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23 August 2022 | Story André Damons | Photo Supplied
Dr Walter Janse van Rensburg
Dr Walter Janse van Rensburg, Senior Lecturer in the Human Molecular Biology Unit, Department of Haematology and Cell Biology in the UFS School of Biomedical Sciences, says new research found that men of European descent over the age of 50 are the most vulnerable for the development of atherosclerosis.

A new study by researchers in the Human Molecular Biology Unit in the School of Biomedical Sciences at the University of the Free State (UFS) into atherosclerosis in the South African population found that men of European descent over the age of 50 are the most vulnerable for the development of atherosclerosis – the most common disorder associated with cardiovascular diseases (CVDs). Nearly half of men in this group had visible signs of atherosclerosis in the coronary arteries of the heart. 

This was in contrast to the only roughly one-tenth of the African-descent males and females in the same age bracket. More than a third of women of European descent over 50 had visible atherosclerosis in their coronary arteries. One hypothesis regarding a possible explanation for this discrepancy is based on the theory that socioeconomic status may be a driving force behind CVD.

Risks factor for cardiovascular diseases

Dr Walter Janse van Rensburg, Senior Lecturer in the Human Molecular Biology Unit at the School of Biomedical Sciences, UFS, and principal researcher, says the study was conceptualised during 2020s COVID-19 pandemic, due to reports of excessive blood clots associated with both acute COVID-19 infection and some of the SARS-CoV2 vaccines. However, limited data existed in our region regarding the other underlying causes for blood clot formation, such as atherosclerotic plaque rupture. The data was collected during a couple of months in 2021. The data was collected out of more than 10,000 case files spanning 10 years. The study is still ongoing.

“Atherosclerosis remains a major risk factor for CVD, and thus, believed to be a good indicator of the CVD profile in a population, yet little is known on its prevalence in sub-Saharan African populations. We aimed to determine the prevalence of atherosclerosis in a diverse South African population as found in post-mortem investigations. A retrospective file audit was done on 10,240 forensic post-mortem reports done at a forensic pathology mortuary in South Africa, over 10 years,” writes Dr Janse van Rensburg in the Abstract of the research article. 

According to him, cardiovascular diseases are reportedly the No 1 cause of mortality worldwide. According to the latest report from Stats SA, diseases of the circulatory system account for nearly a fifth of all deaths in South Africa.
“CVD is a multifactorial disorder, however, the presence of atherosclerosis (an inflammatory condition of artery walls) is the most common disorder associated with CVD. In order to assist in the prevention of the formation and progression of atherosclerosis, one can manage factors that have been associated with a higher risk for atherosclerosis, such as the use of tobacco, hypertension, elevated cholesterol, obesity, HIV infection and diabetes,” says Dr Janse van Rensburg.

Reasons behind different population’s mortality rate

It has been proposed, says Dr Janse van Rensburg, that socioeconomic status is possibly one of the essential roleplayers in CVD aetiology. The socioeconomic inequality in South Africa is well known, with an economic inequality Gini coefficient of 0.63 (the highest in the world). One study reported that in the Free State province, in the non-agricultural sector, the average household income for a European-descent household is roughly 4.35-times higher than the average African-descent household income. 

“Therefore, it is postulated that wealthier people, in the South African context, historically people of European descent, have the means to afford and adopt lifestyles that contribute to the increased risk of lifestyle diseases such as obesity, hypercholesterolaemia and diabetes, which are associated with a higher risk to develop CVD.

“We postulate that CVD-related deaths are traditionally lower among South Africans of African descent compared to the other ethnic populations due to the historical socioeconomic discrepancy between people of African descent and other population groups in higher-income countries.”

The study also found that the prevalence of CVDs and the incidence of premature CVD-related deaths are steadily increasing in both rural and urban communities and across the socioeconomic spectrum. The theory of epidemiological transition says that in populations with improved living conditions and better access to healthcare, the proportion of deaths caused by infectious diseases will decrease, and the proportion of deaths due to more chronic “man-made” lifestyle-related diseases, such as CVD, will increase.

However, our population’s socioeconomic status is not the only driving force behind CVD. Therefore, we theorise there has been an upward trend in South Africa across all regions to improve the access to better food and better healthcare, consequently resulting in an increase in CVD-related morbidity and mortality statistics.

“For all population groups, males are more affected than females within their demographic group. This may also be possibly attributed to the socioeconomic status and access to the healthcare gender-gap differential in the country.”

Studies are vital in raising public awareness

Dr Janse van Rensburg says that studies such as this are vital in raising public awareness regarding disorders associated with the lifestyle choices people make. However, a multidisciplinary approach is needed to ultimately create a lasting impact. 

“We hope that our findings will assist in identifying specific groups with a possible increased risk for CVD, and that we will inspire more focused research to identify potential high-risk behaviours within these groups that may eventually result in the enhancement of public health policies and awareness campaigns in our region.

“Recently, another article has been accepted for publication regarding the prevalence of excessive blood clots (thrombosis) as the underlying cause of death in our study cohort, further contributing to our understanding of the origins and contributory factors of CVDs in our region.”

News Archive

UFS first to mechanise agricultural technique
2006-05-09

    

Small farmers from Thaba `Nchu were the biggest group attending the farmers day at the UFS Paradys experimental farm.  From the left are Mr David Motlhale (a small farmer from Thaba 'Nchu), Prof Leon van Rensburg (lecturer at the UFS Department of Soil, Crop and Climate Sciences and project leader), Mr Nhlonipho Nhlabatsi (Agricultural Research Council, Glen), Ms Meisie Mthethwa (small farmer from Bloemspruit).  In front is Mr Patrick Molatodi (chairperson of the Tswelopele Small Farmer Association).
 

 

Some of the participants of the farmers day at the UFS Paradys experimental farm were from the left Prof Leon van Rensburg (lecturer at the UFS Department of Soil, Crop and Climate Sciences and project leader, Mr Patrick Molatodi (chairperson of the Tswelopele Small Farmers Association) and Prof Herman van Schalkwyk (Dean: UFS Faculty of Natural and Agricultural Sciences).

UFS first tertiary institution in world to mechanise agricultural technique
The University of the Free State (UFS) is the first tertiary institution in the world to mechanise the in-field rain water harvesting technique on a commercial scale.

The technique was recently demonstrated to about 100 small farmers at the UFS Paradys experimental farm outside Bloemfontein. 

“With this technique rain water is channeled to the plant and in this way food security is increased.  The advantage of the technique for commercial farmers lies in the reduced cultivation of land.  Small farmers will benefit from this because they can now move out into the fields and away from farming in their back yards,” says Prof Leon van Rensburg, lecturer at the UFS Department of Soil, Crop and Climate Sciences and project leader.    

Rain water harvesting is an antique concept that was used by communities before the birth of Christ.  In South Africa the technique is mainly used in the plots of small farmers where they make surface structures by hand. 

"The technique is also used for the first time by the UFS on commercial scale by means of the cultivation of a summer crop on 100 ha at the Paradys experimental farm,” says Prof Leon van Rensburg,

Of the farmers who attended the farmers day most represented about 42 rural communities in the vicinity of Thaba ‘Nchu.  A group of seven from KwaZulu-Natal also attended the proceedings.  These small farmers can for example apply this technique successfully on the 250-300 ha communal land that is available in the Thaba ‘Nchu area. 

The project is funded by the UFS and the National Research Foundation (NRF) and the farmers’ day was funded by the Water Research Commission.   

Media release
Issued by: Lacea Loader
Media Representative
Tel:   (051) 401-2584
Cell:  083 645 2454
E-mail:  loaderl.stg@mail.uovs.ac.za
9 May 2006

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