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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...
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...
Adrenergic Antagonists: Chemistry and Classification of β-Receptor Blockers01:25

Adrenergic Antagonists: Chemistry and Classification of β-Receptor Blockers

β-adrenergic antagonists, or β-blockers, modulate the sympathetic nervous system by targeting β-adrenoceptors and inhibiting catecholamine-mediated sympathetic responses. β-blockers differ in their adrenoceptor subtype affinity, lipophilicity, and α-blocking capabilities. The history of β-blocker development began with the prototype, dichloroisoprenaline, which exhibited partial agonist activity. As a result, propranolol was developed as a pure antagonist but nonselective agent, paving the way...
Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers01:24

Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers

Adrenergic stimulation generally impacts cardiac rate and rhythm. Specifically, stimulation of the β-adrenoceptors triggers an increase in intracellular calcium ion influx and pacemaker currents, which may cause arrhythmias. Catecholamines like adrenaline also demonstrate β2-adrenoceptor-mediated hypokalemia, impacting cardiac action potential and disrupting the normal cardiac rhythm. Class II antiarrhythmic drugs are β-adrenoceptor antagonists or β-blockers, which indirectly block calcium...
Antihypertensive Drugs: Types of β-Blockers01:28

Antihypertensive Drugs: Types of β-Blockers

β receptors are classified into three subclasses: β1, β2, and β3. β1 receptors are primarily located in the heart and kidneys. When they get activated, they increase heart rate, contractility, and renin release. This process enhances blood pressure and aids in stress management. In contrast, β2 receptors are situated mainly in the lungs, blood vessels, and skeletal muscles. Upon activation, they trigger smooth muscle relaxation, causing bronchodilation and vasodilation. This widens airways and...
Adrenergic Antagonists: Pharmacological Actions of β-Receptor Blockers01:27

Adrenergic Antagonists: Pharmacological Actions of β-Receptor Blockers

β-receptor blockers significantly impact the cardiovascular system by counteracting catecholamine-induced sympathetic responses. These medications decrease heart rate, contractility, and cardiac output, potentially leading to cardiac depression, life-threatening bradycardia, and death. Therapeutically, β-blockers function as mild antihypertensives and are utilized in treating angina pectoris and cardiac arrhythmias. However, nonselective β-blockers inhibit β2-receptors in bronchial smooth...

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Related Experiment Videos

Nebivolol: third-generation beta-blockade.

Rudolf A de Boer1, Adriaan A Voors, Dirk J van Veldhuisen

  • 1University Medical Center Groningen, Thoraxcenter, Department of Cardiology, Groningen, The Netherlands.

Expert Opinion on Pharmacotherapy
|July 31, 2007
PubMed
Summary

Nebivolol, a selective beta-blocker, effectively treats hypertension and heart failure. It offers vasodilating and antioxidant benefits, improving patient outcomes in clinical trials.

Area of Science:

  • Pharmacology
  • Cardiology

Background:

  • Nebivolol is a third-generation beta-blocker with high beta1-adrenoceptor selectivity.
  • It possesses unique nitric oxide-mediated vasodilating and antioxidant properties.
  • Nebivolol demonstrates a favorable metabolic profile and good tolerability in patients with hypertension and heart failure.

Purpose of the Study:

  • To review experimental and clinical data on nebivolol.
  • To highlight its efficacy and safety in managing hypertension and heart failure.
  • To discuss its vasodilating and antioxidant effects.

Main Methods:

  • Review of existing experimental and clinical studies.
  • Analysis of data from smaller trials in hypertensive patients.
  • Examination of results from a large mortality/morbidity trial in heart failure patients.

Related Experiment Videos

Main Results:

  • Nebivolol is well-tolerated in patients with hypertension and heart failure.
  • A large trial demonstrated nebivolol's ability to reduce mortality and hospitalizations in heart failure.
  • While smaller studies exist for hypertension, large-scale trials on hard endpoints are limited.

Conclusions:

  • Nebivolol is approved for mild-to-moderate hypertension and heart failure in Europe.
  • It is registered for hypertension outside Europe.
  • The drug's selective beta-blockade, vasodilating, and antioxidant properties contribute to its therapeutic benefits.