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Related Concept Videos

Heart Failure Drugs: β-Blockers01:22

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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,...
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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...
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Adrenergic Antagonists: Pharmacological Actions of β-Receptor Blockers01:27

Adrenergic Antagonists: Pharmacological Actions of β-Receptor Blockers

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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...
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Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers01:24

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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...
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Antihypertensive Drugs: Types of β-Blockers01:28

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

Adrenergic Antagonists: Chemistry and Classification of β-Receptor Blockers

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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...
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Related Experiment Video

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The WATCHMAN Left Atrial Appendage Closure Device for Atrial Fibrillation
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Beta-blockers for preventing stroke recurrence.

Luiz Gustavo De Lima1, Humberto Saconato, Alvaro N Atallah

  • 1Brazilian Cochrane Centre, Universidade Federal de São Paulo, Rua Pedro de Toledo 598, São Paulo, São Paulo, Brazil, 04039-001.

The Cochrane Database of Systematic Reviews
|October 16, 2014
PubMed
Summary
This summary is machine-generated.

Beta-blockers do not effectively prevent stroke recurrence or reduce major vascular events in patients with a history of stroke or TIA. Increased adverse events were observed, suggesting caution in their use for secondary stroke prevention.

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Area of Science:

  • Neurology
  • Cardiology
  • Clinical Pharmacology

Background:

  • Stroke impacts 15 million globally, necessitating effective secondary prevention strategies.
  • Beta-blockers are considered for stroke prevention due to their blood pressure-lowering and potential additional effects.
  • Secondary prevention is crucial given stroke's high recurrence rate.

Purpose of the Study:

  • To assess beta-blocker efficacy in preventing stroke recurrence, death, and major vascular events post-stroke or TIA.
  • To evaluate the safety of beta-blockers, specifically concerning new-onset diabetes mellitus.

Main Methods:

  • Systematic review and meta-analysis of randomized controlled trials (RCTs).
  • Searched multiple databases including Cochrane, MEDLINE, EMBASE, and LILACS up to May 2014.
  • Included RCTs comparing beta-blockers with placebo or other treatments in patients with prior stroke or TIA.

Main Results:

  • Two high-quality RCTs with 2193 participants were included.
  • No significant difference in fatal/non-fatal stroke risk (RR 0.94, 95% CI 0.76-1.18) or major vascular events.
  • Beta-blocker use (atenolol) led to more frequent adverse events (RR 1.85, 95% CI 1.45-2.35), a common reason for discontinuation.

Conclusions:

  • Current evidence does not support the routine use of beta-blockers for secondary stroke or TIA prevention.
  • Larger studies are required to definitively establish the role of beta-blockers in this patient population.
  • Safety concerns, particularly increased adverse events, warrant careful consideration.