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Risk factor profiles for atherosclerotic cardiovascular disease in black and other Africans with established
Ahmed Solomon1, Berenice F Christian, Gavin R Norton
1Department of Rheumatology, University of the Witwatersrand and Charlotte Maxeke Johannesburg Academic Hospital, Johannesburg, South Africa.
Insights
Black Africans with rheumatoid arthritis (RA) do not show reduced atherosclerotic cardiovascular disease (CVD) risk. Cardiovascular disease risk assessment in RA patients should not depend on ethnic origin.
Area of Science:
- Rheumatology and Cardiovascular Medicine
- Epidemiology of Chronic Diseases
Background:
- Black Africans are perceived to have a lower risk of atherosclerotic cardiovascular disease (CVD).
- This study examines whether this protective effect extends to Black Africans with rheumatoid arthritis (RA).
Purpose of the Study:
- To investigate atherosclerotic cardiovascular disease (CVD) risk factor profiles and arterial stiffness in Black Africans with rheumatoid arthritis (RA).
- To compare CVD risk between Black Africans and other ethnic groups with RA.
Main Methods:
- Multivariable regression models were used to analyze CVD risk factors and arterial stiffness.
- Risk factors included conventional (hypertension, dyslipidemia, smoking, diabetes, metabolic syndrome) and nonconventional (rheumatoid factor, inflammation markers) measures.
- Arterial stiffness was assessed using brachial pulse pressure.
Main Results:
- Black Africans with RA had higher rates of hypertension and diabetes but lower smoking rates.
- Despite differences in individual risk factors, overall CVD risk scores and metabolic syndrome prevalence were similar between ethnic groups.
- Black ethnicity was not independently associated with inflammation markers or arterial stiffness.
Conclusions:
- Black patients with RA do not exhibit reduced overall atherosclerotic CVD risk or arterial stiffness compared to other ethnic groups.
- Cardiovascular disease risk management in RA should be individualized, irrespective of ethnicity or epidemiological transition stage.
Objective:
Black Africans reportedly experience a distinctly low risk for atherosclerotic cardiovascular disease (CVD). We investigated whether this protection was present among Africans with established rheumatoid arthritis (RA).
Methods:
We determined disparities in CVD risk factor profiles (major conventional: hypertension, dyslipidemia, smoking, and diabetes; other conventional: underweight, obesity, metabolic syndrome, chronic kidney disease, alcohol consumption, tension, depression, and body height; nonconventional: rheumatoid factor status and markers of inflammation) and arterial stiffness (brachial pulse pressure) between 291 black and 335 other (229 white, 64 Asian, and 42 mixed ancestry) consecutive Africans with RA in multivariable regression models.
Results:
After adjusting for demographic characteristics and healthcare sector attendance, black Africans had more prevalent hypertension (OR 1.76, p = 0.01) and diabetes (OR 1.90, p = 0.07), smoked less frequently (OR 0.12, p < 0.0001), and had concurrent lower total and high-density lipoprotein cholesterol concentrations that resulted in unaltered atherogenic indices (p = 0.2) than the other participants in the study. These findings translated into global scores for major conventional risk factor-mediated future CVD event rates that were not reduced in black patients. Proportions of individual metabolic syndrome components differed between black and other patients but their total numbers of metabolic risk factors (p = 0.4) and metabolic syndrome frequencies (OR 1.44, p = 0.1) were similar. Black ethnicity did not independently associate with rheumatoid factor status, markers of inflammation, and brachial pulse pressures.
Conclusion:
The overall conventional and nonconventional atherosclerotic CVD risk burdens and arterial stiffness were not reduced in black patients with RA. CVD risk should be assessed and managed independent of ethnic origin and epidemiological transition stage in RA.
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