Effects of carvedilol on common carotid arterial flow, peripheral hemodynamics, and hemorheologic variables in

Y Nagakawa1, Y Akedo, S Kaku

  • 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.

Related Concept Videos

Adrenergic Antagonists: ɑ and β-Receptor Blockers01:31

Adrenergic Antagonists: ɑ and β-Receptor Blockers

Third-generation β-blockers, such as labetalol and carvedilol, represent a significant advancement in managing cardiovascular conditions. Unlike conventional β-blockers, which can induce peripheral vasoconstriction, third-generation drugs block α1 adrenoceptors. This promotes vasodilation through several mechanisms, such as increased nitric oxide production, inhibition of calcium ion entry, opening of potassium ion channels, and antioxidant action. Labetalol, for instance, is clinically...
Antihypertensive Drugs: Vasodilators01:23

Antihypertensive Drugs: Vasodilators

Vasodilators, primarily affecting the smooth muscles within arterial and venous walls, are commonly used for hypertension treatment. Medications such as minoxidil and hydralazine primarily target arteries and arterioles, while sodium nitroprusside acts on arterioles and venules. Minoxidil, functioning as a prodrug, is metabolized by hepatic sulfotransferase into its active form, minoxidil sulfate, after oral administration. This metabolite binds to the sulfonylurea receptor (SUR) component of...
Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
Heart Failure Drugs: Inhibitors of Renin-Angiotensin System01:26

Heart Failure Drugs: Inhibitors of Renin-Angiotensin System

The activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...
Heart Failure Drugs: β-Blockers01:22

Heart Failure Drugs: β-Blockers

β-adrenergic antagonists, commonly known as β-blockers, block the effects of sympathetic neurotransmitters such as noradrenaline (NA) and adrenaline (ADR). They have several beneficial effects in heart failure treatment. They reduce heart rate, the force of contraction, and cardiac muscle relaxation. They also slow the atrial-ventricular conduction rate and raise the threshold for arrhythmias. The concentration of β-blockers determines their effects on bronchodilation, vasodilation, and...
Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.