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Baroreceptor function in the hypertensive black African
Insights
African hypertensive patients exhibit reduced baroreceptor reflex sensitivity (BRS), similar to European patients. This finding is crucial for understanding hypertension management in diverse populations.
Area of Science:
- Cardiology
- Hypertension Research
- Neurocardiology
Background:
- Hypertension in Black Africans presents differently than in White Europeans, with fewer atherosclerosis complications and less response to beta-blockers.
- Baroreceptor reflex sensitivity (BRS) differences between African and White hypertensive patients are not well-established.
- Understanding BRS is vital for effective hypertension treatment strategies.
Purpose of the Study:
- To assess baroreceptor reflex sensitivity (BRS) in African hypertensive patients.
- To compare BRS in African hypertensives with predicted values for European hypertensives.
- To investigate potential ethnic differences in baroreceptor function in hypertension.
Main Methods:
- Phenylephrine method used to measure BRS in 19 African hypertensive patients in The Gambia.
- BRS results compared to predicted values for White patients based on age and blood pressure.
- Regression analysis used for comparison with data from 61 hypertensive patients in Oxford.
Main Results:
- Baroreceptor reflex sensitivity was found to be reduced in the studied African hypertensive patients.
- The mean BRS in African hypertensives was similar to the predicted BRS for European patients of comparable age and blood pressure.
- Resting mean arterial pressure in African patients ranged from 117 to 194 mmHg.
Conclusions:
- African hypertensive patients demonstrate a depression in baroreflex sensitivity.
- The degree of baroreflex sensitivity depression appears comparable between African and European hypertensive patients.
- Findings suggest similar baroreceptor dysfunction in hypertensive individuals across different ethnic groups, impacting treatment considerations.
Abstract:
Hypertension in the black African differs in some respects from white Europeans: complications due to accelerated atherosclerosis are rare and treatment with beta-blockers alone is ineffective. It is not known if baroreceptor function is depressed in African hypertensives to the same extent as it is in whites. Therefore, we have assessed baroreceptor reflex sensitivity (BRS) by the phenylephrine method in 19 African hypertensive patients living in the Gambia, West Africa. The results were compared to predicted BRS values for white patients of the same age and blood pressure calculated from a regression equation derived from 61 hypertensive patients studied in Oxford. It was found that baroreceptor reflex sensitivity was reduced in the African hypertensives and the log mean BRS was similar to the predicted value for Europeans of the same age and level of blood pressure (0.473 +/- 0.24 msec/mmHg and 0.489 +/- 0.21 msec/mmHg respectively). The resting mean arterial pressure in the African patients varied from 117 to 194 mmHg. The results indicated that African hypertensives have a depression of baroreflex sensitivity which is similar to European hypertensive patients.