Related Experiment Video
Updated: Jun 28, 2025
10:05
Testing the Efficacy of Pharmacological Agents in a Pericardial Target Delivery Model in the Swine
Published on: July 7, 2016
8.3K
Beta Blockers in Contemporary Cardiology: Is It Better to Cast Them Out?
Javaid Ahmad Dar1, John Roshan Jacob2
1Department of Cardiology, Christian Medical College, Vellore, India. javaid985@gmail.com.
Korean Circulation Journal
|April 24, 2024
Summary
Beta blockers, while beneficial for heart failure with reduced ejection fraction (HFrEF), may be overused. Current data suggests potential harm, including increased stroke risk and reduced exercise capacity, in other cardiovascular conditions.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Beta blockers are widely prescribed for cardiovascular conditions, including hypertension, coronary artery disease (CAD), and heart failure (HF).
- Their established efficacy in heart failure with reduced ejection fraction (HFrEF) has led to broad clinical application.
Purpose of the Study:
- To critically review the current indications and clinical utility of beta blockers.
- To evaluate the potential risks versus benefits of beta blocker use in various cardiovascular diseases beyond HFrEF.
Main Methods:
- Systematic review of existing data and clinical evidence regarding beta blocker use.
- Critical analysis of studies investigating beta blockers in hypertension, heart failure with preserved ejection fraction (HFpEF), stable CAD, and atrial fibrillation (AF).
Main Results:
- Beta blockers are associated with increased stroke risk and atrial fibrillation (AF) in hypertensive patients.
- In HFpEF, beta blockers have been linked to decreased exercise capacity.
- No mortality benefit is observed with beta blockers in stable CAD or myocardial infarction with normal systolic function.
Conclusions:
- Beta blockers may be over-prescribed in conditions such as HFpEF, stable CAD, and hypertension.
- The benefits observed in HFrEF may not translate to other cardiovascular conditions, potentially causing more harm than good.
Related Concept Videos
01:31Adrenergic Antagonists: ɑ and β-Receptor Blockers
442
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...
442
01:27Adrenergic Antagonists: Pharmacological Actions of β-Receptor Blockers
783
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...
783
01:22Heart Failure Drugs: β-Blockers
337
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,...
337
01:25Adrenergic Antagonists: Chemistry and Classification of β-Receptor Blockers
592
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...
592
01:28Antihypertensive Drugs: Types of β-Blockers
657
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...
657
01:24Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers
741
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...
741