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A Methodological Approach to Non-invasive Assessments of Vascular Function and Morphology
Published on: February 7, 2015
Effects of carvedilol on common carotid arterial flow, peripheral hemodynamics, and hemorheologic variables in
1Department of Geriatrics, Faculty of Medicine, University of Tokyo, Japan.
Insights
Carvedilol, a beta-blocker, improved blood flow and reduced blood thickness in elderly hypertension patients. These hemorheologic improvements may help prevent thrombosis and atherosclerosis.
Area of Science:
- Cardiovascular Medicine
- Geriatrics
- Pharmacology
Background:
- Essential hypertension is a common condition in geriatric patients.
- Peripheral hemodynamics and hemorheologic factors play a crucial role in cardiovascular health.
- Beta-blockers are widely used for hypertension management, but their specific effects on hemorheology in the elderly require further investigation.
Purpose of the Study:
- To evaluate the effects of carvedilol on peripheral hemodynamics and hemorheologic parameters in geriatric patients with essential hypertension.
Main Methods:
- 11 geriatric patients with essential hypertension received carvedilol (10 or 20 mg daily) for 8 weeks.
- Peripheral hemodynamics were assessed using venous occlusion plethysmography.
- Common carotid arterial flow was measured via pulsed Doppler.
- Hemorheologic parameters, including erythrocyte aggregation, deformability, plasma viscosity, hematocrit, and platelet function, were analyzed.
Main Results:
- Carvedilol significantly decreased systolic and diastolic blood pressure.
- Common carotid arterial flow and peripheral hemodynamics were improved.
- Erythrocyte aggregation and plasma viscosity decreased, while erythrocyte deformability increased.
- Levels of circulating platelet aggregates were also improved.
Conclusions:
- Carvedilol demonstrates beneficial effects on peripheral hemodynamics and hemorheologic parameters in elderly patients with essential hypertension.
- These improvements may contribute to the prevention of thrombosis and atherosclerosis initiation and progression.
- Carvedilol represents a potential therapeutic option for managing cardiovascular risk in this population.
Abstract:
The effects of a beta-blocker, carvedilol, on peripheral hemodynamics and hemorheologic parameters were evaluated in 11 geriatric patients with essential hypertension [3 men and 8 women aged 62-79 years (mean, 68.6 years)]. Carvedilol was given orally after breakfast at a dose of 10 or 20 mg daily for 8 weeks. Peripheral hemodynamics, the common carotid arterial flow, and hemorheologic parameters were determined twice prior to administration and after 4 and 8 weeks of carvedilol treatment. The common carotid arterial flow was determined using the pulsed Doppler method. Peripheral hemodynamics were assessed by venous occlusion plethysmography. The hemorheologic parameters assessed include erythrocyte aggregation, erythrocyte deformability, plasma viscosity, whole-blood hematocrit, and platelet function tests. Erythrocyte aggregation was measured using an Erythrocyte Aggregometer MA-1 (Myrenne, USA), taking a high shear rate of 600 s-1 and a low shear rate of 3 s-1 as the indices. Statistical comparisons of values before and after carvedilol administration were made using the paired Student's t-test. Systolic and diastolic blood pressure were decreased by carvedilol. The common carotid arterial flow was increased, and peripheral hemodynamics were improved by carvedilol. Erythrocyte aggregation (measured at both a high and a low shear rate) and plasma viscosity were decreased, erythrocyte deformability was increased, and levels of circulating platelet aggregates were also improved by carvedilol. This improvement of hemorheologic variables may contribute to prevention of the initiation and progression of thrombosis and atherosclerosis in geriatric patients with essential hypertension.
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