (25.8% rural and 24.1% urban, p = 0.045). Diabetes, smoking, physical inactivity, harmful alcohol consumption were found in ≤5%. Age, family history of hypertension, and waist hip ratio were associated with hypertension in all, while BMI, HIV were associated with hypertension only in urban dwellers. Sex and family history of hypertension were associated with BMI in all, while age, socio-economic status and diabetes were associated with BMI only in urban dwellers. Conclusions: The prevalence of stroke-risk factors of diabetes, smoking, inactivity and harmful alcohol consumption was rare in Uganda. Rural dwellers belonging to a higher age group tended to be with hypertension and elevated waist hip ratio. Unlike high-income countries, higher socioeconomic status was associated with overweight and obesity.

Community knowledge of and attitudes toward epilepsy in rural and urban Mukono district, Uganda: A cross-sectional study

INTRODUCTION The lack of adequate knowledge poses a barrier in the provision of appropriate treatment and care of patients with epilepsy within the community. The purpose of this study was to determine the knowledge of and attitude towards epilepsy and its treatment by community dwellers in Uganda. METHODS A cross sectional population survey was conducted in urban and rural Mukono district, central Uganda. Adult respondents through multistage stratified sampling were interviewed about selected aspects of epilepsy knowledge, attitudes, and perception using a pretested structured questionnaire. RESULTS Ninety-one percent of the study respondents had heard or read about epilepsy or knew someone who had epilepsy and had seen someone having a seizure. Thirty-seven percent of the respondents did not know the cause of epilepsy, while 29% cited genetic causes. About seventeen percent of the subjects believed that epilepsy is contagious. Only 5.6% (21/377) of the respondents would take a patient with epilepsy to hospital for treatment. CONCLUSION Adults in Mukono are very acquainted with epilepsy but have many erroneous beliefs about the condition. Negative attitudes are pervasive within communities in Uganda. The national epilepsy awareness programs need to clarify the purported modes of transmission of epilepsy, available treatment options, and care offered during epileptic seizures during community sensitizations in our settings.

Determinants of Hypertension in Urban Uganda: A Community-Based Case-Control Study

OBJECTIVE Rapid urbanization is changing the epidemiology of non-communicable diseases in sub-Saharan Africa. We aimed to identify the determinants of raised blood pressure in urban Uganda to highlight targets for preventive interventions. DESIGN Case-control. SETTING Three community-based sites in Kampala, the capital of Uganda. PARTICIPANTS Participants were eligible to enroll if they were aged ≥18 years and not pregnant. METHODS 450 cases with raised blood pressure were frequency matched by sex and age to 412 controls. Unconditional logistic regression was used to evaluate the association of socio-demographic, lifestyle, anthropometric, and laboratory variables with the outcome of raised blood pressure. Cases currently treated with antihypertensive medication and cases not treated with antihypertensive medication were analyzed separately. RESULTS Significantly increased odds of raised blood pressure were associated with overweight body mass index (BMI) (25 kg/m2 ≤ BMI < 30 kg/m2), obese BMI (BMI ≥ 30 kg/m2) and hemoglobin A1c ≥ 6.5%. Significantly decreased odds of raised blood pressure were associated with moderate-to-vigorous work-related physical activity of >4 hours/week. No significant associations were found between raised blood pressure and marital status, education level, car or flush toilet ownership, dietary habits, alcohol consumption, smoking habits, moderate-to-vigorous leisure-related physical activity > 4 hours/week, waist-to-hip ratio, or total cholesterol levels. CONCLUSIONS Targeted interventions are needed to address the key modifiable risk factors for raised blood pressure identified in this study, namely elevated BMI and regular physical activity, in order to reduce the burden of cardiovascular disease in urban Uganda.

A cross-sectional population survey on stroke knowledge and attitudes in Greater Kampala, Uganda

Abstract Background: Stroke is a neurological condition with rapidly increasing burden in many low- and middle income countries. Africa is particularly hard-hit due to rapid population growth, patterns of industrialization, adoption of harmful western diets, and increased prevalence of risk factors such as hypertension and obesity. Reducing stroke risk factors and teaching people to respond to stroke warning signs can prevent stroke and reduce burden. However, being able to address gaps in knowledge and improving both preventative and early-response care requires a clear understanding of practical and potentially modifiable topics. In this cross sectional study, we assessed the knowledge and attitudes among an urban population residing within the greater Kampala, Uganda. Methods: A population cross sectional survey was conducted in urban Mukono, district, central Uganda. Through the systematic sampling method, data were gathered from 440 adult participants who were interviewed about selected aspects of stroke knowledge, attitudes and perception using a pretested structured questionnaire. Results: A total of 440 study participants were enrolled. The leading risk factors for stroke identified by the participants were stress (75.7%) and hypertension (45.2%) respectively. Only two (0.5%) of the study participants identified cigarette smoking as a stroke risk factor. Individuals with hypertension have poor knowledge regarding stroke in spite their high risk for stroke. Conclusion: Stroke knowledge is poor while, stress and hypertension are the leading perceived risk factors in our settings. While stress is contributing factor, hypertension is likely a more amenable and practical intervention target. Targeting individuals with stroke risk factors to increase stroke knowledge and education is crucial for engagement in healthcare. Implementing a self-management program to support and motivate this high-risk group as well as adopting healthy life-styles may be a way to reduce stroke burden in Uganda.

Association of genetic variation with blood pressure traits among East Africans.

Genetic variation may play explain some of the disparity in prevalence and control of hypertension across Sub‐Saharan Africa. However, there have been very few studies to characterize genetic variation of blood pressure traits.

Effect of a 72 Hour Stroke Care Bundle on Early Outcomes after Acute Stroke: A Non Randomised Controlled Study

Background Integrated care pathways (ICP) in stroke management are increasingly being implemented to improve outcomes of acute stroke patients. We evaluated the effect of implementing a 72 hour stroke care bundle on early outcomes among patients admitted within seven days post stroke to the national referral hospital in Uganda. Methods In a one year non-randomised controlled study, 127 stroke patients who had ‘usual care’ (control group) were compared to 127 stroke patients who received selected elements from an ICP (intervention group). Patients were consecutively enrolled (controls first, intervention group second) into each group over 5 month periods and followed to 30-days post stroke. Incidence outcomes (mortality and functional ability) were compared using chi square test and adjusted for potential confounders. Kaplan Meier survival estimates and log rank test for comparison were used for time to death analysis for all strokes and by stroke severity categories. Secondary outcomes were in-hospital mortality, median survival time and median length of hospital stay. Results Mortality within 7 days was higher in the intervention group compared to controls (RR 13.1, 95% CI 3.3–52.9). There was no difference in 30-day mortality between the two groups (RR 1.2, 95% CI 0.5–2.6). There was better 30-day survival in patients with severe stroke in the intervention group compared to controls (P = 0.018). The median survival time was 30 days (IQR 29–30 days) in the control group and 30 days (IQR 7–30 days) in the intervention group. In the intervention group, 41patients (32.3%) died in hospital compared to 23 (18.1%) in controls (P < 0.001). The median length of hospital stay was 8 days (IQR 5–12 days) in the controls and 4 days (IQR 2–7 days) in the intervention group. There was no difference in functional outcomes between the groups (RR 0.9, 95% CI 0.4–2.2). Conclusions While implementing elements of a stroke-focused ICP in a Ugandan national referral hospital appeared to have little overall benefit in mortality and functioning, patients with severe stroke may benefit on selected outcomes. More research is needed to better understand how and when stroke protocols should be implemented in sub-Saharan African settings. Trial Registration Pan African Clinical Trials Registry PACTR201510001272347