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Cardiac hypertrophy and arterial distensibility in essential hypertension
Insights
Essential hypertension increases cardiac hypertrophy markers and arterial stiffness. Arterial distensibility impacts cardiac hypertrophy, and antihypertensive drugs may affect arterial properties differently.
Area of Science:
- Cardiology
- Vascular Physiology
- Hypertension Research
Background:
- Sustained essential hypertension is linked to structural and functional cardiovascular changes.
- Assessing arterial stiffness and cardiac remodeling is crucial for understanding hypertension's impact.
Purpose of the Study:
- To compare echocardiographic and vascular parameters in hypertensive patients versus controls.
- To investigate correlations between cardiac remodeling, arterial stiffness, and blood pressure.
- To evaluate the effects of different antihypertensive agents on arterial distensibility.
Main Methods:
- Echocardiography was used to measure left ventricular mass-volume ratio (M/V).
- Pulsed Doppler and Bramwell-Hill equation derived left ventricular end-systolic stress (ESS), carotid-femoral pulse wave velocity (PWV), and brachial artery compliance (BAC).
- Comparison between 20 hypertensive patients and 20 age/sex-matched controls, with analysis of drug effects.
Main Results:
- Hypertensive patients showed significantly increased M/V ratio, ESS, and PWV, and reduced BAC compared to controls.
- ESS correlated positively with PWV (r=0.73), and M/V ratio correlated with PWV (r=0.60) and BAC (r=-0.70).
- Nitrendipine decreased PWV, while cadralazine did not, despite similar blood pressure reduction.
Conclusions:
- Arterial distensibility is a key factor in maintaining cardiac hypertrophy in hypertension.
- Antihypertensive medications can differentially affect arterial distensibility, influencing cardiac remodeling.
- Understanding these mechanisms may lead to improved therapeutic strategies for hypertension and cardiac hypertrophy.
Abstract:
Echocardiographic determinations, left ventricular mass-volume ratio (M/V), left ventricular end-systolic stress (ESS), carotidofemoral pulse wave velocity (PWV), and brachial artery compliance (BAC), deduced from pulsed Doppler measurements and from the Bramwell-Hill equation, were evaluated in 20 patients with sustained essential hypertension in comparison with 20 control subjects of the same age and sex. In hypertensive patients, M/V ratio, ESS, and PWV were significantly increased while BAC was reduced. In the overall population, ESS was directly correlated with PWV (r = 0.73), and M/V ratio was significantly correlated with PWV (r = 0.60), BAC (r = -0.70), and systolic arterial pressure (r = 0.71). No comparable results were observed with diastolic arterial pressure. PWV was unchanged after cadralazine, a dihydralazine-like substance, and was decreased with the same blood pressure reduction following nitrendipine, a new calcium-blocking agent. These results suggest that: (1) the distensibility of large arteries plays an important role in the maintenance of cardiac hypertrophy in hypertension, and (2) antihypertensive drugs may act differently on arterial distensibility with possible consequences on ESS and reversion of left ventricular hypertrophy.