In the treatment of angina, the mechanism of action of a beta-adrenergic blocker is:
Decreased peripheral resistance.
Increased contractility and heart rate.
Relaxation of arterial and venous smooth muscle.
Slowed heart rate and decreased contractility of the heart.
The Correct Answer is D
A. Beta-adrenergic blockers primarily work by decreasing heart rate and contractility rather than directly affecting peripheral resistance.
B. Beta-adrenergic blockers decrease contractility and heart rate, rather than increasing them.
C. Relaxation of arterial and venous smooth muscle is typically associated with calcium channel blockers, not beta-adrenergic blockers.
D. Beta-adrenergic blockers slow the heart rate and reduce the force of contraction of the heart muscle, reducing myocardial oxygen demand and helping to relieve angina symptoms.
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Related Questions
Correct Answer is ["A","B","C"]
Explanation
A. Impulsiveness is a common symptom of ADHD, where children may act without thinking about the consequences.
B. Being easily distracted is another hallmark symptom of ADHD, where children may have difficulty sustaining attention on tasks or activities.
C. Excessive talking or difficulty remaining seated are also common symptoms of ADHD, reflecting hyperactive or impulsive behavior.
D. Violent behavior is not typically a primary symptom of ADHD and may suggest other behavioral or emotional issues.
Correct Answer is B
Explanation
Explanation:
A. Beta blockers are used to manage blood pressure and heart rate but are a different class.
B. Isosorbide is a nitrate, which is used primarily to treat and prevent episodes of angina by relaxing and widening blood vessels.
C. Calcium channel blockers also manage blood pressure and chest pain but act through a different mechanism.
D. Glycoprotein IIb/IIIa receptor antagonists are used to prevent platelet aggregation and are typically used in acute coronary syndrome, not as a long-term treatment for angina.
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