beta-blocker
Pronunciation: BAY-tuh BLAH-ker
A class of medications that reduce heart rate and blood pressure by blocking beta-adrenergic receptors, commonly prescribed post-cardiac event.
Full Definition
Beta-blockers are a class of cardiovascular medications that work by blocking beta-adrenergic receptors in the heart and blood vessels, resulting in decreased heart rate, reduced blood pressure, and lower myocardial oxygen demand. These medications are frequently prescribed following cardiac events such as myocardial infarction or for conditions like hypertension and heart failure. In cardiac rehabilitation settings, beta-blocker therapy significantly impacts exercise prescription and heart rate targets, as patients on these medications will have blunted heart rate responses to exercise. Exercise professionals must adjust intensity parameters accordingly and often rely more heavily on perceived exertion scales.
Usage
Usage note: Note that beta-blocker affects exercise heart rate response and must be considered in exercise prescription.
In Context
- "Patients on beta-blocker therapy require modified heart rate targets during exercise testing." — Exercise protocol guidelines
- "The beta-blocker dosage was titrated upward following the patient's recent medication review." — Progress note