β-Adrenergic Receptor Blockers

β-Adrenergic Receptor Blockers

β-Adrenergic receptor blockers, commonly known as β-blockers, are essential cardiovascular agents that inhibit β1- or β2-receptors to reduce heart rate, myocardial contractility, and overall cardiac workload. They are used in hypertension, angina, arrhythmias, heart failure, myocardial infarction, and anxiety-associated tachycardia. By suppressing adrenergic stimulation, β-blockers improve myocardial oxygen efficiency, prevent arrhythmic events, and reduce mortality in post-MI and chronic heart failure patients. Selective β1-blockers provide cardiac-specific effects, while nonselective drugs also influence bronchial and vascular receptors. Despite their efficacy, β-blockers require careful use in patients with asthma, bradycardia, or peripheral vascular disease. They remain fundamental in long-term cardiovascular protection.

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