Ruan Kruger

Prof. Ruan Kruger

Hypertension in Africa Research Team (HART), North-West University, Potchefstroom, North West, South Africa
orcid
DSI-NRF SARChI Research Chair | President of the CHCSA

Research Focus & Metrics

Academic Career Length

16Years (2011-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 July 2016 in Journal Of Hypertension
Verified
Journal Article
Closed access
SGSara V. Greve
Sara V. Greve
MBMarie K. Blicher
Marie K. Blicher
Ruan KrugerRuan Kruger
Ruan Kruger
TSThomas Sehestedt
Thomas Sehestedt
EGEva Gram-Kampmann
Eva Gram-Kampmann
MOMichael H. Olsen
Michael H. Olsen
Background: Carotid–femoral pulse wave velocity (cfPWV) adds significantly to traditional cardiovascular risk prediction, but is not widely available. Therefore, it would be helpful if cfPWV could be replaced by an estimated carotid–femoral pulse wave velocity (ePWV) using age and mean blood pressure, and previously published equations. The aim of this study was to investigate whether ePWV could predict cardiovascular events independently of traditional cardiovascular risk factors and/or cfPWV. Method: cfPWV was measured and ePWV was calculated in 2366 patients from four age groups of the Danish MONICA10 cohort. Additionally, the patients were divided into four cardiovascular risk groups based on Systematic COronary Risk Evaluation (SCORE) or Framingham risk score (FRS). In 2006, the combined cardiovascular endpoint of cardiovascular death, nonfatal myocardial infarction, stroke and hospitalization for ischemic heart disease was registered. Results: Most results were retested in 1045 hypertensive patients from a Paris cohort. Bland–Altman plot demonstrated a relative difference of −0.3% [95% confidence interval (CI) −15 to 17%] between ePWV and cfPWV. In Cox regression models in apparently healthy patients, ePWV and cfPWV (per SD) added independently to SCORE in prediction of combined endpoint [hazard ratio (95%CI) = 1.38(1.09–1.76) and hazard ratio (95%CI) = 1.18(1.01–1.38)] and to FRS [hazard ratio (95%CI) = 1.33(1.06–1.66) and hazard ratio (95%CI) = 1.16(0.99–1.37)]. If healthy patients with ePWV and/or cfPWV at least 10 m/s were reclassified to a higher SCORE risk category, net reclassification index was 10.8%, P less than 0.01. These results were reproduced in the Paris cohort. Conclusion: ePWV predicted major cardiovascular events independently of SCORE, FRS and cfPWV indicating that these traditional risk scores have underestimated the complicated impact of age and blood pressure on arterial stiffness and cardiovascular risk.

1 July 2018 in The Lancet Global Health
Verified
Journal Article
Open access
TBThomas Beaney
Thomas Beaney
Aletta SchutteAletta Schutte
Aletta Schutte
MTMaciej Tomaszewski
Maciej Tomaszewski
CACono Ariti
Cono Ariti
LBLouise M Burrell
Louise M Burrell
MSM Soares
M Soares
Increased blood pressure is the biggest contributor to the global burden of disease and mortality. Data suggest that less than half of the population with hypertension is aware of it. May Measurement Month was initiated to raise awareness of the importance of blood pressure and as a pragmatic interim solution to the shortfall in screening programmes. This cross-sectional survey included volunteer adults (≥18 years) who ideally had not had their blood pressures measured in the past year. Each participant had their blood pressure measured three times and received a a questionnaire about demographic, lifestyle, and environmental factors. The primary objective was to raise awareness of blood pressure, measured by number of countries involved, number of people screened, and number of people who have untreated or inadequately treated hypertension (defined as systolic blood pressure ≥140 mm Hg or diastolic blood pressure ≥90 mm Hg, or both, or on the basis of receiving antihypertensive medication). Multiple imputation was used to estimate the mean of the second and third blood pressure readings if these were not recorded. Measures of association were analysed using linear mixed models. Data were collected from 1 201 570 individuals in 80 countries. After imputation, of the 1 128 635 individuals for whom a mean of the second and third readings was available, 393 924 (34·9%) individuals had hypertension. 153 905 (17·3%) of 888 616 individuals who were not receiving antihypertensive treatment were hypertensive, and 105 456 (46·3%) of the 227 721 individuals receiving treatment did not have controlled blood pressure. Significant differences in adjusted blood pressures and hypertension prevalence were apparent between regions. Adjusted blood pressure was higher in association with antihypertensive medication, diabetes, cerebrovascular disease, smoking, and alcohol consumption. Blood pressure was higher when measured on the right arm than on the left arm, and blood pressure was highest on Saturdays. Inexpensive global screening of blood pressure is achievable using volunteers and convenience sampling. Pending the set-up of systematic surveillance systems worldwide, MMM will be repeated annually to raise awareness of blood pressure. International Society of Hypertension, Centers for Disease Control and Prevention, Servier Pharmaceutical Co.

1 May 2019 in European Heart Journal
Verified
Journal Article
Open access
PDF file
TBThomas Beaney
Thomas Beaney
LBLouise M Burrell
Louise M Burrell
RCRafael R Castillo
Rafael R Castillo
FCFadi Charchar
Fadi Charchar
SCSuzie Cro
Suzie Cro
NPNeil R Poulter
Neil R Poulter
Aims: Raised blood pressure (BP) is the biggest contributor to mortality and disease burden worldwide and fewer than half of those with hypertension are aware of it. May Measurement Month (MMM) is a global campaign set up in 2017, to raise awareness of high BP and as a pragmatic solution to a lack of formal screening worldwide. The 2018 campaign was expanded, aiming to include more participants and countries. Methods and results: Eighty-nine countries participated in MMM 2018. Volunteers (≥18 years) were recruited through opportunistic sampling at a variety of screening sites. Each participant had three BP measurements and completed a questionnaire on demographic, lifestyle, and environmental factors. Hypertension was defined as a systolic BP ≥140 mmHg or diastolic BP ≥90 mmHg, or taking antihypertensive medication. In total, 74.9% of screenees provided three BP readings. Multiple imputation using chained equations was used to impute missing readings. 1 504 963 individuals (mean age 45.3 years; 52.4% female) were screened. After multiple imputation, 502 079 (33.4%) individuals had hypertension, of whom 59.5% were aware of their diagnosis and 55.3% were taking antihypertensive medication. Of those on medication, 60.0% were controlled and of all hypertensives, 33.2% were controlled. We detected 224 285 individuals with untreated hypertension and 111 214 individuals with inadequately treated (systolic BP ≥ 140 mmHg or diastolic BP ≥ 90 mmHg) hypertension. Conclusion: May Measurement Month expanded significantly compared with 2017, including more participants in more countries. The campaign identified over 335 000 adults with untreated or inadequately treated hypertension. In the absence of systematic screening programmes, MMM was effective at raising awareness at least among these individuals at risk.

6 January 2019 in European Journal of Preventive Cardiology
Verified
Journal Article
Open access
Aletta SchutteAletta Schutte
Aletta Schutte
PGPhilimon N Gona
Philimon N Gona
CDChristian Delles
Christian Delles
AUAletta S Uys
Aletta S Uys
ABAdele Burger
Adele Burger
HHHugo W Huisman
Hugo W Huisman
Globally hypertension is stabilising, but in sub-Saharan Africa the incidence of hypertension remains on an increase. Although this might be attributed to poor healthcare and ineffective antihypertensive treatment, there is a limited understanding of population and individual-specific cardiovascular pathophysiology – necessary for effective prevention and treatment strategies in Africa. As there is a lack of longitudinal studies tracking the early pathophysiological development of hypertension in black populations, the African-PREDICT study was initiated. The purpose of this paper is to describe the detailed methodology and baseline cohort profile of the study. From 2013 to 2017, the study included 1202 black (N = 606) and white (N = 596) men and women (aged 20–30 years) from South Africa – screened to be healthy and clinic normotensive. At baseline, and each 5-year follow-up examination, detailed measures of health behaviours, cardiovascular profile and organ damage are taken. Also, comprehensive biological sampling for the ‘omics’ and biomarkers is performed. Overall, the baseline black and white cohort presented with similar ages, clinic and 24-hour blood pressures, but black adults had lower socioeconomic status and higher central systolic blood pressure than white individuals. The prospective African-PREDICT study in young black and white adults will contribute to a clear understanding of early cardiovascular disease development.

1 May 2020 in Arteriosclerosis, Thrombosis, and Vascular Biology
Verified
Journal Article
Closed access
PDF file
Aletta SchutteAletta Schutte
Aletta Schutte
Ruan KrugerRuan Kruger
Ruan Kruger
LGLebo F. Gafane-Matemane
Lebo F. Gafane-Matemane
YBYolandi Breet
Yolandi Breet
MSMichél Strauss-Kruger
Michél Strauss-Kruger
JCJ. Kennedy Cruickshank
J. Kennedy Cruickshank
Early vascular aging reflects increased arterial stiffness of central blood vessels at young chronological ages and powerfully predicts cardiovascular events and mortality, independent of routine brachial blood pressure and other risk factors. Since ethnic disparities exist in routine blood pressure, in hypertension and cardiovascular outcomes, this review evaluates major studies comparing arterial stiffness through the life course between different ethnic groups or races (which have no biological definition)—in children, adolescents, young, and middle-aged adults and the very elderly. Most report that compared with white European-origin samples, populations of black African descent have increased central arterial stiffness throughout different life stages, as well as a more rapid increase in arterial stiffness at young ages. Exceptions may include African Caribbean origin people in Europe. Differences in vascular structure and function are clearest, where obesity, socioeconomic, and psychosocial factors are most marked. Few studies evaluate a wider spectrum of ethnic groups or factors contributing to these ethnic disparities. Genetic effects are not obvious; maternal risk and intergenerational studies are scarce. Nevertheless, across all ethnic groups, for given levels of blood pressure and age, some people have stiffer central arteries than others. These individuals are most at risk of vascular events and mortality and, therefore, may benefit from early, as yet untested, preventive action and treatment.

1 August 2014 in Nutrition, Metabolism and Cardiovascular Diseases
Verified
Journal Article
Closed access
LWLisa Jayne Ware
Lisa Jayne Ware
KRK.L. Rennie
K.L. Rennie
SKSalome Kruger
Salome Kruger
IKIolanthé Marike Kruger
Iolanthé Marike Kruger
MGM. Greeff
M. Greeff
Aletta SchutteAletta Schutte
Aletta Schutte